This converter turns grams into kilograms instantly, using the exact factor 1 gram = 0.001 kilograms. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
One thousandth of a kilogram — the workhorse unit of cooking and postage. The SI base unit of mass, redefined in 2019 in terms of the Planck constant.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
grams- The amount you are converting, measured in grams
0.001- The exact number of kilograms in one gram
kilograms- The converted result
How it works, step by step
- Enter the number of grams you want to convert.
- The value is multiplied by 0.001, the exact conversion factor.
- The result is displayed in kilograms, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 grams
Multiply 5 by 0.001. That gives 0.005 kilograms. A quick sanity check: one gram is smaller than one kilogram, so the number should get smaller — and it does.
Converting 72 grams
72 × 0.001 = 0.072 kilograms. Working backwards, 0.072 ÷ 0.001 returns 72 grams, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many kilograms are in one gram?
Exactly 0.001. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert grams to kilograms?
Kilograms = grams × 0.001. To reverse it, divide instead: grams = kilograms ÷ 0.001, which is the same as multiplying by 1000.
Is the gram bigger than the kilogram?
No. One gram is only 0.001 of a kilogram, so the kilogram is the larger unit.
Why does my answer differ slightly from other grams to kg converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a gram?
One thousandth of a kilogram — the workhorse unit of cooking and postage.
What is a kilogram?
The SI base unit of mass, redefined in 2019 in terms of the Planck constant.
Grams to kilograms reference table
| Grams | Kilograms |
|---|---|
| 0.5 g | 0.0005 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 |
| 15 g | 0.015 kg |
| 20 g | 0.02 kg |
| 25 g | 0.025 kg |
| 50 g | 0.05 kg |
| 75 g | 0.075 kg |
| 100 g | 0.1 kg |
| 250 g | 0.25 kg |
| 500 g | 0.5 kg |
| 1000 g | 1 kg |
Exact factor: 1 gram = 0.001 kilograms. Values rounded for display.