Convert Kilograms to Tonnes
1 kilogram is 0.001 t. One kilogram is exactly 0.001 tonnes.
One kilogram is 0.001 tonnes. To convert kilograms to tonnes, multiply by 0.001; to go the other way, divide by 0.001 or multiply by 1000. The factor is exact rather than rounded: it follows from NIST Handbook 44. The SI base unit of mass, defined since 2019 by fixing the Planck constant rather than by a metal cylinder in Paris.
Factor checked against the defining standard · How we check
- Kilograms × 0.001
1 * 0.0010.001 t
1 kilogram in every weight unit
| Unit | Value | Exact factor |
|---|---|---|
| ounces | 35.27396195 oz | × 35.2739619496 |
| pounds | 2.204622622 lb | × 2.20462262185 |
| stone | 0.1574730444 st | × 0.157473044418 |
| US tons | 0.001102311311 ton | × 0.00110231131092 |
| micrograms | 1,000,000,000 mcg | × 1,000,000,000 |
| milligrams | 1,000,000 mg | × 1,000,000 |
| centigrams | 100,000 cg | × 100,000 |
| grams | 1,000 g | × 1,000 |
| kilograms (as entered) | 1 kg | — |
| slugs | 0.06852176586 slug | × 0.0685217658568 |
| tonnes | 0.001 t | × 0.001 |
| carats | 5,000 ct | × 5,000 |
| troy ounces | 32.15074657 ozt | × 32.1507465686 |
| grains | 15,432.35835 gr | × 15,432.3583529 |
| long tons | 0.0009842065276 LT | × 0.000984206527611 |
Factors are entered by hand from NIST Handbook 44 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert kilograms to tonnes? The converter and the working
- 1.Take the measurement in kilograms.
- 2.Multiply by 0.001 — that is how many tonnes fit in one kilogram.
- 3.To go back the other way, divide by 0.001, or multiply by 1000.
Worked example: 25 kilograms to tonnes
- Formula
- kg × 0.001 = t
- Arithmetic
- 25 × 0.001 = 0.03 t
- Answer
- 25 kg = 0.03 t
The factor is exact, so this figure is exact too — only the display is rounded.
Kilograms to tonnes conversion table
| Kilograms | Tonnes |
|---|---|
| 1 kg | 0.001 t |
| 2 kg | 0.002 t |
| 3 kg | 0.003 t |
| 4 kg | 0.004 t |
| 5 kg | 0.01 t |
| 6 kg | 0.01 t |
| 7 kg | 0.01 t |
| 8 kg | 0.01 t |
| 9 kg | 0.01 t |
| 10 kg | 0.01 t |
| 12 kg | 0.01 t |
| 15 kg | 0.02 t |
| 20 kg | 0.02 t |
| 25 kg | 0.03 t |
| 50 kg | 0.05 t |
| 100 kg | 0.1 t |
| 200 kg | 0.2 t |
| 300 kg | 0.3 t |
| 500 kg | 0.5 t |
| 1000 kg | 1 t |
| 2000 kg | 2 t |
| 5000 kg | 5 t |
| 10000 kg | 10 t |
A tonne is a megagram, and two other tons are close enough to be confused
The tonne is exactly 1,000 kg — the SI name for it is the megagram, which nobody uses. The US short ton is 907.18474 kg and the British long ton is 1,016.0469 kg, so the three sit within about 10% of each other and a freight or emissions figure is ambiguous without the spelling. "Tonne" and "metric ton" always mean 1,000 kg; a bare "ton" in an American source means the short ton.
NIST Handbook 44, Appendix C — general tables of units of measurement
What is a kilogram?
The SI base unit of mass, defined since 2019 by fixing the Planck constant rather than by a metal cylinder in Paris.
What is a tonne?
One thousand kilograms, also called the metric ton — 2,204.6 pounds.
How many tonnes are in a kilogram?
One kilogram is 0.001 tonnes, exactly. Going the other way, one tonne is 1000 kilograms. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every weight unit here
The whole group — 15 units with their symbols and the size of each one in kilograms — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a kilogram.
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Questions people actually ask
- How many tonnes are in a kilogram?
- 0.001. One thousand kilograms, also called the metric ton — 2,204.6 pounds.
- How do I convert tonnes back to kilograms?
- Divide by 0.001, or multiply by 1000 — they are the same operation.
Other weight conversions
Tonnes to kilograms — the same conversion the other way.