This converter turns kilograms into tonnes instantly, using the exact factor 1 kilogram = 0.001 tonnes. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
The SI base unit of mass, redefined in 2019 in terms of the Planck constant. The metric ton: exactly 1,000 kilograms, used for freight and vehicle mass.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
kilograms- The amount you are converting, measured in kilograms
0.001- The exact number of tonnes in one kilogram
tonnes- The converted result
How it works, step by step
- Enter the number of kilograms you want to convert.
- The value is multiplied by 0.001, the exact conversion factor.
- The result is displayed in tonnes, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 kilograms
Multiply 5 by 0.001. That gives 0.005 tonnes. A quick sanity check: one kilogram is smaller than one tonne, so the number should get smaller — and it does.
Converting 72 kilograms
72 × 0.001 = 0.072 tonnes. Working backwards, 0.072 ÷ 0.001 returns 72 kilograms, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many tonnes are in one kilogram?
Exactly 0.001. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert kilograms to tonnes?
Tonnes = kilograms × 0.001. To reverse it, divide instead: kilograms = tonnes ÷ 0.001, which is the same as multiplying by 1000.
Is the kilogram bigger than the tonne?
No. One kilogram is only 0.001 of a tonne, so the tonne is the larger unit.
Why does my answer differ slightly from other kg to tonnes converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a kilogram?
The SI base unit of mass, redefined in 2019 in terms of the Planck constant.
What is a tonne?
The metric ton: exactly 1,000 kilograms, used for freight and vehicle mass.
Kilograms to tonnes reference table
| Kilograms | Tonnes |
|---|---|
| 0.5 kg | 0.0005 t |
| 1 kg | 0.001 t |
| 2 kg | 0.002 t |
| 3 kg | 0.003 t |
| 5 kg | 0.005 t |
| 10 kg | 0.01 t |
| 15 kg | 0.015 t |
| 20 kg | 0.02 t |
| 25 kg | 0.025 t |
| 50 kg | 0.05 t |
| 75 kg | 0.075 t |
| 100 kg | 0.1 t |
| 250 kg | 0.25 t |
| 500 kg | 0.5 t |
| 1000 kg | 1 t |
Exact factor: 1 kilogram = 0.001 tonnes. Values rounded for display.