About the g to kg calculation
One gram is exactly 0.001 kilograms, 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. The SI base unit of mass, and how bodyweight is quoted in most of the world.
Formula
kg = g × 0.001
1 g = 0.001 kg
1 kg = 1,000 gWorked example
To convert 500 g, multiply by 0.001: 500 × 0.001 = 0.5 kg.
Frequently asked questions
How many kilograms are in a gram?
There are 0.001 kilograms in one gram. To convert any amount, multiply the number of grams by 0.001.
How do I convert kilograms back to grams?
Divide instead of multiplying, or equivalently multiply by 1,000. One kilogram is 1,000 grams.
Is this conversion exact?
Yes. Since the international agreement of 1959, the relationship between grams and kilograms 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. Kilograms: the SI base unit of mass, and how bodyweight is quoted in most of the world.
Sources
- NIST Special Publication 811 — Guide for the Use of the International System of Units