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Weight & Mass
Grams to Kilograms
Convert grams (g) to kilograms (kg). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 g = 0.001 kg
Grams to Kilograms Conversion Table
Common values, ready to copy:
| grams | kilograms |
|---|---|
| 1 g | 0.001 kg |
| 2 g | 0.002 kg |
| 5 g | 0.005 kg |
| 10 g | 0.01 kg |
| 25 g | 0.025 kg |
| 50 g | 0.05 kg |
| 100 g | 0.1 kg |
| 1,000 g | 1 kg |
Formula
kilograms = grams × 0.001
Mass conversions use the SI definition: 1 pound is exactly 0.45359237 kilograms. The factor above is the exact ratio between gram and kilogram.
About Grams and Kilograms
Grams (g): Originally defined in 1795 as the mass of one cubic centimeter of water at 4°C; now defined as one thousandth of a kilogram, with the kilogram defined since 2019 by the Planck constant. Common uses: Cooking (especially baking), nutrition labels, postal weight for small parcels, jewelry, and almost any precise mass measurement outside the United States.
Kilograms (kg): The SI base unit of mass; defined since 2019 by the Planck constant, replacing a physical platinum-iridium artifact (Le Grand K) that had served as the definition for 130 years. Common uses: Body weight (everywhere except the US), shipping and freight, food packaging, athletics (Olympic lifts, international powerlifting), and any large-scale industrial measurement.
How the conversion works
Mass conversions use the SI definition: 1 pound is exactly 0.45359237 kilograms. The factor above is the exact ratio between gram and kilogram.
The exact relationship is kilograms = grams × 0.001, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between grams and kilograms comes up wherever weight & mass measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.