Money & Everyday
Discount, tip and bill-splitting calculators, electricity, fuel and EV charging costs – quick answers for everyday life.
From the discount calculator to the gas cost calculator and the EV charging cost calculator: everyday calculators that run in your browser, no sign-up needed.
250 tools
Most used
- kg to lbs converterConvert kg to lbs and back: 1 kg = 2.2046 lb. Shows pounds and ounces, stone and pounds, grams, tons and a kg to lbs chart – exact to the legal definition.
- mm to inches and inches to mm convertermm to inches: 1 inch = 25.4 mm exactly. Type millimeters for decimal inches and the nearest 1/64 fraction, or go back from inches to mm, with the working.
- cm to inches convertercm to inches: divide by 2.54, so 1 cm = 0.3937 in. Type cm for decimal inches and the nearest 1/16 fraction, or go back to cm, with a chart of everyday sizes.
- Celsius to Fahrenheit converterCelsius to Fahrenheit: 100 °C = 212 °F. Type a temperature and get °F at once – with the formula worked out, a double-and-add-30 shortcut and a chart.
- lbs to kg converterlbs to kg: multiply pounds by 0.45359237, so 150 lb = 68.039 kg. Type pounds for kg, stone and pounds-ounces, or go back to lbs, with plates and bag limits.
- Inches to feet and feet to inches converterInches to feet: divide by 12, so 72 in = 6 ft. Type inches for decimal feet and feet-and-inches (80 in = 6 ft 8 in), or go back to inches, with a chart.
- Meters to feet converterMeters to feet: 1 m = 3.281 ft. Type meters to get feet and inches at once, or go back from feet to meters – with the working, a quick mental trick and a chart.
- cm to feet and inches (height converter)cm to feet: divide by 30.48, so 175 cm = 5.741 ft. Type cm for decimal feet and feet and inches (5 ft 8.9 in), or go back to cm, with a height chart.
All tools
- Fahrenheit to Celsius converterConvert Fahrenheit to Celsius and back: °C = (°F − 32) ÷ 1.8. Also Kelvin, Rankine and Réaumur, with the working shown and a chart of common temperatures.
- Inches to cm converterConvert inches to cm and cm to inches: 1 in = 2.54 cm. Includes fractions to 1/16″, feet and inches for height, and TV or monitor width and height.
- km to miles and miles to km converterkm to miles: multiply by 0.621371, so 10 km = 6.214 mi. Type kilometers for miles, or miles for km, with the working and 5K to marathon distances.
- EST to IST time converter (New York to India)EST to IST: India is 10 h 30 min ahead of New York in winter, 9 h 30 min in summer. Enter a time and date for the exact IST, with live clocks and a day table.
- oz to ml and ml to oz converter (fluid ounces)oz to ml: 1 US fluid ounce = 29.5735 mL, 1 UK fluid ounce = 28.4131 mL. Type ounces for milliliters or ml for ounces, with cups, tablespoons and the UK value.
- Inflation calculator – value of a dollar over timeInflation calculator with official BLS CPI annual averages 1913–2025: what a dollar amount is worth in another year, plus total and average inflation per year.
- CST to EST time converter (Central to Eastern)CST to EST: Eastern Time is 1 hour ahead of Central Time. Enter a time and date to convert Chicago to New York, with live clocks, market hours and a day table.
- PST to EST and EST to PST time converterPST to EST: add 3 hours; EST to PST: subtract 3 hours. Enter a time and date to convert Los Angeles and New York, with live clocks and a full-day table.
- To-do list online (tasks and checklist)To-do list online without an account: add tasks with Enter, tick them off, drag to sort, due dates, several lists, print and backup. Stays on your device.
- Salary CalculatorSalary calculator: enter pay per hour, day, week, month or year plus your working hours and see the same gross pay for every other period – with the working.
- Concrete CalculatorConcrete calculator for slabs, footings, post holes, tubes and stairs: cubic yards with waste, weight, cost and how many 40, 60 or 80 lb bags you need.
- Liters to gallons converterConvert liters to gallons and back: 1 liter = 0.2642 US gallons. Also UK gallons, pints, cups, cubic meters and barrels – with the working and a table.
- Minutes to hours converter (and hours to minutes)Minutes to hours: divide by 60, so 90 min = 1.5 h. Type minutes for decimal hours and hours-and-minutes, or go back to minutes, with a timesheet chart.
- UTC to EST time converterUTC to EST: subtract 5 hours in winter (EST) and 4 hours in summer (EDT). Enter a UTC time and date for New York time, with live clocks and a full-day table.
- Tire size calculator and comparisonTire size calculator for 205/55R16 or 31x10.50R15: diameter, circumference, revs per mile, speedometer error and equivalent sizes within 3 %.
- Celsius to kelvin and kelvin to Celsius converterCelsius to kelvin: add 273.15, so 25 °C = 298.15 K. Type °C for kelvin, Fahrenheit and Rankine, or go back from kelvin, with absolute zero and a chart.
- Bar to psi converterConvert bar to psi and back: 1 bar = 14.504 psi. Also pascal, kPa, atm, mmHg and water column – with the working, a chart and a note on psig vs psia.
- Time Difference Between Two CountriesTime difference between two cities or countries: the gap now and on any date, the day daylight saving changes it, an hour-by-hour table and arrival times.
- Acres to square feet converterAcres to square feet: 1 acre = 43,560 sq ft. Enter acres to get square feet at once, or go back from sq ft to acres – with m², hectares and lot-size examples.
- Nm to ft lbs: torque converterConvert Nm to ft lbs, lbf·in, kgf·m, kgf·cm and more: all torque units at a glance, a chart for torque wrench settings and power from rpm. Free.
