Weight and mass converter
Enter a weight in any unit and get the equivalent in all others — metric, imperial, and avoirdupois.
Result
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All units
How it works
The converter uses gram as the base unit. Every input unit is first converted to grams using its exact definition, then the result is divided by the target unit’s gram equivalent.
For example, 1 kilogram = 1,000 grams; 1 pound = 453.59237 grams (the exact NIST definition). So 5 kg = 5,000 g ÷ 453.59237 = 11.0231 lb.
Unit reference
| Unit | Symbol | Exact gram equivalent |
|---|---|---|
| Milligram | mg | 0.001 g |
| Gram | g | 1 g |
| Kilogram | kg | 1,000 g |
| Metric ton | t | 1,000,000 g |
| Ounce (av.) | oz | 28.349523125 g |
| Pound (av.) | lb | 453.59237 g |
| Stone | st | 6,350.29318 g |
| US short ton | ton | 907,184.74 g |
| Long ton | lt | 1,016,046.909 g |
Frequently asked
How many pounds in a kilogram?
One kilogram equals approximately 2.20462 pounds. This is the exact conversion used by the NIST.
What is a stone in kilograms?
One stone is exactly 14 pounds, which equals approximately 6.35029 kilograms. Stone is used mainly in the UK and Ireland for body weight.
How many ounces in a pound?
Exactly 16 avoirdupois ounces in one pound.
What is the difference between a metric ton and a US ton?
A metric ton (tonne) is 1,000 kg (2,204.6 lb). A US short ton is 2,000 lb (907.2 kg). A long ton (UK) is 2,240 lb (1,016 kg).
How do I share my conversion?
Click "Share with my numbers" to copy a URL that restores your exact value and units when opened.
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