Pounds to Kilograms (lbs to kg)
1 lb = 0.453592 kg
To convert pounds to kilograms: kilograms = pounds × 0.45359237
| pounds | kilograms |
|---|---|
| 0.25 lb | 0.1134 kg |
| 0.5 lb | 0.2268 kg |
| 0.75 lb | 0.3402 kg |
| 1 lb | 0.4536 kg |
| 1.5 lb | 0.6804 kg |
| 2 lb | 0.9072 kg |
| 5 lb | 2.268 kg |
| 10 lb | 4.536 kg |
| 50 lb | 22.68 kg |
| 90 lb | 40.82 kg |
| 100 lb | 45.36 kg |
| 150 lb | 68.04 kg |
| 180 lb | 81.65 kg |
| 200 lb | 90.72 kg |
Price per pound to price per kilogram: multiply by 2.20462 (a kilogram is 2.2 pounds). $2.99/lb = $6.59/kg, $1.99/lb = $4.39/kg, $12/lb = $26.46/kg.
Multiply pounds by 0.45359237 to get kilograms — that factor is the legal definition of the international pound. Dividing by 2.2046 gives the same answer to four decimal places.
Formula
kilograms = pounds × 0.45359237
Example: 10 pounds = 4.53592 kilograms.
How to convert pounds to kilograms in your head
- Halve it, then take off a tenth of the half: 150 lb → 75 → 75 − 7.5 = 67.5 kg (exact: 68.04). The shortcut is about 1% low.
- Divide by 2.2 for a closer answer: 90 ÷ 2.2 = 40.9 kg (exact: 40.82).
- Remember the anchors: 1 lb ≈ 0.45 kg, 10 lb ≈ 4.5 kg, 100 lb ≈ 45.4 kg, 220 lb ≈ 100 kg.
Pounds to Kilograms chart
| pounds | kilograms |
|---|---|
| 1 | 0.453592 |
| 2 | 0.907185 |
| 5 | 2.26796 |
| 10 | 4.53592 |
| 20 | 9.07185 |
| 25 | 11.3398 |
| 45 | 20.4117 |
| 50 | 22.6796 |
| 100 | 45.3592 |
| 120 | 54.4311 |
| 130 | 58.967 |
| 140 | 63.5029 |
| 150 | 68.0389 |
| 160 | 72.5748 |
| 180 | 81.6466 |
| 200 | 90.7185 |
| 220 | 99.7903 |
| 250 | 113.398 |
Pounds to kilograms for the weights people look up most
| What | pounds | kilograms | Grams |
|---|---|---|---|
| Half a pound | 0.5 | 0.226796 | 226.796 |
| 1 pound | 1 | 0.453592 | 453.592 |
| 1½ pounds | 1.5 | 0.680389 | 680.389 |
| 2 | 0.907185 | 907.185 | |
| 5 | 2.26796 | 2,267.96 | |
| 10 | 4.53592 | 4,535.92 | |
| 41 | 18.5973 | 18,597.3 | |
| Common checked-bag limit (US airlines) | 50 | 22.6796 | 22,679.6 |
| 90 | 40.8233 | 40,823.3 | |
| 100 | 45.3592 | 45,359.2 | |
| 130 | 58.967 | 58,967 | |
| 150 | 68.0389 | 68,038.9 | |
| 165 | 74.8427 | 74,842.7 | |
| 180 | 81.6466 | 81,646.6 | |
| 200 | 90.7185 | 90,718.5 | |
| 220 | 99.7903 | 99,790.3 | |
| 250 | 113.398 | 113,398 | |
| 300 | 136.078 | 136,078 |
Good to know
A quick estimate: halve the pounds and take off 10%. 180 lb ÷ 2 = 90, minus 9 = 81 kg (the exact figure is 81.65).
Medication doses for children and animals are often given per kilogram, which is one of the few everyday cases where the exact number matters — use the calculator rather than the estimate there.
For anything other than weight, the unit converter on our home page covers 100+ units with formulas and charts.
Read next: Pounds and ounces to kg, decimal pounds and lbs to metric tons
Common pounds to kilograms mistakes
- Writing 1 1/2 lb as 1.2 or 1.12. A pound and a half is 1.5 lb, which is 0.68 kg.
- Multiplying by 2.2 instead of dividing. Pounds to kilograms makes the number smaller: 100 lb is 45.36 kg, not 220 kg.
- Rounding the factor for doses. The pound is exactly 0.45359237 kg (NIST SP 811); for medication per kg, use the exact factor or the calculator.
- Converting stones as decimals. 10 st 6 lb is 146 lb (10 × 14 + 6), not 10.6 stone. Convert to pounds first, then to kg.
Sources
Frequently asked questions
How many kg is 1 pound?
1 pound is 0.45359237 kg — about 454 grams.
How many kg is 150 lbs?
150 lb is 68.04 kg.
How do I convert stones and pounds to kg?
Convert to pounds first (1 stone = 14 lb), then multiply by 0.45359237. 11 st 4 lb = 158 lb = 71.67 kg.
How many kg is 90 lbs?
90 lb is 40.82 kg.
How many kg is 41 lbs?
41 lb is 18.60 kg.
How many kg is 1 1/2 lb?
1.5 lb is 0.680 kg, or 680 g.
Is an American pound the same as a UK pound?
Yes. Both use the international avoirdupois pound of exactly 0.45359237 kg, defined in 1959.
How many kg is 200 lbs?
200 lb is 90.72 kg.