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