Tonnes to KG Converter
Convert metric tonnes to kilograms — a thousand kilograms to the tonne. Results update as you type; exact factors shown.
One tonne (metric ton) is 1,000 kilograms — see the exact factor, not a rounded rule of thumb.
How the tonnes to kg converter works
Mass converts through the kilogram. The avoirdupois pound has been exactly 0.45359237 kg since 1959, so an ounce is 28.349523125 g and a stone (14 lb) is 6.35029318 kg. A US short ton is 2,000 lb; an imperial long ton is 2,240 lb; a metric tonne is 1,000 kg.
The UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
Common mass conversions
| From | To | Units |
|---|---|---|
| 0.1 t | 100 kg | tonne (metric ton) to kilograms |
| 0.5 t | 500 kg | tonne (metric ton) to kilograms |
| 1 t | 1,000 kg | tonne (metric ton) to kilograms |
| 1.5 t | 1,500 kg | tonne (metric ton) to kilograms |
| 2 t | 2,000 kg | tonne (metric ton) to kilograms |
| 3 t | 3,000 kg | tonne (metric ton) to kilograms |
| 5 t | 5,000 kg | tonne (metric ton) to kilograms |
| 10 t | 10,000 kg | tonne (metric ton) to kilograms |
| 20 t | 20,000 kg | tonne (metric ton) to kilograms |
| 25 t | 25,000 kg | tonne (metric ton) to kilograms |
| 50 t | 50,000 kg | tonne (metric ton) to kilograms |
| 100 t | 100,000 kg | tonne (metric ton) to kilograms |
Units in this converter and their exact factors
| Unit | Symbol | One unit in kilograms |
|---|---|---|
| milligram | mg | 0.000001 kilogram |
| gram | g | 0.001 kilogram |
| kilogram | kg | 1 kilogram |
| tonne (metric ton) | t | 1,000 kilogram |
| ounce | oz | 0.0283495231 kilogram |
| pound | lb | 0.45359237 kilogram |
| stone | st | 6.35029318 kilogram |
| US ton (short) | US ton | 907.18474 kilogram |
| imperial ton (long) | long ton | 1,016.0469088 kilogram |
FAQFrequently asked questions about mass conversion
How many kg in a tonne?
Exactly 1,000.
Is a tonne the same as a ton?
No. A metric tonne is 1,000 kg; a US short ton is 907.2 kg and a UK long ton 1,016 kg.
How heavy is a car?
A small hatchback is about 1.2 tonnes; a large SUV can exceed 2.5.
What is a tonne of water?
Exactly one cubic metre, which is what makes the metric system convenient.
How do I write it?
"Tonne" for metric, "ton" for imperial — and "metric ton" where the difference matters.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.