- Grams to oz and oz to grams converterGrams to oz: divide by 28.349523125, so 100 g = 3.527 oz. Type grams for ounces plus pounds and troy ounces, or go back from oz to grams, with the working.
- Inches to meters and meters to inches converterInches to meters: multiply by 0.0254, so 80 in = 2.032 m. Type inches for meters, centimeters and feet, or go back from meters to inches, with the working.
- Feet to miles and miles to feet converterFeet to miles: divide by 5,280, so 10,000 ft = 1.894 mi. Type feet for miles (with yards and km), or miles for feet, with altitudes and distances to compare.
- KB to MB and MB to KB converter, 1000 or 1024KB to MB: divide by 1,000, so 2,500 kB = 2.5 MB; switch to 1,024 for KiB to MiB (2.441). Type kilobytes for megabytes or go back, with a file-size chart.
- Knots to mph and mph to knots converterKnots to mph: multiply by 1.1508, so 10 kn = 11.508 mph. Type knots for mph, km/h and m/s, or go back from mph to knots, with Beaufort and hurricane speeds.
- Square Footage CalculatorSquare footage calculator for rooms and whole homes: enter feet and inches or metres, add rooms and L-shapes, get sq ft, m², sq yd, acres, waste and cost.
- Hours to days and days to hours converterHours to days: divide by 24, so 100 h = 4.167 days (4 days 4 hours). Type hours for days, days plus hours and 8-hour workdays, or go back from days to hours.
- km/h to mph converterConvert km/h (kph) to mph and back: 100 km/h = 62.14 mph, 160 km/h = 99.42 mph, 200 km/h = 124.27 mph. Also m/s and knots, with a full conversion chart.
- Liters to quarts and quarts to liters converterLiters to quarts: divide by 0.946352946, so 2 L = 2.1134 US quarts (1.7598 UK). Choose US or UK, type liters for quarts or quarts for liters, with a chart.
- lbs to oz and oz to lbs converterlbs to oz: multiply by 16, so 1 lb = 16 oz. Type pounds for ounces and the lb + oz form (7.5 lb = 7 lb 8 oz), or ounces for pounds, with a chart.
- MB to GB converterConvert MB to GB and back: 1 GB = 1,000 MB, 1 GiB = 1,024 MiB. Also bits, bytes, TB, Mbit and download time – with the working and a conversion table.
- Discount calculatorPercent off calculator: sale price and savings for any discount, stacked discounts like 20% + 10%, the percent off between two prices and the original price.
- mm to feet and feet to mm convertermm to feet: divide by 304.8, so 2,400 mm = 7.874 ft. Type millimeters for feet and for feet-and-inches, or go back from feet to mm, with sheet-size examples.
- oz to cups and cups to oz converteroz to cups: 8 fluid ounces = 1 US cup, but 8 oz of flour is 1.814 cups. Choose liquid or an ingredient, type ounces and get cups and the nearest cup fraction.
- Yards to feet and feet to yards converterYards to feet: multiply by 3, so 100 yd = 300 ft. Type yards for feet (with inches and meters), or feet for yards, plus factors 9 and 27 for area and volume.
- lbs to grams and grams to lbs converterlbs to grams: multiply by 453.59237, so 1 lb = 453.592 g exactly. Type pounds for grams (with kg and oz) or grams for pounds, plus a chart of 454 g packs.
- Tip calculator and bill splitterTip calculator: an 18% tip on $80 is $14.40, so 4 people pay $23.60 each. Split any bill, round up each share or the total to 1, 5 or 10 and see your real rate.
- Hourly to salary calculatorConvert an hourly wage to annual salary or salary to hourly pay – plus daily, weekly and monthly amounts. Gross pay, any hours per week, any currency.
- kPa to psi and psi to kPa converterkPa to psi: divide by 6.894757, so 220 kPa = 31.908 psi. Type kilopascals for psi (with bar and atm), or psi for kPa, with a tire-pressure chart.
- Quiz maker: create a quiz and share it by linkMake your own quiz with multiple-choice and true-or-false questions, play it with a score and share it by link – free, no sign-up, no server.
- Meters to yards and yards to meters converterMeters to yards: divide by 0.9144, so 100 m = 109.361 yd. Type meters for yards (with feet and inches) or yards for meters, with sports distances to compare.
- kW to hp converterkW to hp: 100 kW = 134.1 hp (mechanical). Enter kilowatts and get horsepower at once, or hp to kW – with metric PS shown too, the formula and a quick chart.
- Budget Planner Using the 50/30/20 RuleBudget planner using the 50/30/20 rule: enter your take-home pay, see needs, wants and savings per month and week, and compare them with your actual spending.
- Grams to kg and kg to grams converterGrams to kg: divide by 1000, so 2,500 g = 2.5 kg. Type grams for kilograms or kilograms for grams, with pounds and ounces below and a chart.
- Fahrenheit to kelvin and kelvin to Fahrenheit converterFahrenheit to kelvin: add 459.67, multiply by 5/9, so 68 °F = 293.15 K. Type °F for kelvin, °C and Rankine, or go back from K to °F, with a chart and working.
- Quarts to gallons and gallons to quarts converterQuarts to gallons: divide by 4, so 10 qt = 2.5 gal. Type quarts for gallons plus pints, cups, ounces and liters, or go back from gallons, with a gallon ladder.
- Miles to meters and meters to miles converterMiles to meters: multiply by 1,609.344, so 3 mi = 4,828.032 m. Type miles for meters, km and feet, or meters for miles, with track and race distances.
