Math & School
Percentage calculator, rule of three, fractions, grade average and GPA, age calculator – with clear step-by-step working, free and easy to use.
A percentage calculator, fraction calculator, proportion and exponent calculators with step-by-step working, plus a GPA calculator, letter grade to GPA, standard deviation calculator, age calculator and a date calculator that skips public holidays.
9 tools
- Age CalculatorCalculate your exact age from your date of birth in years, months and days, in total days, weeks and months – plus the countdown to your next birthday.
- Date CalculatorCount the days between two dates, add or subtract days, weeks, months or years, and add business days with public holidays for your country.
- Exponent calculator with stepsCalculate powers, nth roots and logarithms with any base – step-by-step, with negative and fractional exponents, ln, log and scientific notation.
- Fraction CalculatorAdd, subtract, multiply and divide fractions and mixed numbers with step-by-step solutions. Simplify fractions and convert decimals to fractions.
- GPA & Weighted Grade CalculatorCalculate your GPA or weighted grade average: enter letter grades or numbers with credits or weights and get the result with every step shown.
- Grade Converter: Letter Grade to GPA and MoreConvert a letter grade to GPA points on the 4.0 scale, or points to a grade on official scales: German IHK and Abitur, French /20, Spanish 0–10.
- Percentage CalculatorFree percentage calculator: find X% of a number, what percent one number is of another, percentage change, increase and discount – with formula and steps.
- Proportion CalculatorSolve direct and inverse proportion problems (rule of three) online: find x from a ↔ b and c, with the unit value and step-by-step working.
- Standard deviation calculatorPaste your numbers to get mean, median, mode, range, variance and standard deviation (sample and population) instantly – with step-by-step working.