Convert kilograms to grams
1 kg = 1000 g
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How many grams are in a kilogram?
One kilogram is 1000 grams. To convert any amount, multiply by 1000. Going the other way, one gram is 0.001 kilograms.
What is the formula to convert kg to g?
Multiply the kilogram figure by 1000. So g = kg × 1000. For a quick mental estimate, multiplying by about 1000 gets you within a percent or so, which is close enough for most everyday purposes.
What does a kilogram actually look like?
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.
And what is a gram?
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.
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 kg before converting introduces an error the conversion then multiplies.
About kg to g
How to convert kilograms to grams
Multiply by 1000. One kilogram is 1000 grams, and one gram is 0.001 kilograms.
g = kg × 1000
Worked example
10 kg = 10000 g. For a sense of scale, one kilogram is a litre of water, near enough, and one gram is about the mass of a paperclip.
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.
About the gram
The gram is the unit of nutrition labels and recipes worldwide, and of postal rates in most of the metric world.
Quick reference
| kilograms | grams |
|---|---|
| 1 kg | 1000 g |
| 2 kg | 2000 g |
| 5 kg | 5000 g |
| 10 kg | 10000 g |
| 25 kg | 25000 g |
| 50 kg | 50000 g |
| 100 kg | 100000 g |
| 1000 kg | 1000000 g |
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 kg to a whole number before converting introduces an error that the conversion then multiplies.
Other weight & mass conversions
Convert grams back to kilograms, or pick any other pair with the full unit converter. Related: kg to lb, kg to oz, kg to t.