- Tablespoons to cups and cups to tablespoons converterTablespoons to cups: divide by 16, so 4 tbsp = 1/4 cup. Pick US, metric or Australian spoons, type tablespoons and get cups and the nearest cup fraction.
- Tap drill size for metric threadsTap drill size for metric threads M2 to M36: look up the drill for coarse and fine threads, for cutting and forming taps, with minor diameters and a chart.
- Minutes to seconds and seconds to minutes converterMinutes to seconds: multiply by 60, so 2.5 min = 150 s. Type minutes for seconds and the m:ss form, or seconds for minutes, plus the decimal trap.
- Gravel calculatorGravel calculator: cubic meters and tons needed for a driveway, bed or drain from length, width and depth – with allowance, gravel or sand, wet or dry, cost.
- HP to kW Converter: Horsepower, Kilowatts and TorqueConvert hp to kW and back, plus metric horsepower (PS), power from torque and rpm, and specific output per litre – exact NIST factors with the working shown.
- oz to liters and liters to oz converteroz to liters: 1 US fl oz = 0.0295735 L, so 64 oz = 1.8927 L. Type fluid ounces for liters (US or UK ounces), or liters for ounces, with a bottle-size chart.
- Heat index calculatorHeat index calculator: enter air temperature and relative humidity for the feels-like heat by the US National Weather Service formula, with levels and a chart.
- Mulch CalculatorMulch calculator for beds, tree rings and raised beds: cubic feet and cubic yards with extra, plus how many 1.5, 2 or 3 cu ft bags you need. Works for soil too.
- Stair calculatorStair calculator: enter the total rise to get the number of steps, riser height, tread depth, total run and angle – checked against US IRC or UK Part K.
- Dew Point Calculator: Humidity, Condensation and Mold RiskDew point calculator from temperature and humidity (Magnus formula) in °F or °C, plus absolute humidity, wall condensation and the mold-risk threshold.
- Board foot calculatorBoard foot calculator for boards, beams and logs: volume in board feet and cubic metres, weight from density and cost. Metric and imperial, in your browser.
- Seating Chart MakerFree online seating chart maker: add round and rectangular tables, paste your guest list, place names by drag and drop or keyboard, print. Data stays local.
- Overtime calculatorFree overtime calculator: compare scheduled and actual hours per week or month and work out overtime pay at time and a half (FLSA) or your own premium rate.
- Poll maker: create a poll without sign-upPoll maker with no account: enter a question and answers, invite by link, collect answer codes, see the result as bars. All local, no server involved.
- Weekly meal planner: plan dinners and get a grocery listWeekly meal planner: enter your own meals with ingredients, let the plan spread them over the week, get a grocery list and save it as PNG or TXT. Free.
- Steel weight calculatorSteel weight calculator for plate, round, square, flat and hex bar, pipe and square tube, also in aluminium, copper, brass or stainless. With kg per metre.
- Laundry symbols explained: read your care label and build the symbolsLaundry symbols explained: choose what your care label shows and read what washing, bleaching, drying, ironing and cleaning symbols mean. With a picture.
- Square meters to acres converterConvert square meters to acres and back: 1 acre = 4,046.86 m². Also hectares, square feet, square miles, are and tsubo – with the working and a table.
- Gas cost calculatorGas cost calculator for road trips: enter mpg, miles and gas price to get the total fuel cost, cost per person, gallons used and cost per mile. Metric too.
- Bra size calculator – measure underbust and bustBra size calculator: enter your underbust and bust in inches or cm to get band and cup, converted to US, UK, EU, FR and AU sizes, plus sister sizes. Free.
- BTU Calculator – What Size Air Conditioner Do I Need?BTU calculator for window and room air conditioners: enter square feet, sun, people and kitchen to get the BTU/h you need, the unit size to buy and the math.
- Length ConverterLength converter for mm, cm, m, km, inches, feet, yards, miles and nautical miles: instant result, all units compared, feet and inches, and the factor used.
- Beaufort scale calculatorConvert wind speed in mph, km/h, knots or m/s to the Beaufort scale or look up the speed of force 0 to 12, with names, effects on land and a full table.
- Cups to grams converterConvert cups, tablespoons and teaspoons to grams for flour, sugar, butter, milk, rice and more – US cups, metric cups and USDA weights. Grams to cups too.
- Pipe Volume CalculatorPipe volume calculator: enter diameter, wall thickness and length to get the water content in litres, per metre and the wait time until hot water arrives. Free.
- Compression Ratio CalculatorCompression ratio calculator for engines: enter bore, stroke and clearance volume to get the static ratio, or find the chamber volume needed for a target ratio.
- ABV calculatorABV calculator from original and final gravity (SG, Plato, Oechsle) for beer, wine and mead, or for mixed drinks, with attenuation. Free to use, no sign-up.
- Wedding guest list and RSVP trackerFree online wedding guest list: track RSVPs, plus-ones, meal choices and dietary needs, see live headcounts, export to CSV for Excel and print.
- How Much Rent Can I Afford?How much rent can I afford? Enter your income and see the rent that fits at 25% to 40% of income – or check whether one specific apartment is too expensive.
- Meat temperature chartMeat temperature chart: target internal temperature for beef, lamb, pork, ground meat, poultry and fish, doneness from rare to well done and when to stop.
- Paint calculatorPaint calculator: how much paint for walls and ceiling? Enter room size, doors, windows, coats and extra, and get gallons or liters with a can size tip.
- Time zone meeting plannerPlan a meeting across time zones: pick cities, a date and working hours to see the overlap in every local time, with daylight saving time handled.
- Wheel offset calculatorWheel offset calculator: how far do new wheels and tires stick out or sit in? Compare old and new offset (ET), wheel width and tire width, with track width.
