Instant Unit Conversion
Convert Pounds to Kilograms (lbs to kg)
Exact formula, conversion factors, live calculator, and reference charts for pounds to kilograms.
Method reviewed:Exact defined factors — international yard and pound (1959), US customary gallon and cup, SI — the values NIST SP 811 lists · reviewed September 2026 · Source: NIST SP 811
1 pound is equal to exactly 0.45359237 kilograms. To convert pounds to kg, multiply by 0.453592 (or divide by 2.20462).
Live Pounds to Kilograms Calculator
kg = lbs × 0.453592Open full mass converter →Pounds to Kilograms Conversion Table
Quick reference conversion chart from 1 to 100 pounds.
| Pounds (lbs) | Kilograms (kg) | Mathematical Formula |
|---|---|---|
| 1 lbs | 0.4536 kg | 1 × 0.453592 |
| 2 lbs | 0.9072 kg | 2 × 0.453592 |
| 5 lbs | 2.268 kg | 5 × 0.453592 |
| 10 lbs | 4.5359 kg | 10 × 0.453592 |
| 15 lbs | 6.8039 kg | 15 × 0.453592 |
| 20 lbs | 9.0718 kg | 20 × 0.453592 |
| 25 lbs | 11.3398 kg | 25 × 0.453592 |
| 50 lbs | 22.6796 kg | 50 × 0.453592 |
| 75 lbs | 34.0194 kg | 75 × 0.453592 |
| 100 lbs | 45.3592 kg | 100 × 0.453592 |
Frequently Asked Questions
How many kg is 1 pound?
1 international avoirdupois pound is legally defined as exactly 0.45359237 kilograms.
How do you convert pounds to kilograms in your head?
Divide by 2.2 for a fast estimate (150 lb ÷ 2.2 ≈ 68 kg; exact is 68.04 kg). A closer mental trick: halve the pounds, then subtract a tenth of the result — 150 ÷ 2 = 75, minus 7.5 = 67.5 kg.
Why do airlines and gyms use kilograms instead of pounds?
The kilogram is the SI base unit of mass, so international aviation, medicine and sport standardize on it: a 23 kg checked-bag limit is about 50.7 lb, and Olympic weightlifting plates are denominated in kilos.