Weight Converter
Convert pounds, ounces, stone and tons to kilograms, grams and tonnes, plus troy ounces, grains and carats.
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In Every Unit
| Unit | Value |
|---|
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How to Convert Weight Units
The pound has been defined as exactly 0.45359237 kilograms since 1959. An ounce is 1/16 of a pound, a stone is 14 pounds and a US ton is 2,000 pounds.
kg = lb × 0.45359237 g = oz × 28.349523125
Worked Example
Common Conversions
| From | Equals |
|---|---|
| 1 lb | 0.4535924 kg |
| 1 kg | 2.204623 lb |
| 1 oz | 28.34952 g |
| 1 g | 0.03527396 oz |
| 1 st | 6.350293 kg |
| 1 ton | 0.9071847 t |
| 1 oz t | 31.10348 g |
Unit Definitions
| Unit | Equals | Exact? |
|---|---|---|
| Micrograms (µg) | 1 × 10⁻⁹ kg | Exact |
| Milligrams (mg) | 0.000001 kg | Exact |
| Grams (g) | 0.001 kg | Exact |
| Kilograms (kg) | 1 kg | Exact |
| Metric tons (tonnes) (t) | 1,000 kg | Exact |
| Grains (gr) | 0.00006479891 kg | Exact |
| Carats (ct) | 0.0002 kg | Exact |
| Ounces (oz) | 0.02834952313 kg | Exact |
| Pounds (lb) | 0.45359237 kg | Exact |
| Stone (st) | 6.35029318 kg | Exact |
| US short tons (ton) | 907.18474 kg | Exact |
| UK long tons (long ton) | 1,016.046909 kg | Exact |
| Troy ounces (oz t) | 0.0311034768 kg | Exact |
| Pennyweights (dwt) | 0.00155517384 kg | Exact |
Factors follow NIST Special Publication 811, Appendix B. "Exact" means the unit is defined as that value; results are rounded only for display.
Tips
Troy ounces (used for gold and silver) are about 10% heavier than ordinary ounces: 31.1035 g vs 28.3495 g. "Weight" here means mass, which is what scales report.