lbs to kg converter

lbs to kg instantly: 1 pound is exactly 0.45359237 kg, about 0.4536 kg. Enter pounds and see kilograms while you type – 150 lb = 68.039 kg. You also get the pounds-and-ounces and stone forms, and kg to lbs works in the same box.

Example: Weight 150 · Direction: Pounds to kg (lbs → kg) → Answer: 150 lb = 68.039 kg. Source: NIST SP 811, Appendix B.8 – pound (avoirdupois) = 0.45359237 kg (exact), ounce = 1/16 pound. Updated: .

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Result

Answer
150 lb = 68.039 kg
Pounds and ounces, stone
In pounds and ounces: 150 lb 0 oz. In stone (UK): 10 st 10 lb.
Working
150 lb × 0.45359237 = 68.039 kg
Quick check in your head
150 ÷ 2.2 ≈ 68.2 kg (exact: 68.039 kg). Halve the pounds, then take off 10 % of that.
Conversion chart
lbkg
10.4536
20.9072
52.268
104.536
156.804
209.072
2511.34
3013.608
3515.876
4520.412
5022.68
7031.751
10045.359
13561.235
15068.039
18081.647
20090.718
225102.058
250113.398
300136.078
Weights worth knowing
Weightlbkg
Average newborn (about 7.5 lb)7.53.402
Gym plate, 10 lb104.536
Heaviest standard bowling ball (16 lb)167.257
Gym plate, 25 lb2511.34
Gym plate, 45 lb (the 20 kg plate)4520.412
Common checked-bag limit (50 lb)5022.68
Heavy-bag limit with surcharge (70 lb)7031.751
One pound is defined as exactly 0.45359237 kg (international agreement of 1959), so pounds to kg is exact; kg to pounds is rounded for display.

How it is calculated

How to convert lbs to kg

kilograms = pounds × 0.45359237. For 150 lb: 150 × 0.45359237 = 68.039 kg. Going back, pounds = kilograms ÷ 0.45359237, or kilograms × 2.20462: 100 kg ÷ 0.45359237 = 220.462 lb. The factor is exact: since 1959 the international pound is defined as 0.45359237 kg, and one pound is 16 ounces.

Gym plates: 45 lb is not 20 kg

American plates are marked in pounds, and the usual 45 lb plate is 20.412 kg, not the 20 kg of a metric plate. Four of them on each side of a 45 lb bar add up to 8 × 45 + 45 = 405 lb, which is 183.705 kg. Smaller plates: 25 lb = 11.34 kg, 10 lb = 4.536 kg. Mixing metric and pound plates makes your total off by a few percent, so convert each one before adding.

Airline baggage limits

US airlines usually allow 50 lb in the standard checked bag, which is 22.68 kg, while many airlines elsewhere cap at 23 kg. The heavy-bag band up to 70 lb is 31.751 kg – close to the 32 kg that many carriers treat as the safety maximum. Weigh in kilograms, and a bag marked 23 kg is 50.706 lb, a hair over the 50 lb line.

Pounds and ounces, stone

Babies are weighed in pounds and ounces: 7.5 lb is 7 lb 8 oz, or 3.402 kg. In the UK body weight is given in stone (1 st = 14 lb = 6.350 kg); 150 lb is 10 st 10 lb. The line under the answer shows both forms.

A quick mental trick

Divide pounds by 2.2: 150 ÷ 2.2 = 68.2 kg against 68.039 exact. Or halve the pounds and subtract 10 % of the half: 150 → 75 → 67.5 kg. In the other direction double the kilograms and add 10 %: 70 kg → 140 + 14 = 154 lb (exact: 154.324).

The kg to lbs converter also handles ounces and stone; for body weight see the BMI calculator.

Frequently asked questions

How many kg is 1 lb?

1 pound is 0.45359237 kg, rounded 0.4536 kg. 10 lb is 4.536 kg and 100 lb is 45.359 kg.

How do I convert lbs to kg?

Multiply the pounds by 0.45359237, or divide by 2.20462. Example: 200 lb × 0.45359237 = 90.718 kg.

How many kg is 150 lbs?

150 lb is 68.039 kg, or 10 st 10 lb in the UK.

How many pounds is 100 kg?

100 kg is 220.462 lb, which is 220 lb 7.4 oz.

Is the 45 lb gym plate the same as a 20 kg plate?

No. A 45 lb plate weighs 20.412 kg, so it is 0.412 kg (about 2 %) heavier than a 20 kg plate.

Sources and legal basis

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