Pounds to Kilograms converter (lb → kg)
90 lb = 40.8233 kg. 1 lb = 0.4536 kg. Type any value below for an instant answer, or find your number in the conversion chart.
lb to kg formula
Worked example: 16 lb = 7.2575 kg. The defining value behind this factor is documented on our mass & weight standards page.
Pounds to Kilograms chart
Includes standard reference values plus the specific numbers people search for most.
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 1 lb | 0.4536 kg |
| 2 lb | 0.9072 kg |
| 3 lb | 1.3608 kg |
| 4 lb | 1.8144 kg |
| 5 lb | 2.268 kg |
| 6 lb | 2.7216 kg |
| 7 lb | 3.1751 kg |
| 8 lb | 3.6287 kg |
| 9 lb | 4.0823 kg |
| 10 lb | 4.5359 kg |
| 11 lb | 4.9895 kg |
| 12 lb | 5.4431 kg |
| 15 lb | 6.8039 kg |
| 16 lb | 7.2575 kg |
| 17 lb | 7.7111 kg |
| 20 lb | 9.0718 kg |
| 22 lb | 9.979 kg |
| 25 lb | 11.3398 kg |
| 30 lb | 13.6078 kg |
| 40 lb | 18.1437 kg |
| 42 lb | 19.0509 kg |
| 50 lb | 22.6796 kg |
| 55 lb | 24.9476 kg |
| 70 lb | 31.7515 kg |
| 75 lb | 34.0194 kg |
| 100 lb | 45.3592 kg |
| 110 lb | 49.8952 kg |
| 120 lb | 54.4311 kg |
| 130 lb | 58.967 kg |
| 150 lb | 68.0389 kg |
| 155 lb | 70.3068 kg |
| 200 lb | 90.7185 kg |
| 250 lb | 113.3981 kg |
| 275 lb | 124.7379 kg |
| 350 lb | 158.7573 kg |
| 500 lb | 226.7962 kg |
| 700 lb | 317.5147 kg |
| 1000 lb | 453.5924 kg |
Most-searched lb to kg answers
16 lb to kg
7.2575 kg10 lb to kg
4.5359 kg70 lb to kg
31.7515 kg1 lb to kg
0.4536 kg40 lb to kg
18.1437 kg155 lb to kg
70.3068 kg11 lb to kg
4.9895 kg5 lb to kg
2.268 kg22 lb to kg
9.979 kg3 lb to kg
1.3608 kg110 lb to kg
49.8952 kg12 lb to kg
5.4431 kgWhen to convert lb to kg
Use pounds to kilograms for body weight, gym loads, parcel declarations and airline baggage limits.
- ▸Compare a pound-labelled scale with a metric medical or fitness record.
- ▸Check luggage and shipping weights before entering a kilogram value.
Common mistakes
- ✕This page uses the avoirdupois pound. One pound is exactly 0.45359237 kilograms.
- ✕Confusing pounds (lb) with pound-force or with the British stone (1 st = 14 lb).
- ✕Rounding too aggressively — 1 lb = 0.4536 kg, not 0.45 kg; the error compounds on large weights.
- ✕Using US "cups" for solid weight — cups are a volume unit, not a mass unit.
- ✕Short ton, long ton and tonne are three different units. A US short ton is 2000 lb = 907.18474 kg. A UK long ton is 2240 lb = 1016.0469088 kg. A metric tonne is 1000 kg. Freight and commodity figures are wrong by up to 12% if these are mixed up.
Regional usage & source
Kilograms and grams are the global standard for mass. Pounds and ounces remain common in the US. The UK still uses stone (1 st = 14 lb) for body weight in everyday speech.
Reference: 1 pound (avoirdupois) = exactly 0.45359237 kilograms per the 1959 international yard and pound agreement (NIST Handbook 44).
How these numbers are produced and rounded: methodology.