Units of Mass
19 units of mass in the database, across 10 measurement systems, each with its exact or best-known SI value.
| Unit | Symbol | Quantity | Value in SI |
|---|---|---|---|
| Kilogram | kg | Mass | Base unit; h = 6.62607015 × 10⁻³⁴ J·s exactly |
| Tonne | t | Mass | 1 t = 1000 kg (exact) |
| Metric carat | ct | Mass | 1 ct = 200 mg (exact) |
| Pound | lb | Mass | 0.45359237 kg (exact) |
| Ounce | oz | Mass | 28.349523125 g (exact) |
| Grain | gr | Mass | 64.79891 mg (exact) |
| Stone | st | Mass | 6.35029318 kg (14 lb, exact) |
| Long hundredweight | cwt | Mass | 50.80234544 kg (112 lb, exact) |
| Long ton | LT | Mass | 1016.0469088 kg (2240 lb, exact) |
| Short ton | tn | Mass | 907.18474 kg (2000 lb, exact) |
| Troy ounce | oz t | Mass | 31.1034768 g (480 grains, exact) |
| Troy pound | lb t | Mass | 373.2417216 g (5760 grains, exact) |
| Pennyweight | dwt | Mass | 1.55517384 g (24 grains, exact) |
| Dalton | Da | Mass | 1/12 of a carbon-12 atom ≈ 1.66054 × 10⁻²⁷ kg |
| Kan | 貫 | Mass | 3.75 kg (exact) |
| Jin | 斤 | Mass | 500 g (mainland China) |
| Tola | tola | Mass | 180 grains = 11.6638038 g |
| Pood | пуд | Mass | ≈ 16.3807 kg (40 funt) |
| Roman pound | libra | Mass | ≈ 327 g |