How to convert pounds to kilograms
One pound equals 0.453592 kilograms, so multiply the number of pounds by 0.453592:
kg = lb × 0.453592
lb = kg ÷ 0.453592 (1 kg = 2.2046 lb)
Example: 7.5 lb → 7.5 × 0.453592 = 3.4019 kg.
Going the other way, divide by 0.453592, or multiply by 2.2046; the kilograms to pounds converter does it for you.
Everyday values
| Pounds | Kilograms | For example |
|---|---|---|
| 1 lb | 0.453592 kg | one pound |
| 7.5 lb | 3.4019 kg | a newborn baby |
| 50 lb | 22.6796 kg | a checked-bag limit on US airlines |
| 150 lb | 68.0389 kg | an average adult |
| 200 lb | 90.7185 kg | a heavy adult |
When you need this conversion
A quick estimate is to halve the pounds and subtract 10%: 150 lb → 75 → about 68 kg (exact: 68.04 kg). Nutrition labels, recipes and weight-loss plans from the US use pounds, so converting helps when following them elsewhere.
Pound to kilogram conversion table
| lb | kg | lb | kg |
|---|---|---|---|
| 5 lb | 2.268 kg | 80 lb | 36.2874 kg |
| 10 lb | 4.5359 kg | 85 lb | 38.5554 kg |
| 15 lb | 6.8039 kg | 90 lb | 40.8233 kg |
| 20 lb | 9.0719 kg | 95 lb | 43.0913 kg |
| 25 lb | 11.3398 kg | 100 lb | 45.3592 kg |
| 30 lb | 13.6078 kg | 105 lb | 47.6272 kg |
| 35 lb | 15.8757 kg | 110 lb | 49.8952 kg |
| 40 lb | 18.1437 kg | 115 lb | 52.1631 kg |
| 45 lb | 20.4117 kg | 120 lb | 54.4311 kg |
| 50 lb | 22.6796 kg | 125 lb | 56.699 kg |
| 55 lb | 24.9476 kg | 130 lb | 58.967 kg |
| 60 lb | 27.2155 kg | 135 lb | 61.235 kg |
| 65 lb | 29.4835 kg | 140 lb | 63.5029 kg |
| 70 lb | 31.7515 kg | 145 lb | 65.7709 kg |
| 75 lb | 34.0194 kg | 150 lb | 68.0389 kg |
About the units
- Pound (lb): exactly 0.45359237 kilograms (international avoirdupois pound).
- Kilogram (kg): the SI base unit of mass, defined through the Planck constant since 2019.
Both are units of weight (mass). The conversion factor comes from the exact definitions above, so the calculator is exact; results are only rounded for display (up to six significant digits).
Frequently asked questions
How many kilograms are in one pound?
One pound is 0.453592 kilograms. One kilogram is 2.2046 pounds.
How do I convert pounds to kilograms?
Multiply the value in pounds by 0.453592. To go back, divide by 0.453592.
What is 7.5 lb in kilograms?
7.5 lb = 3.4019 kg.
What is 50 lb in kilograms?
50 lb = 22.6796 kg.
Sources
- NIST Special Publication 811 (2008), Guide for the Use of the International System of Units (SI), Appendix B: conversion factors.
- NIST Handbook 44 (2024), Appendix C: General tables of units of measurement.
Last reviewed 5 October 2026. Results are estimates; see our disclaimer.