- Wallpaper Calculator – How Many Rolls Do I Need?Wallpaper calculator by strips: enter room size, roll size, pattern repeat and drop match to see how many rolls to buy – with the working shown.
- Plant Spacing CalculatorPlant spacing calculator: how many plants fit in your bed? Rows, plants per row and per square foot – in a grid or staggered – or the spacing for a set number.
- Weight on the Moon calculatorWeight on the Moon calculator: see what you would weigh on the Moon, Mars, Jupiter and every planet, with scale reading, force in newtons and jump height. Free.
- Pool Volume Calculator – How Many Gallons Is My Pool?Pool volume calculator for rectangular, round, oval and kidney pools: enter size and depth, see gallons and liters – plus fill time and pump turnover time.
- Engine Displacement CalculatorEngine displacement calculator: enter bore, stroke and cylinder count to get cc, litres and cubic inches, plus bore/stroke ratio and mean piston speed. Free.
- Tile CalculatorTile calculator: how many tiles you need with grout joints and waste, the boxes to buy and the grout in kg for a floor or wall, from room and tile size.
- Fence CalculatorFence calculator: work out posts, sections, pickets or panels, rails, braces and concrete for your fence length – with gates, open run or closed boundary.
- Lumens to watts converterLumens to watts for LED, incandescent, halogen and CFL bulbs, plus the lumens a room needs in lux. With a comparison table and incandescent equivalent.
- Brick calculatorBrick calculator: number of bricks with waste and mortar needed for a wall from length, height, openings, brick size and joint. UK, US and metric bricks.
- mAh to Wh Converter for Batteries and Power BanksConvert mAh to Wh (and back) with the formula shown: watt-hours of a power bank, real phone charges, device runtime and whether it may fly in carry-on.
- Wind Chill CalculatorWind chill calculator: feels-like temperature from air temperature and wind speed using the weather service formula, plus heat index from humidity and a table.
- Pizza Dough CalculatorPizza dough calculator: flour, water, salt and yeast in baker’s percentages for any number of pizzas, with hydration, fresh and dry yeast in grams and ounces.
- Paver CalculatorPaver calculator: from area, paver size, joint and waste work out how many pavers you need, plus bedding and base volume. Free, works in feet and meters.
- Grass seed calculatorGrass seed calculator: seed needed from lawn area, bags, sod with waste allowance, starter fertilizer and topsoil – with guideline rates by lawn type.
- Electricity cost calculator for appliancesWork out what an appliance costs to run: enter watts, hours per day, days per week and your rate per kWh to get kWh and cost per day, month and year.
- Roof area calculatorRoof area calculator for gable, shed and hip roofs: from building size, pitch and overhang get roof area, rafter length, ridge height and squares of roofing.
- Energy ConverterEnergy converter for joules, kJ, MJ, Wh, kWh, calories, kcal, BTU and electronvolts, with conversion factor, comparison chart and appliance run time.
- Fertilizer CalculatorFertilizer calculator: from area, wanted nutrient rate and N-P-K content, work out the fertilizer amount in pounds and kilograms, plus the nutrient balance.
- Pond Liner CalculatorPond liner calculator: enter maximum length, width, depth and edge overlap to get the liner size you need and the pond volume in gallons and liters. Free.
- Shoe Size ConverterShoe size converter: EU, UK, US (men’s and women’s) and foot length in cm or inches in one step – with a table of neighboring sizes and tips for measuring.
- Fuel Consumption CalculatorFuel consumption calculator: work out l/100 km, km/l, mpg and cost per 100 km from litres filled and distance driven, or the fuel needed for a trip.
- Swim pace calculatorSwim pace calculator: from distance and time get your pace per 100 m or 100 yd, speed, split per length and projected times for 400 m, 1500 m, 1650 yd and more.
- Road trip cost calculatorRoad trip cost calculator: gas, driving time, lodging, food and tolls for the whole trip, with cost per person and per mile. Free, no sign-up needed.
- Depth of field calculatorDepth of field calculator: from sensor, focal length, aperture and distance get the near and far limit, total depth and hyperfocal distance. Free, no sign-up.
- Air changes per hour calculatorAir changes per hour calculator from room size and airflow, or the reverse: ACH, time to exchange the air and fresh air needed per person based on CO₂.
- U-value calculatorU-value calculator: work out the thermal transmittance of a wall, roof or floor from layer thickness and conductivity, with heat loss and annual energy.
- Timelapse CalculatorTimelapse calculator: from event length, clip length and frame rate get the shooting interval, photo count and storage needed, or work backwards. Free.
- 2 stroke oil mix calculator2 stroke oil mix calculator: oil for 25:1, 32:1, 40:1, 50:1 or 100:1 per gallon or litre of fuel, with a table of typical fill-ups, percentages and fl oz. Free.
- 500 Rule Calculator: Longest Exposure Before Star Trails500 rule calculator: maximum exposure time for point-like stars from focal length, sensor, aperture and megapixels, plus the more accurate NPF rule. Free.
- Air purifier size calculatorAir purifier size calculator: the minimum CADR for your room area and ceiling height from the EPA sizing chart – or the largest room a given CADR can serve.
- Angle of View Calculator: Horizontal, Vertical, DiagonalAngle of view calculator for any focal length and sensor size: horizontal, vertical and diagonal angle, plus the framed width at any distance and crop factor.
- Annual vs monthly subscription calculator: when does yearly pay off?Annual vs monthly subscription calculator: see after how many months the yearly plan is cheaper, what you save and what costs more if you stop early.
