Tonnes to Kilograms
Convert tonnes to kilograms instantly — one tonne is 1000 kilograms.
| Tonnes | Kilograms |
|---|---|
| 1 t | 1000 kg |
| 2 t | 2000 kg |
| 3 t | 3000 kg |
| 5 t | 5000 kg |
| 10 t | 10000 kg |
| 25 t | 25000 kg |
| 50 t | 50000 kg |
| 100 t | 100000 kg |
How to use
- Enter a value in the Tonnes field.
- The Kilograms figure appears immediately — no button to press.
- Typing in the Kilograms field converts back to Tonnes the same way.
- Use the reference table for the values that come up most often.
Tonnes to Kilograms formula
The factor from tonnes to kilograms is 1000.
kg = t × 1000
Put another way, one tonne is exactly 1,000 kilograms.
Why this factor: the tonne and the kilogram are both defined against the kilogram, so dividing one definition by the other gives 1000 directly. Both definitions are set out in full below.
To go the other way, divide by 1000 — or use the Kilograms to Tonnes converter, which is the same calculation reversed.
Worked example
Start with 25 t. Multiply by 1000 to get 25000 kg.
25 t × 1000 = 25000 kg
The converter above does this for any value you type, in either direction.
What is a tonne?
A tonne, or metric ton, is 1,000 kilograms — the standard unit for bulk freight and industrial quantities.
Definition: Exactly 1,000 kilograms. Accepted for use with SI but not itself an SI unit.
Where it is used: Shipping and freight, steel and cement output, vehicle masses, and carbon emissions accounting.
Worth knowing: Distinct from the US short ton (2,000 lb ≈ 907 kg) and the UK long ton (2,240 lb ≈ 1,016 kg).
What is a kilogram?
The kilogram is the SI base unit of mass — the reference for every other mass unit.
Definition: Since 2019 the kilogram has been defined by fixing the Planck constant at exactly 6.62607015×10⁻³⁴ joule-seconds, retiring the physical platinum-iridium cylinder that defined it for 130 years.
Where it is used: Universal in science, trade and everyday weighing outside the United States.
Tonnes vs Kilograms
The tonne is a metric unit while the kilogram is an SI unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many kilograms are in a tonne?
One tonne equals 1000 kilograms.
What is the formula to convert tonnes to kilograms?
Multiply the number of tonnes by 1000. To reverse it, divide by 1000 instead.
How do I convert kilograms back to tonnes?
Divide by 1000, which is the same as multiplying by 0.001.
How many kilograms are in 10 tonnes?
10 t works out to 10000 kg.
Is there anything to watch out for with tonnes?
Distinct from the US short ton (2,000 lb ≈ 907 kg) and the UK long ton (2,240 lb ≈ 1,016 kg).
How is the tonne defined?
Exactly 1,000 kilograms. Accepted for use with SI but not itself an SI unit.