Convert grams to kilograms
1 g = 0.001 kg
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All unit convertersQuestions
How many kilograms are in a gram?
One gram is 0.001 kilograms. To convert any amount, multiply by 0.001. Going the other way, one kilogram is 1000 grams.
What is the formula to convert g to kg?
Multiply the gram figure by 0.001. So kg = g × 0.001. For a quick mental estimate, dividing by about 1000 gets you close enough for most everyday purposes.
What does a gram actually look like?
One gram is about the mass of a paperclip. The gram is the unit of nutrition labels and recipes worldwide, and of postal rates in most of the metric world.
And what is a kilogram?
One kilogram is a litre of water, near enough. The kilogram was redefined in 2019 in terms of the Planck constant, retiring the platinum-iridium cylinder in Paris that had defined it since 1889.
Is this conversion exact?
Yes. Since the 1959 international yard and pound agreement, the imperial and metric systems are related by exact definitions rather than measurements — the inch is exactly 25.4 mm and the pound exactly 0.45359237 kg. Everything derived from those, including this conversion, is therefore exact. Round at the end rather than partway through, since rounding g before converting introduces an error the conversion then multiplies.
About g to kg
How to convert grams to kilograms
Multiply by 0.001. One gram is 0.001 kilograms, and one kilogram is 1000 grams.
kg = g × 0.001
Worked example
10 g = 0.01 kg. For a sense of scale, one gram is about the mass of a paperclip, and one kilogram is a litre of water, near enough.
About the gram
The gram is the unit of nutrition labels and recipes worldwide, and of postal rates in most of the metric world.
About the kilogram
The kilogram was redefined in 2019 in terms of the Planck constant, retiring the platinum-iridium cylinder in Paris that had defined it since 1889.
Quick reference
| grams | kilograms |
|---|---|
| 1 g | 0.001 kg |
| 2 g | 0.002 kg |
| 5 g | 0.005 kg |
| 10 g | 0.01 kg |
| 25 g | 0.025 kg |
| 50 g | 0.05 kg |
| 100 g | 0.1 kg |
| 1000 g | 1 kg |
Getting it right
This conversion is exact by definition, so the only limit on accuracy is how many digits you keep. Round at the end rather than partway through — rounding g to a whole number before converting introduces an error that the conversion then multiplies.
Other weight & mass conversions
Convert kilograms back to grams, or pick any other pair with the full unit converter. Related: g to lb, g to oz, g to t.