Divide pounds by 2.20462, or multiply by 0.45359237, to get kilograms. Use it for body weight, airline baggage, shipping and recipes.
How to use the lbs to kg Converter
- Type the number of pounds into the Pounds field. Decimals such as 75 are fine.
- Read the answer in Kilograms – it updates as you type, with no button to press.
- To convert the other way, type into Kilograms and the pounds are recalculated.
- Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.
This page converts only lb ⇄ kg. Need a different unit? Use the general weight converter, where you can choose any “from” and “to” unit.
How it works
Both units measure weight, so they are always in the same ratio: one pound equals 0.45359237 kilograms. The calculator multiplies the number of pounds you type by 0.45359237 to give kilograms, and when you type into the kilograms field it divides by the same factor to give pounds. Because the ratio never changes, doubling the pounds always doubles the kilograms. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).
How to convert pounds to kilograms
- Write down the value in pounds, for example 150 lb.
- Multiply by the conversion factor 0.45359237 (because 1 pound = 0.45359237 kg).
- 150 × 0.45359237 = 68.038855 kg.
- To go back from kilograms to pounds, divide by 0.45359237 – or multiply by 2.2046226.
lb to kg conversion table
| Pounds | Kilograms | Kilograms | Pounds |
|---|---|---|---|
| 1 lb | 0.45359237 kg | 1 kg | 2.2046226 lb |
| 10 lb | 4.5359237 kg | 2 kg | 4.4092452 lb |
| 20 lb | 9.0718474 kg | 5 kg | 11.023113 lb |
| 45 lb | 20.411657 kg | 10 kg | 22.046226 lb |
| 50 lb | 22.679619 kg | 20 kg | 44.092452 lb |
| 120 lb | 54.431084 kg | 50 kg | 110.23113 lb |
| 130 lb | 58.967008 kg | 100 kg | 220.46226 lb |
| 150 lb | 68.038855 kg | 1,000 kg | 2,204.6226 lb |
| 160 lb | 72.574779 kg | ||
| 200 lb | 90.718474 kg | ||
| 220 lb | 99.790321 kg | ||
| 300 lb | 136.07771 kg |
What is a pound?
The avoirdupois pound is defined as exactly 0.45359237 kg and is divided into 16 ounces. It is the everyday weight unit in the U.S. and is still widely used in the UK for body weight and food.
What is a kilogram?
The kilogram is the SI base unit of mass. Since 2019 it has been defined through the Planck constant rather than a platinum-iridium cylinder kept near Paris.
Quick mental conversion
For a fast estimate, multiply pounds by about 0.45 to get kilograms; the error is about 0.8%. Use the calculator above when you need the exact figure.
Common mistakes to avoid
Confusing fluid ounces (volume) with ounces (weight), using troy ounces for food or regular ounces for gold, and mixing u.s. short tons, uk long tons and metric tonnes.
Formula
1 lb = 0.45359237 kg1 kg = 2.2046226 lbkg = lb × 0.45359237Worked example
Inputs — Pounds: 150 lb.
Results — Kilograms = 68.0388555 kg.
Frequently asked questions
How many kg is 150 lb?
About 68.04 kg.
What is a stone in kg?
14 lb, about 6.35 kg.
How do I convert pounds to kilograms?
Multiply the number of pounds by 0.45359237. For example, 150 lb × 0.45359237 = 68.038855 kg.
How do I convert kilograms back to pounds?
Divide by 0.45359237 (or multiply by 2.2046226), or simply type the value into the kilograms field above.
What is 10 lb in kilograms?
10 lb = 4.5359237 kg.
What is 100 lb in kilograms?
100 lb = 45.359237 kg.
Is this conversion exact?
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.
Can I convert to other units on this page?
This page converts only between pounds and kilograms. To pick any weight unit, use the general weight converter linked under Related calculators.
What formula does the lbs to kg Converter use?
1 lb = 0.45359237 kg.