- Antifreeze mix ratio calculatorAntifreeze mix ratio calculator: freeze point of your coolant mix, how much concentrate you need for 0 °F or −30 °F, and how much to drain to make it stronger.
- Asphalt CalculatorAsphalt calculator for the tons needed from length, width, layer thickness and compacted density, with an allowance for waste; imperial and metric units.
- Average daily gain calculatorAverage daily gain calculator: ADG of cattle, pigs, sheep or goats from two weighings, predicted weight on show day and days to reach a target weight.
- Balcony solar calculatorBalcony solar calculator: annual output, self-consumption, savings and payback from panel power, orientation and your power price. Editable assumptions.
- Bar to kPa converterBar to kPa: multiply by 100, so 2.2 bar = 220 kPa. Convert bar to kilopascals or kPa to bar, with psi, atmospheres, megapascals and a pressure chart.
- Battery life calculatorBattery life calculator: divide capacity in mAh or Wh by the load in mA or watts, with an allowance for losses, shown as hours, days and minutes.
- Belt length calculator for two pulleysBelt length calculator: V-belt length from both pulley diameters and the center distance, or the center distance for a given belt – plus speed ratio.
- Bike frame size calculatorBike frame size calculator from your inseam for trekking, road, cyclocross and mountain bikes, in cm and inches, with the nearest common frame size.
- Bleach dilution calculatorBleach dilution calculator: how much household bleach to add to water for disinfecting – the CDC ratio of 5 tablespoons per gallon, scaled to any amount.
- Boiling point altitude calculatorBoiling point altitude calculator: the temperature at which water boils at your elevation or air pressure, in °F and °C, with a chart from sea level up.
- BTU to kW converterBTU to kW: divide BTU/h by 3,412.14, so 12,000 BTU/h = 3.517 kW. Convert air conditioner and heater ratings both ways, with watts and tons of cooling.
- Cake Pan Size Conversion CalculatorCake pan size conversion from round to square and back: the factor for another springform pan or sheet, scaled recipe amount and tips on baking time and depth.
- Car cost per month calculatorCalculate your car cost per month: depreciation, insurance, tax, fuel and upkeep – plus a comparison with transit or car sharing and the break-even mileage.
- Carry-on size checkerCarry-on size checker: does your bag fit 56 × 45 × 25 cm (22 × 18 × 10 in) or your airline's limit? With rotation, excess per side and optional weight check.
- CFM CalculatorCFM calculator for airflow from room size and air changes or from duct area and air velocity, with conversion to m³/h, L/s and m³/min and the steps shown.
- Circle skirt calculator: waist radius, hem and fabric for full, half and quarterCircle skirt calculator: waist radius, hem radius, hem width and fabric area for a full, 3/4, half or quarter circle skirt from your waist and skirt length.
- Cleaning schedule generator with fair rotationMake a cleaning schedule: enter names and chores, rotate them fairly, save a colour-coded chart as PNG and load the cleaning duties as a calendar file for all.
- Clothing size converterClothing size converter for women and men: DE, FR, IT, UK, US and Japan with bust measurement and S to XXL, plus the full size chart. Free to use.
- Cloud Base CalculatorCloud base calculator: estimate the cloud base height above ground from temperature and dew point with the FAA rule (spread ÷ 4.4 °F × 1,000 ft).
- Cm to meters converterCm to meters: divide by 100, so 175 cm = 1.75 m. Type centimeters for meters or meters for centimeters, with feet and inches below and a conversion chart.
- Cm to mm converterCm to mm: multiply by 10, so 2.5 cm = 25 mm. Type centimeters for millimeters or millimeters for centimeters, with inches below and a conversion chart.
- Coffee to Water Ratio CalculatorCoffee to water ratio calculator: grams of coffee for drip, French press, AeroPress, espresso, moka pot or cold brew – from water, coffee or number of cups.
- Commute cost calculator: is moving closer worth it?Commute cost calculator that compares commuting with moving: cost per month, time on the road and the point where a move pays off, with a chart. Free.
- Compost ratio calculator (carbon to nitrogen)Compost ratio calculator: the carbon-to-nitrogen (C/N) ratio and moisture of your mix of greens and browns, and how much to add for 30 : 1.
- Crop Factor CalculatorCrop factor calculator: choose a sensor size and see the crop factor, full-frame focal length, equivalent aperture and ISO, also for custom sizes. Free.
- Crosswind calculator: crosswind, headwind and tailwind for any runwayCrosswind calculator for pilots: crosswind and headwind or tailwind component from runway number, wind direction and speed, with gusts and your max crosswind.
- Cubic feet to cubic yards converterCubic feet to cubic yards: divide by 27, so 100 ft³ = 3.7037 yd³. Convert ft³ to yd³ or back for concrete, soil, mulch and gravel, with cubic meters.
- Cubic meters to cubic feet converterCubic meters to cubic feet: multiply by 35.3147, so 10 m³ = 353.1467 ft³. Convert m³ to ft³ or back, with cubic yards, liters and a conversion chart.
- Curtain fabric calculatorCurtain fabric calculator: metres of fabric, number of widths and cut length from rail width, drop, fullness, fabric width, hem and pattern repeat. Free to use.
- Cutting Speed CalculatorCutting speed calculator: get the spindle RPM from surface speed and tool diameter, or the speed from RPM, plus feed rate for milling, drilling and turning.
- Decking calculatorDecking calculator: how many deck boards and linear feet, how many joists and screws – from deck size, board width, gap, board length and joist spacing.
- Dehumidifier size calculatorDehumidifier size calculator: the minimum capacity in pints (and liters) per day for your room size and dampness, from the ENERGY STAR capacity chart.
