Grams to Kilograms Converter
Convert grams to kilograms instantly. Enter grams to get kilograms by dividing by 1000, with the reverse kilograms to grams direction shown.
Updated 2026-06-14 · Free · No sign-up · Runs privately in your browser
Show the formula & steps
How the Grams to Kilograms Converter Works
This tool converts grams (g) to kilograms (kg) and back. Both are metric units of mass. The kilogram is the SI base unit, and a gram is exactly one thousandth of a kilogram, so converting is just a matter of dividing or multiplying by 1000.
The Formula
Kilograms = grams ÷ 1000 Grams = kilograms × 1000
Because both units belong to the metric system, the conversion is exact and amounts to moving the decimal point three places.
Worked Example
Convert 2,500 grams to kilograms:
- Kilograms = 2,500 ÷ 1000 = 2.5 kg
A smaller amount, 500 grams:
- 500 ÷ 1000 = 0.5 kg
Going the other way, 3 kilograms in grams:
- Grams = 3 × 1000 = 3,000 g
Grams to Kilograms Quick Reference
| Grams | Kilograms |
|---|---|
| 100 | 0.1 |
| 500 | 0.5 |
| 1000 | 1 |
| 2500 | 2.5 |
| 5000 | 5 |
The Mental Shortcut
Because the factor is exactly 1000, you never need a calculator: just slide the decimal point three places to the left to go from grams to kilograms, or three places to the right to go the other way. So 1,750 g is 1.75 kg, and 4.2 kg is 4,200 g. This same pattern applies across the metric scale, from milligrams to tonnes.
Frequently asked questions
How many grams are in a kilogram?+
There are 1000 grams in one kilogram. So 2,500 grams equals 2.5 kilograms. To convert grams to kilograms, divide by 1000.
How do I convert grams to kilograms?+
Divide the gram value by 1000, or just move the decimal point three places to the left. For example, 2,500 g becomes 2.5 kg. To reverse it, multiply kilograms by 1000.
What is 500 grams in kilograms?+
500 grams equals 0.5 kilograms, which is half a kilogram. Dividing 500 by 1000 gives 0.5.
Is the gram to kilogram conversion exact?+
Yes. The kilogram is the SI base unit of mass and a gram is defined as exactly one thousandth of a kilogram, so the factor of 1000 involves no rounding.
How do I quickly convert grams to kg in my head?+
Just shift the decimal point three places left. 1,250 g becomes 1.25 kg, and 80 g becomes 0.08 kg. No multiplication is needed.