Convert g to kg
Convert g to kg instantly. 1 g = 0.001 kg. Formula, worked examples and a quick reference table.
Last updated
One gram equals 0.001 kilograms. To convert any number of grams to kilograms, multiply by 0.001.
The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.
Weight and mass conversions matter most in three places: shipping, where a rate band can turn on a single kilogram; cooking, where recipes cross between metric grams and imperial ounces; and personal weight, where Britain and Ireland use stones, the United States uses pounds, and everywhere else uses kilograms. Strictly these are mass units rather than weight units, and the distinction only bites in physics, where weight is a force measured in newtons.
g to kg formula
To go the other way, use gram = kilogram ÷ 0.001.
About these units
The gram is a thousandth of a kilogram. It is the base unit of nearly every recipe outside the US, and the reason kitchen scales beat cup measures for consistency.
Since 2019 the kilogram has been defined by the Planck constant rather than a metal cylinder in Paris, making it reproducible in any properly equipped laboratory.
Gram is also written gramme, grammes, grams, gm and gms. Kilogram is also written kilogramme, kilogrammes, kilograms, kilos, kilo and kgs.
Sources
g to kg conversion table
| Gram | Kilogram |
|---|---|
| 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 |
| 25 g | 0.025 kg |
| 50 g | 0.05 kg |
| 100 g | 0.1 kg |
| 250 g | 0.25 kg |
| 500 g | 0.5 kg |
| 1,000 g | 1 kg |
Frequently asked questions
How many kilograms are in a gram? +
There are 0.001 kilograms in one gram.
What is 10 g in kg? +
10 g equals 0.01 kg. Multiply 10 by 0.001.
How do I convert kilogram back to gram? +
Use gram = kilogram ÷ 0.001. The converter above handles both directions, or see our dedicated kg to g page.
How accurate is this gram to kilogram conversion? +
The factor used is 0.001, carried at full double precision. Where a unit has an exact legal definition the factor is exact rather than approximate. Rounding is applied only to the displayed result, so the answer is never a calculation done on an already-rounded number.
Is there a quick way to estimate g to kg in my head? +
Divide by 1,000. That matches the true factor of 0.001 exactly, so no adjustment is needed for a mental estimate.