- Density altitude calculator with dew pointDensity altitude calculator: density altitude and pressure altitude from field elevation, altimeter setting, temperature and dew point, using the NWS formulas.
- Dipole antenna calculatorDipole antenna calculator: total length and leg length of a half-wave dipole for any frequency in MHz, in feet and meters, with an adjustable velocity factor.
- Discount card worth it calculator: find your break-even spendDiscount card worth it? The calculator shows the yearly spend at which a card with a percentage discount pays off and compares two cards, with a chart. Free.
- Drip irrigation calculatorDrip irrigation calculator: application rate in inches per hour from emitter flow and spacing, run time for 1 inch of water and the flow of a 100 ft drip line.
- Drywall calculator for stud wallsDrywall calculator for metal stud walls: number of sheets, studs and track, screws and joint compound – one or two layers, 16 or 24 inch stud spacing.
- Egg Boiling Time CalculatorEgg boiling time calculator and egg timer: how long to boil an egg soft, medium or hard? Based on egg weight, fridge or room temperature and altitude.
- Electric car vs gas car cost: which is cheaper?Compare electric car vs gas car cost with your own numbers: total cost, cost per mile and the year the electric car pays off, with a chart. Free and private.
- Emergency water calculatorEmergency water calculator: how many gallons of water your household should store, based on the Ready.gov advice of one gallon per person per day.
- Epoxy resin calculatorEpoxy resin calculator: how much resin a tabletop, river table, round tray or mold needs – volume, weight and the split into resin and hardener.
- EV charging cost calculatorWork out what charging your electric car costs at home and at a public charger – from battery size, state of charge, charging losses and your price per kWh.
- EV charging time calculator – how long will it take to charge?EV charging time calculator: enter battery size, charge levels and charger power from a wall socket to a fast charger and see time, energy and range added.
- Exposure Value Calculator: EV and Equivalent ExposureExposure value calculator: work out the EV from aperture, shutter speed and ISO and see equivalent shutter speeds for every aperture. With working, free.
- FCR calculator (feed conversion ratio)FCR calculator: feed conversion ratio from feed fed and live weight gain, feed efficiency in percent, and how much feed a planned weight gain needs.
- Filament calculator for 3D printingFilament calculator: how many meters are on a 1 kg spool, how much a print weighs and what it costs – PLA, PETG, ABS, ASA, TPU and more, 1.75 or 2.85 mm.
- Firewood Cord CalculatorFirewood cord calculator: convert cords, stacked, solid and loose cubic meters into each other, turn stack dimensions into cords and compare prices per unit.
- Flash Guide Number Calculator: Aperture, Distance and ISOFlash guide number calculator: work out the right aperture from guide number, ISO, flash power and distance, and read the flash range for every aperture. Free.
- VAT calculator for France and SpainAdd or remove French VAT (TVA 20%, 10%, 5.5%, 2.1%) or Spanish VAT (IVA 21%, 10%, 4%) – net to gross and back, rounded to the cent, with official sources.
- Gas units to kWhConvert gas units to kWh from your meter reading: metric m³ or imperial 100 ft³, with the calorific value and correction factor from your bill, plus cost.
- Glass Weight CalculatorGlass weight calculator: enter the width, height and thickness of a pane and get its weight in lb and kg – float glass, borosilicate, acrylic or custom.
- Golden Hour Calculator: Times for Any Place and DateGolden hour calculator: start and end of golden hour and blue hour for any location and date, with sunrise and sunset. No app, no sign-up, free to use.
- Grain shrink calculatorGrain shrink calculator: weight loss when drying corn or other grain, e.g. from 25 % to 15.5 % moisture, with water shrink factor, handling loss and a table.
- Heat pump vs gas furnace calculator: when does it pay off?Heat pump vs gas furnace calculator: compare running costs, total cash outlay and the payback year of a heat pump using your own numbers, with a chart. Free.
- Heating cost comparisonHeating cost comparison: compare gas, oil, pellets, heat pump and electric heating from heat demand, energy price, efficiency and fixed costs. Adjustable.
- Heating Oil Usage CalculatorHeating oil usage calculator: how long will 100 gallons last? Work out gallons per day from your burner’s gph or Btu input and the days your tank will last.
- Hectares to acres converterHectares to acres: multiply by 2.4711, so 10 ha = 24.71 acres. Convert hectares to acres or acres to hectares, with square meters, square feet and a chart.
- Horizon distance calculatorHorizon distance calculator: how far away the sea horizon is from your eye height, and from how far a ship or lighthouse top becomes visible. Bowditch formula.
- Horizontal Tank Volume CalculatorHorizontal tank volume calculator for cylindrical tanks: liquid volume from the dipstick depth, or the depth from litres, with fill level. Free.
- Household budget tracker: income and spending at a glanceHousehold budget tracker without a spreadsheet: paste income and expenses, see savings rate and categories, save the chart as PNG and the data as CSV. Free.
- How much does smoking cost per month and per year?How much does smoking cost? Work out the cost per day, month and year, the total over 10 to 30 years with price rises and what you could invest. With chart.
- How much meat per person for a BBQHow much meat per person for a BBQ? Enter adults, kids, vegetarians and appetite to get meat, salad, bread and water for your cookout in pounds and pieces.
- Hull speed calculator for sailboats and displacement hullsHull speed calculator: the hull speed of a displacement boat from its waterline length (1.34 × √LWL in knots and feet), with km/h, m/s and speed-length ratio.
- Kg to oz converterKg to oz: multiply by 35.274, so 1 kg = 35.274 oz. Convert kilograms to ounces or ounces to kg, with pounds and ounces, troy ounces and a chart.
