Grams to Kilograms
Convert grams to kilograms instantly. 1 g = 0.001 kg. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert grams to kilograms
To convert grams to kilograms, divide by 1,000 (multiply by 0.001). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
kg = g × 0.001
Grams to Kilograms conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Grams | Kilograms |
|---|---|
| 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 |
| 500 g | 0.5 kg |
| 1,000 g | 1 kg |
What is a gram?
A thousandth of a kilogram, and the practical unit for cooking by weight.
What is a kilogram?
The SI base unit of mass, defined since 2019 by the Planck constant.
The formula
kg = g × 0.001
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Grams to Kilograms
- Type the number of grams you want to convert.
- Read the result in kilograms straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked kilograms to grams page.
Grams to Kilograms — frequently asked questions
How many kilograms are in a gram?
One gram equals 0.001 kg. kg = g × 0.001
What is the formula to convert grams to kilograms?
The formula is kg = g × 0.001. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert kilograms back to grams?
Divide instead of multiplying: one kilogram is 1,000 g. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this grams to kilograms free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 15, 2026 · Calculation runs client-side · No data collected · Report an error