Weight converter
Convert pounds, ounces, stone and tons to kilograms and grams, and back.
- ๐บ๐ธ US federal & state rules
- NIST SP 811 conversion factors
- See sources
lb to kg
68.0388555 kg
150 lb = 68.0388555 kg
- 1 lb
- 0.45359237 kg
- 1 kg
- 2.204622622 lb
Results are rounded to 10 significant digits.
Common values, lb to kg
| 0.5 lb | 0.226796 kg |
|---|---|
| 1 lb | 0.453592 kg |
| 2 lb | 0.907185 kg |
| 3 lb | 1.36078 kg |
| 4 lb | 1.81437 kg |
| 5 lb | 2.26796 kg |
| 10 lb | 4.53592 kg |
| 12 lb | 5.44311 kg |
| 20 lb | 9.07185 kg |
| 25 lb | 11.3398 kg |
| 50 lb | 22.6796 kg |
| 100 lb | 45.3592 kg |
| 1,000 lb | 453.592 kg |
150 lb in every unit
| Ounces (oz) | 2,400 oz |
|---|---|
| Pounds (lb) | 150 lb |
| Stone (st) | 10.71428571 st |
| Short tons (US ton) | 0.075 US ton |
| Troy ounces (oz t) | 2,187.5 oz t |
| Milligrams (mg) | 68,038,855.5 mg |
| Grams (g) | 68,038.8555 g |
| Kilograms (kg) | 68.0388555 kg |
| Metric tons (t) | 0.0680388555 t |
Show the math
| To kg | 150 lb ร 0.45359237 = 68.0388555 kg |
|---|---|
| To kg | 68.0388555 kg รท 1 = 68.0388555 kg |
What to do next
How it works
Everything goes through kilograms. The pound is defined as exactly 0.45359237 kg, the ounce is 1/16 of a pound, the stone is 14 pounds and the US short ton is 2,000 pounds.
Things to keep in mind
Gold and silver prices are quoted in troy ounces (31.1035 g), not regular ounces. A metric ton (1,000 kg) is about 10% heavier than a US short ton.
Conversion factors
| 1 lb equals | Value |
|---|---|
| Ounces (oz) | 16 oz |
| Stone (st) | 0.07142857143 st |
| Short tons (US ton) | 0.0005 US ton |
| Troy ounces (oz t) | 14.58333333 oz t |
| Milligrams (mg) | 453,592.37 mg |
| Grams (g) | 453.59237 g |
| Kilograms (kg) | 0.45359237 kg |
| Metric tons (t) | 0.00045359237 t |
Sources
Rules applied as of 2026-10-19. See the sources below for details.
- NIST SP 811, Appendix B.8: Factors for units listed alphabeticallyChecked 2026-10-19
- NIST: U.S. survey foot retired (acre now uses the international foot)Checked 2026-10-19
Frequently asked questions
How many kilograms is a pound?
One pound is exactly 0.45359237 kg. To go from lbs to kg, divide by about 2.2046. So 150 lb is about 68.04 kg.
How many ounces are in a pound?
16. One ounce is 28.35 g, so a pound is about 453.6 g.
What is a stone?
A British unit equal to 14 pounds, or about 6.35 kg. A 160 lb person weighs 11 stone 6 lb.
Is a fluid ounce the same as an ounce?
No. An ounce measures weight and a fluid ounce measures volume. A fluid ounce of water weighs about 1.04 oz.