- Knitting gauge calculatorKnitting gauge calculator: find stitches and rows per 10 cm, the cast-on for your width with repeat and edge stitches, or convert a pattern to your gauge.
- Knitting increase calculatorKnitting increase calculator: spread increases or decreases evenly across a round or row and get the written pattern, e.g. 60 stitches plus 10 increases.
- Ladder length calculatorLadder length calculator: what size ladder you need to reach a roof or wall height with 3 ft of overhang, how far the base goes out, and the 4:1 angle check.
- Laminate Flooring CalculatorLaminate flooring calculator: boxes for your room from length, width, waste and box coverage, plus underlay, skirting, plank count and cost. Metric or feet.
- Lawn watering calculatorLawn watering calculator: measure your sprinkler with the tuna can test and get the run time for 1 inch of water per week (1.5 inches in the hottest weeks).
- Leaky faucet calculatorLeaky faucet calculator: count the drips per minute and see how many gallons a dripping faucet wastes per day, month and year – and what it costs.
- Lease vs buy car calculator: which costs less?Lease vs buy car calculator: compare paying cash, a loan and a lease over the same term, with resale value, extra miles and lost interest, with a chart. Free.
- Lye calculator for cold process soapLye calculator for soap making: sodium hydroxide or potassium hydroxide and water for your oils, with superfat, lye purity and lye concentration.
- m/s to km/h converterm/s to km/h: multiply by 3.6, so 10 m/s = 36 km/h. Convert meters per second to kilometers per hour or back, with mph, knots and a conversion chart.
- m/s to mph converterm/s to mph: multiply by 2.2369, so 10 m/s = 22.3694 mph. Convert meters per second to miles per hour or back, with km/h, knots and a speed chart.
- Miter angle calculatorMiter angle calculator for wall corners, picture frames, polygons and sloped sides: miter saw setting plus bevel, with a table of common values.
- ml to cups converterml to cups: divide by 236.59, so 250 ml = 1.0567 US cups. Convert milliliters to cups or cups to ml, with tablespoons, fluid ounces and a chart.
- ml to liters converterml to liters: divide by 1,000, so 250 ml = 0.25 L. Convert milliliters to liters or liters to ml, with centiliters, US fluid ounces and a chart.
- Mm to m converterMm to m: divide by 1000, so 1,500 mm = 1.5 m. Type millimeters for meters or meters for millimeters, with inches below and a conversion chart for plans.
- mpg to l/100km converterConvert mpg to l/100km and back, plus km/l: US and UK gallon, step-by-step formula, a comparison chart and the range you get from a full tank.
- ND Filter CalculatorND filter calculator: enter the exposure time without a filter, choose the ND strength and see the new time with stops and density, also for stacked filters.
- Packing list generatorPacking list for any trip: pick the trip type, how you travel and the length, and get a list with quantities for clothes, documents and tech. Free to use.
- Part time salary calculator: pay, hourly rate and holidayPart time salary calculator: see your pro-rata pay, unchanged hourly rate and holiday entitlement, plus a table from 10 to 40 hours a week. Free.
- Party and Wedding Drink CalculatorEstimate how much beer, wine, sparkling wine, spirits for mixed drinks, soft drinks, water and ice to buy – in litres, bottles and cases per guest.
- Pellet consumption calculatorPellet consumption calculator for pellet stoves and boilers: pounds per hour from BTU rating and efficiency, bags per day and pellets per year.
- Pipe flow rate calculatorPipe flow rate calculator: from diameter and velocity or the other way round, with Reynolds number and pressure drop for water pipes. With the working shown.
- Plaster calculator for walls and renderPlaster calculator: how many kg and bags of plaster or render you need for a wall – from area, thickness and the coverage stated on the data sheet.
- Pool chlorine calculatorPool chlorine calculator: how much liquid chlorine, cal-hypo, dichlor or trichlor to raise free chlorine or shock your pool – with CDC target levels.
- Pool salt calculator for salt water poolsPool salt calculator: how many pounds or kilograms of salt and how many bags to raise your salt water pool from the current level to 3200 ppm.
- Propane usage calculatorPropane usage calculator: how long a 20 lb or 100 lb propane tank lasts on a grill, heater or stove, from the BTU rating – in hours and days.
- Radiator size calculatorRadiator size calculator: the rated output needed for a heat demand at your flow temperature, or the real output of a radiator, for example with a heat pump.
- Rainwater harvesting calculatorRainwater harvesting calculator: how much your roof collects a year, how much you use for toilets, laundry and garden, and what size tank to buy.
- Raised Bed Soil CalculatorRaised bed soil calculator: how much soil, compost, leaves and branches do you need? Liters, cubic feet and bags per layer, with a settling allowance.
- Raw to cooked weight calculatorConvert raw to cooked weight and back for chicken, ground beef, pork and more, using USDA cooking yields with their minimum and maximum range.
- Rebar CalculatorRebar calculator for slabs: enter size, spacing and edge cover and get the number of bars each way, total length and steel weight for #3–#18 or metric.
- Recipe scalerRecipe scaler: convert a recipe to more or fewer servings. Paste the ingredient list and all amounts adjust at once – fractions like 1/2 included.
- Repair or replace calculatorRepair or replace? Compare repair and replacement cost per year of use, see the break-even repair price and how long the repair has to last to pay off.
- Ring Size ConverterRing size converter: enter finger circumference or diameter in mm and see the size in ISO/EU, US, UK, Swiss and Japanese systems, with measuring tips. Free.
- Roommate rent split calculator: fair by room size and billsRoommate rent split calculator: share rent by room size, common areas and utilities fairly, with extras for a balcony or bath. With chart and text file.
