Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Grams to Kilograms
Convert g to kg instantly, then review the formula, assumptions, and rounding guidance.
Weight & massInstant result
Decimals
Formula result = input × 0.001 ÷ 1. 1 g = 0.001 kg
Common examples
One value, several units
Kilograms0.001 kg
Milligrams1,000 mg
Metric tonnes0 t
Pounds0.0022 lb
Ounces0.0353 oz
Stone0.0002 st
Conversion table
| g | kg |
|---|---|
| 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 |
Conversion chart
1 g0.001 kg
5 g0.005 kg
10 g0.01 kg
25 g0.025 kg
50 g0.05 kg
Worked example
1 kilogram equals 2.20462 pounds.
Unit definition
Grams (g) One grams equals 0.001 kilogram.
Unit history
Grams is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert g to kilogram.
3. Convert the base value to kg and apply your display precision.
Understand the result before using it
Grams to Kilograms converts a value measured in Grams (g) into the equivalent value in Kilograms (kg). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 0.001 ÷ 1
Assumptions
- Grams and Kilograms represent the same weight & mass quantity.
- The input is expressed in g; the output is expressed in kg.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 g = 0.001 kg. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a g measurement in a document that expects kg.
- Compare a grams value with a value reported in kilograms.
- Check the g-to-kg arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Everyday language often says weight, but these units represent mass. Force requires a local gravitational acceleration.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert Grams to Kilograms?
result = input × 0.001 ÷ 1 Using the displayed relationship, 1 g equals 0.001 kg.
How many Kilograms are in one Grams?
One Grams is 0.001 Kilograms. The displayed digits may be rounded.
Can I reverse the g to kg conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts kg back to g.
Is the Grams to Kilograms result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.