Mass Converter
Convert units of mass commonly used for weight, including kilograms, grams, pounds, ounces, stones, tonnes, US and UK tons, and laboratory metric units.
This calculator is useful when you need a quick unit check without working through each conversion factor by hand. Enter one value to compare every supported unit side by side.
Mass Converter
Enter a mass and choose its starting unit. The table lists metric and laboratory units first, followed by US and UK mass units.
| Unit | Symbol | Conversion factor | 1 g = |
|---|---|---|---|
| metric tonne | t | 1 t = 1 × 106 g | 1 × 10−6t |
| kilogram | kg | 1 kg = 1,000 g | 0.001kg |
| gram | g | 1 g = 1 g | 1g |
| milligram | mg | 1 mg = 0.001 g | 1,000mg |
| microgram | µg (mcg) | 1 µg = 1 × 10−6 g | 1 × 106µg |
| nanogram | ng | 1 ng = 1 × 10−9 g | 1 × 109ng |
| picogram | pg | 1 pg = 1 × 10−12 g | 1 × 1012pg |
| femtogram | fg | 1 fg = 1 × 10−15 g | 1 × 1015fg |
| attogram | ag | 1 ag = 1 × 10−18 g | 1 × 1018ag |
| ounce | oz | 1 oz = 28.349523 g | 0.035273962oz |
| pound | lb | 1 lb = 453.59237 g | 0.0022046226lb |
| stone | st | 1 st = 6,350.2932 g | 0.00015747304st |
| US short ton | US ton | 1 US ton = 907,184.74 g | 1.1023113 × 10−6US ton |
| UK long ton | UK ton | 1 UK ton = 1.0160469 × 106 g | 9.8420653 × 10−7UK ton |
Everyday and laboratory mass conversions
This converter includes everyday units such as pounds, ounces, stones, kilograms, and grams, along with milligrams, micrograms, nanograms, and other laboratory-scale metric units.
Compare all supported units
Enter a value and choose its starting unit to calculate the equivalent amount in every supported mass unit. The conversion table lets you compare metric, US customary, imperial, and laboratory units at the same time.
Mass converter or weight converter?
The kilograms, grams, pounds, ounces, and other units used by this calculator are treated as units of mass. In everyday language, these measurements are also commonly described as weight. For a more detailed explanation of the scientific distinction, read Mass vs. Weight: What's the Difference?.
Mass conversion examples
- 1 pound equals 16 ounces or 453.59237 grams.
- 1 kilogram equals 1,000 grams or approximately 2.20462 pounds.
- 1 milligram equals 1,000 micrograms or 1,000,000 nanograms.