- Saddle height calculatorSaddle height calculator: bike seat height from your inseam with the Ferrer-Roca equation (knee angle 30–40°) and the 106 % and 109 % inseam rules.
- Savings goal calculatorSavings goal calculator: find out how much to save each month to reach your target, or how long it takes at your monthly amount – with interest.
- Schengen calculator for the 90/180-day ruleSchengen calculator: enter your past trips and see how many of your 90 days are used, how many are left and how long your next stay may last.
- Screed Calculator: Volume, Weight and BagsScreed calculator: work out volume, weight in kg and the number of bags from area, thickness and consumption, with allowance and edge strip. Free.
- Sea level pressure calculatorSea level pressure calculator: convert your barometer’s station pressure and elevation to sea level pressure (altimeter setting) and back, in inHg, hPa or mmHg.
- Self leveling compound calculatorSelf leveling compound calculator: how many bags of floor leveler for your area and depth, in square feet and inches or m² and mm, plus primer.
- Snow to Rain Ratio CalculatorSnow to rain ratio calculator: convert inches of snow to inches of water and back with 10:1 or your own ratio, from heavy wet 6:1 snow to light 30:1 powder.
- Solar panel payback calculator: when does it pay off?Solar panel payback calculator: enter system size, cost, yield, self-use and export price to see when it pays for itself and your profit, with a chart. Free.
- Sourdough Calculator for Bread DoughSourdough calculator by baker’s percentage: work out flour, water, salt, yeast and starter for bread dough, with hydration and the flour in the starter counted.
- Speeding fine calculator (England and Wales)Speeding fine calculator for England and Wales: Band A, B or C fine from your weekly income, guilty plea discount, victim surcharge and penalty points.
- Speeding ticket calculator Ontario (set fines 2026)Speeding ticket calculator Ontario: set fine per km/h over, victim fine surcharge, $5 costs, demerit points and stunt driving – incl. community safety zones.
- Split expenses calculator for groupsSplit trip and group expenses online: who paid what and who owes whom – settled with as few payments as possible. No app, no sign-up, data stays local.
- Square meters to square feet converterSquare meters to square feet: multiply by 10.7639, so 50 m² = 538.2 ft². Convert m² to ft² or back, with square yards and a chart for floor areas.
- Stopping distance calculatorCalculate thinking, braking and total stopping distance in mph or km/h from reaction time and road conditions (dry, wet, snow, ice) – with the physics formula.
- Subscription cost calculator with cancellation remindersSubscription cost calculator: add up all subscriptions per month and year, spot the most expensive and download last-day-to-cancel reminders as an ICS file.
- Sun Position CalculatorSun position for any place and date: azimuth and altitude through the day as a chart, sunrise, solar noon, sunset and twilight – NOAA method, no app needed.
- Telescope magnification calculatorTelescope magnification calculator: from focal length, eyepiece and Barlow get magnification, exit pupil, field of view, resolution and the useful upper limit.
- Temperature at altitude calculatorTemperature at altitude calculator: estimate the summit temperature from a valley reading with the NASA standard atmosphere drop of 3.56 °F per 1000 ft.
- Tile adhesive calculatorTile adhesive calculator: kg of tile adhesive or thinset per m² and how many bags – by notched trowel size of 4, 6, 8 or 10 mm, with waste and mixing water.
- Tire age calculator (DOT date code)Tire age calculator: decode the last four digits of the DOT code into the week and year of manufacture, the exact dates and the age of your tires today.
- Tire Pressure Temperature CalculatorTire pressure temperature calculator: see how much psi your tires lose in the cold, a chart from 10 to 90 °F, and what to inflate to in a warm garage.
- Tons to lbs converterTons to lbs: multiply by 2,000, so 2.5 tons = 5,000 lb. Convert US short tons to pounds or pounds to tons, with kilograms, metric tonnes and a chart.
- Travel Budget CalculatorWork out what your trip costs: travel, accommodation, food, activities and a buffer – total, per person and per day, optionally in a foreign currency.
- tsp to tbsp convertertsp to tbsp: divide by 3, so 4 teaspoons = 1.3333 tablespoons. Convert teaspoons to tablespoons or back, with milliliters and a measuring chart.
- Turkey cooking time calculatorTurkey cooking time calculator: how long to roast a turkey at 325 °F by weight – stuffed or unstuffed, from frozen, plus thawing time, per the USDA timetable.
- TV viewing distance calculatorTV viewing distance calculator: the ideal seating distance for 4K, 1080p and 8K screens from the ITU factors – or the TV size that fits your couch distance.
- VPD calculator (vapor pressure deficit)VPD calculator: vapor pressure deficit in kPa from air temperature and relative humidity, optional leaf VPD, plus the humidity deficit in g/m³ – °F or °C.
- Water Hardness ConverterWater hardness converter between °dH, mmol/l, °fH, °e, gpg and ppm (mg/l CaCO₃), with the hardness class from soft to very hard. Free, no sign-up.
- Wedding budget calculator and plannerFree wedding budget planner: items with planned, actual and paid amounts, remaining budget, balance due and CSV export. Your data stays in your browser.
- Wet Bulb CalculatorWet bulb calculator: wet-bulb temperature from air temperature, relative humidity and pressure, using the National Weather Service formula. In °F or °C.
- Wheelchair ramp calculator (ADA 1:12)Wheelchair ramp calculator: the minimum ramp length for your rise under the ADA 1:12 rule, with runs, 60-inch landings and handrails – in feet or meters.
- Yeast conversion calculatorYeast conversion calculator: convert fresh (cake) yeast to active dry or instant yeast and back – in grams, ounces, packets and teaspoons.