Pounds to Kilograms Converter
Convert pounds to kilograms instantly and back. Uses the exact 0.45359237 kg per pound factor, with worked examples, a body-weight chart and common lb to kg conversions.
Updated 2026-06-14 · Free · No sign-up · Runs privately in your browser
Show the formula & steps
How the Pounds to Kilograms Converter Works
This converter switches between pounds (lb) and kilograms (kg) in both directions, using the exact international factor of 0.45359237 kg per pound. Type a value, pick the direction, and the result updates live with the steps shown.
The Formula
Kilograms = pounds × 0.45359237
The pound here is the international avoirdupois pound, the standard for body weight and everyday mass in the US and UK. To convert kilograms back to pounds, divide by 0.45359237 (or multiply by about 2.20462).
Worked Example
Convert 150 pounds to kilograms:
- 150 × 0.45359237 = 68.04 kg
Convert 70 kilograms to pounds:
- 70 ÷ 0.45359237 = 154.32 lb
Body-Weight Reference Chart
| Pounds | Kilograms |
|---|---|
| 100 | 45.36 |
| 130 | 58.97 |
| 150 | 68.04 |
| 180 | 81.65 |
| 200 | 90.72 |
The Quick Mental Shortcut
For a fast estimate, divide pounds by 2.2 to get kilograms, or multiply kilograms by 2.2 to get pounds. This is accurate to within about 1%, which is fine for everyday use. For medical dosing, shipping or sports records, use the exact 0.45359237 factor.
Frequently asked questions
How many kilograms are in a pound?+
One pound equals exactly 0.45359237 kilograms, usually rounded to 0.4536 kg. So 1 kg is about 2.20462 pounds.
How do I convert pounds to kilograms?+
Multiply the number of pounds by 0.45359237. For example, 150 pounds × 0.45359237 = 68.04 kg. To reverse it, divide kilograms by the same factor.
How many kg is 150 pounds?+
150 pounds equals about 68.04 kilograms. Multiply 150 by 0.45359237 to get the precise value of 68.039 kg.
What is the quick mental shortcut for lb to kg?+
Divide pounds by 2.2 for a fast estimate. For example, 150 ÷ 2.2 ≈ 68 kg, which is very close to the exact figure of 68.04 kg.
How many kg is 200 pounds?+
200 pounds equals about 90.72 kilograms. Multiply 200 by 0.45359237 to confirm the figure of 90.718 kg.