The tonne (non-preferred SI derived unit; SI symbol: t), commonly referred to as the metric ton in the United States, is a non-SI metric unit of mass equal to 1,000 kilograms; or one megagram (Mg); it is equivalent to approximately 2,204.6 pounds, 1.10 short tons (US) or 0.984 long tons (imperial). Although not part of the SI per se, the tonne is "accepted for use with" SI units and prefixes by the International Committee for Weights and Measures, along with several other units like the bar, litre and day.
| Definition | Relation to SI units |
|---|---|
≡ 1000 kg |
| troy pound | petagram | short hundredweight | milligram | tonne | yottagram | stone | femtogram |
|---|---|---|---|---|---|---|---|
| 1 | 3.732417216 × 10-13 | 0.0082286 | 373,241.7216 | 0.0003732 | 3.732417216 × 10-22 | 0.0587755 | 3.732417216 × 1017 |
| 2 679 228 880 719 | 1 | 22,046,226,218.488 | 1.0 × 1018 | 1 000 000 000 | 1.0 × 10-9 | 157,473,044,417.77 | 1.0 × 1030 |
| 121.5277778 | 4.5359237 × 10-11 | 1 | 45 359 237 | 0.0453592 | 4.5359237 × 10-20 | 7.1428571 | 4.5359237 × 1019 |
| 2.679228880719 × 10-6 | 1.0 × 10-18 | 2.2046226218488 × 10-8 | 1 | 1.0 × 10-9 | 1.0 × 10-27 | 1.5747304441777 × 10-7 | 1 000 000 000 000 |
| 2,679.2288807 | 1.0 × 10-9 | 22.0462262 | 1 000 000 000 | 1 | 1.0 × 10-18 | 157.4730444 | 1.0 × 1021 |
| 2.679228880719 × 1021 | 1 000 000 000 | 2.2046226218488 × 1019 | 1.0 × 1027 | 1.0 × 1018 | 1 | 1.5747304441777 × 1020 | 1.0 × 1039 |
| 17.0138889 | 6.35029318 × 10-12 | 0.14 | 6,350,293.18 | 0.0063503 | 6.35029318 × 10-21 | 1 | 6.35029318 × 1018 |
| 2.679228880719 × 10-18 | 1.0 × 10-30 | 2.2046226218488 × 10-20 | 1.0 × 10-12 | 1.0 × 10-21 | 1.0 × 10-39 | 1.5747304441777 × 10-19 | 1 |
| Symbol | Definition |
|---|---|
| ≡ | exactly equal |
| ≈ | approximately equal to |
| = | equal to |
| digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |
| 1 tonnes | = 1000 kilograms |
| 2.5 tonnes | = 2500 kilograms |
| 4 tonnes | = 4000 kilograms |
| 5.5 tonnes | = 5500 kilograms |
| 7 tonnes | = 7000 kilograms |
| 8.5 tonnes | = 8500 kilograms |
| 10 tonnes | = 10000 kilograms |