Convert Grams to Kilograms
Convert Grams to Kilograms instantly. 1 Gram (g) equals 0.001 Kilograms (kg).
Grams to Kilograms conversion table
| Grams (g) | Kilograms (kg) |
|---|---|
| 1 g | 0.001 kg |
| 2 g | 0.002 kg |
| 3 g | 0.003 kg |
| 5 g | 0.005 kg |
| 10 g | 0.01 kg |
| 20 g | 0.02 kg |
| 50 g | 0.05 kg |
| 100 g | 0.1 kg |
| 500 g | 0.5 kg |
| 1,000 g | 1 kg |
1 Gram = 0.001 Kilograms · multiply Grams by 0.001
About converting Grams to Kilograms
Grams (g) and Kilograms (kg) are both units of weight & mass, so converting between them is a single multiplication: multiply your Grams figure by 0.001. Ten Grams comes to 0.01 Kilograms, and a hundred works out at 0.1 Kilograms.
Rule of thumb: going from Grams to Kilograms divides, so the figure always shrinks — it takes about 1,000 Grams to make a single Kilogram. If your answer came out bigger, you have the conversion the wrong way round.
What is a Gram?
The gram sits oddly in SI: the kilogram, not the gram, is the official base unit of mass, which makes mass the only quantity whose base unit carries a prefix built into its name. The gram was defined in 1795 as the mass of a cubic centimetre of water at the melting point of ice — a definition that tied mass neatly to length and made the young metric system self-consistent. It survives as the working unit of nutrition labels, recipes, postage and laboratory work: anything small enough that kilograms would force you into decimals.
What is a Kilogram?
The kilogram was the last SI unit still defined by a physical object — the International Prototype Kilogram, a platinum-iridium cylinder kept in a vault near Paris since 1889. The problem was that it drifted. Careful comparisons against its official copies showed the masses diverging by tens of micrograms, and because the prototype simply was the kilogram by definition, there was no way to say which side had changed. In 2019 it was redefined in terms of the Planck constant, so any properly equipped lab can now realise a kilogram from physics rather than from an artefact.
To put both in perspective: a paperclip weighs about a gram, while a liter of water weighs about a kilogram.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Kilograms to Grams converter, or browse all Weight & Mass converters.
Frequently asked questions
How many Kilograms are in one Gram?
There are 0.001 Kilograms in one Gram.
How do I convert Grams to Kilograms?
Multiply the number of Grams by 0.001. For example, 10 Grams = 0.01 Kilograms.
What is 100 Grams in Kilograms?
100 Grams is equal to 0.1 Kilograms.
How do I convert Kilograms to Grams?
Multiply the Kilograms value by 1,000 (or divide by 0.001).
Is this Grams to Kilograms conversion exact?
Yes, exactly. Both units are fixed against the same base by definition, and 1 Gram = 0.001 Kilograms is the complete value — nothing is rounded away.
What is a Gram?
The gram sits oddly in SI: the kilogram, not the gram, is the official base unit of mass, which makes mass the only quantity whose base unit carries a prefix built into its name. The gram was defined in 1795 as the mass of a cubic centimetre of water at the melting point of ice — a definition that tied mass neatly to length and made the young metric system self-consistent. It survives as the working unit of nutrition labels, recipes, postage and laboratory work: anything small enough that kilograms would force you into decimals.
What is a Kilogram?
The kilogram was the last SI unit still defined by a physical object — the International Prototype Kilogram, a platinum-iridium cylinder kept in a vault near Paris since 1889. The problem was that it drifted. Careful comparisons against its official copies showed the masses diverging by tens of micrograms, and because the prototype simply was the kilogram by definition, there was no way to say which side had changed. In 2019 it was redefined in terms of the Planck constant, so any properly equipped lab can now realise a kilogram from physics rather than from an artefact.