Kilograms to Grams
Type a value in either box to convert between kilograms and grams. The factor is 1000.
| Kilograms | Grams |
|---|---|
| 1 kg | 1000 g |
| 2 kg | 2000 g |
| 3 kg | 3000 g |
| 5 kg | 5000 g |
| 10 kg | 10000 g |
| 25 kg | 25000 g |
| 50 kg | 50000 g |
| 100 kg | 100000 g |
How to use
- Enter a value in the Kilograms field.
- The Grams figure appears immediately — no button to press.
- Typing in the Grams field converts back to Kilograms the same way.
- Use the reference table for the values that come up most often.
Kilograms to Grams formula
The factor from kilograms to grams is 1000.
g = kg × 1000
Put another way, one kilogram is exactly 1,000 grams.
Why this factor: the kilogram and the gram are both defined against the kilogram, so dividing one definition by the other gives 1000 directly. Both definitions are set out in full below.
To go the other way, divide by 1000 — or use the Grams to Kilograms converter, which is the same calculation reversed.
Worked example
Start with 150 kg. Multiply by 1000 to get 150000 g.
150 kg × 1000 = 150000 g
The converter above does this for any value you type, in either direction.
What is a kilogram?
The kilogram is the SI base unit of mass — the reference for every other mass unit.
Definition: Since 2019 the kilogram has been defined by fixing the Planck constant at exactly 6.62607015×10⁻³⁴ joule-seconds, retiring the physical platinum-iridium cylinder that defined it for 130 years.
Where it is used: Universal in science, trade and everyday weighing outside the United States.
What is a gram?
A gram is one thousandth of a kilogram, the everyday unit for food and small-object mass.
Definition: Exactly 0.001 kilogram by SI prefix definition.
Where it is used: Nutrition labels, recipes, postal rates, and laboratory weighing.
Kilograms vs Grams
The kilogram is an SI unit while the gram is a metric unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many grams are in a kilogram?
One kilogram equals 1000 grams.
What is the formula to convert kilograms to grams?
Multiply the number of kilograms by 1000. To reverse it, divide by 1000 instead.
How do I convert grams back to kilograms?
Divide by 1000, which is the same as multiplying by 0.001.
How many grams are in 10 kilograms?
10 kg works out to 10000 g.
How is the kilogram defined?
Since 2019 the kilogram has been defined by fixing the Planck constant at exactly 6.62607015×10⁻³⁴ joule-seconds, retiring the physical platinum-iridium cylinder that defined it for 130 years.