About the g to t calculation
One gram is exactly 0.000001 tonnes, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The everyday cooking and food-labelling unit in metric countries. A metric tonne is exactly 1,000 kg — not the same as a US or imperial ton.
Formula
t = g × 0.000001
1 g = 0.000001 t
1 t = 1,000,000 gWorked example
To convert 500 g, multiply by 0.000001: 500 × 0.000001 = 0.0005 t.
Frequently asked questions
How many tonnes are in a gram?
There are 0.000001 tonnes in one gram. To convert any amount, multiply the number of grams by 0.000001.
How do I convert tonnes back to grams?
Divide instead of multiplying, or equivalently multiply by 1,000,000. One tonne is 1,000,000 grams.
Is this conversion exact?
Yes. Since the international agreement of 1959, the relationship between grams and tonnes is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.
Where is each of these units used?
Grams: the everyday cooking and food-labelling unit in metric countries. Tonnes: a metric tonne is exactly 1,000 kg — not the same as a US or imperial ton.
Sources
- NIST Special Publication 811 — Guide for the Use of the International System of Units