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Grams to kilograms (g to kg)

To convert grams to kilograms (g to kg): one gram is 0.001 kilograms, so 1,000 g is 1 kg.

Swap units: kg to g

In kilograms1 kg

Conversion factor Exact by definition: within the metric system every step is a power of ten.
1 gram = 0.001 kilograms
The other way
1 kilogram = 1,000 grams
Working
1,000 x 0.001 = 1
1,000 g in every unit
1,000,000 mg 1,000 g 1 kg 0.001 t 35.274 oz 2.2046 lb 0.15747 st 0.0011023 ton 15,432 gr 643.01 dwt 32.151 oz t 2.6792 lb t
grams to kilograms
gkg
10.001
20.002
50.005
100.01
250.025
500.05
1000.1

How the Unit Converter works

One gram is exactly 0.001 kilograms. That is the meaning of the metric prefixes, not a measurement: milli is a thousandth, centi a hundredth and kilo a thousand, so every conversion inside the metric system is a power of ten and nothing has to be looked up.

Worked through: 500 g x 0.001 = 0.5 kg.

Going the other way, one kilogram is 1,000 grams.

To convert without a calculator, multiply by 0.001. Rounding that to 0.001 is within 0% for most purposes.

A decimal shift rather than a conversion: the kilogram is the base SI unit and the gram is a thousandth of it. Unusually, the prefixed form is the base unit here, a historical quirk of the 1795 definition.

Precision is worth matching to the input. A measurement given as 1 g carries one or two significant figures, and reporting its conversion to six implies a precision the original never had.

Unit Converter FAQ

How many kilograms are in a gram?

0.001. That is exact by definition: metric prefixes are powers of ten.

What is 1,000 g in kilograms?

1 kg. Multiply by 0.001: 500 g x 0.001 = 0.5 kg.

How do I convert kilograms back to grams?

Divide by 0.001, or equivalently multiply by 1,000. One kilogram is 1,000 grams. The two factors are reciprocals, so you only need to remember one of them.

Is there anything to watch out for with this conversion?

A decimal shift rather than a conversion: the kilogram is the base SI unit and the gram is a thousandth of it. Unusually, the prefixed form is the base unit here, a historical quirk of the 1795 definition.

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