Grams to Tonnes Converter
Convert grams to metric tonnes — divide by a million. Results update as you type; exact factors shown.
One gram is 0 tonne (metric ton) — see the exact factor, not a rounded rule of thumb.
How the grams to tonnes 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 |
|---|---|---|
| 1,000 g | 0.001 t | grams to tonne (metric ton) |
| 10,000 g | 0.01 t | grams to tonne (metric ton) |
| 100,000 g | 0.1 t | grams to tonne (metric ton) |
| 500,000 g | 0.5 t | grams to tonne (metric ton) |
| 1,000,000 g | 1 t | grams to tonne (metric ton) |
| 2,000,000 g | 2 t | grams to tonne (metric ton) |
| 5,000,000 g | 5 t | grams to tonne (metric ton) |
| 10,000,000 g | 10 t | grams to tonne (metric ton) |
| 25,000,000 g | 25 t | grams to tonne (metric ton) |
| 50,000,000 g | 50 t | grams to tonne (metric ton) |
| 100,000,000 g | 100 t | grams to tonne (metric ton) |
| 1,000,000,000 g | 1,000 t | grams to tonne (metric ton) |
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 grams in a tonne?
Exactly 1,000,000.
What is 500,000 g in tonnes?
0.5 tonnes.
Is a tonne 1,000 kg?
Yes, exactly — which is a million grams.
How do I convert grams to tonnes?
Move the decimal point six places left.
What is 1,000 g?
One kilogram, or 0.001 tonnes.
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.