How to convert grams to kilograms
One gram equals 0.001 kilograms, so multiply the number of grams by 0.001:
kg = g × 0.001
g = kg ÷ 0.001 (1 kg = 1,000 g)
Example: 100 g → 100 × 0.001 = 0.1 kg.
Going the other way, divide by 0.001, or multiply by 1,000; the kilograms to grams converter does it for you.
Everyday values
| Grams | Kilograms | For example |
|---|---|---|
| 100 g | 0.1 kg | a nutrition-label serving |
| 250 g | 0.25 kg | a pack of butter |
| 500 g | 0.5 kg | half a kilo |
| 1,000 g | 1 kg | one kilogram |
| 2,000 g | 2 kg | two kilograms |
When you need this conversion
Divide grams by 1,000 to get kilograms. Postal and luggage weight limits are given in kilograms, while kitchen scales and food labels use grams.
Gram to kilogram conversion table
| g | kg | g | kg |
|---|---|---|---|
| 100 g | 0.1 kg | 1,300 g | 1.3 kg |
| 200 g | 0.2 kg | 1,400 g | 1.4 kg |
| 300 g | 0.3 kg | 1,500 g | 1.5 kg |
| 400 g | 0.4 kg | 1,600 g | 1.6 kg |
| 500 g | 0.5 kg | 1,700 g | 1.7 kg |
| 600 g | 0.6 kg | 1,800 g | 1.8 kg |
| 700 g | 0.7 kg | 1,900 g | 1.9 kg |
| 800 g | 0.8 kg | 2,000 g | 2 kg |
| 900 g | 0.9 kg | 2,100 g | 2.1 kg |
| 1,000 g | 1 kg | 2,200 g | 2.2 kg |
| 1,100 g | 1.1 kg | 2,300 g | 2.3 kg |
| 1,200 g | 1.2 kg | 2,400 g | 2.4 kg |
About the units
- Gram (g): one thousandth of a kilogram.
- Kilogram (kg): the SI base unit of mass, defined through the Planck constant since 2019.
Both are units of weight (mass). The conversion factor comes from the exact definitions above, so the calculator is exact; results are only rounded for display (up to six significant digits).
Frequently asked questions
How many kilograms are in one gram?
One gram is 0.001 kilograms. One kilogram is 1,000 grams.
How do I convert grams to kilograms?
Multiply the value in grams by 0.001. To go back, divide by 0.001.
What is 100 g in kilograms?
100 g = 0.1 kg.
What is 250 g in kilograms?
250 g = 0.25 kg.
Sources
- NIST Special Publication 811 (2008), Guide for the Use of the International System of Units (SI), Appendix B: conversion factors.
- NIST Handbook 44 (2024), Appendix C: General tables of units of measurement.
Last reviewed 5 October 2026. Results are estimates; see our disclaimer.