Kilograms measure mass; newtons measure force. On Earth a 1 kg mass weighs 9.81 N. The kilogram-force (kgf) is an older unit equal to the weight of 1 kg in standard gravity, still found on scales and spring gauges.
How to use the kg to Newtons Calculator
- Location
- Custom gravity
- Mass
- Every result field is editable: type into Weight and Mass plus every other field update to match.
Results update as you type, every field has its own unit menu, and everything is calculated in your browser.
How it works
Choose where the mass is, enter it, or type a weight in newtons to find the mass.
Inputs explained
| Field | What to enter |
|---|---|
| Location | Choose one: Mercury, Venus, Earth, Moon … |
| Custom gravity | Units: m/s², ft/s², g, cm/s² |
| Mass | Units: kg, g, mg, t, lb, oz |
What each result means
- Weight = [Mass]×[g]
- Weight in kilogram-force = [Mass]×[g]
Example values
How the main result changes when Mass changes and everything else stays at the example values above:
| Mass (kg) | Weight (N) |
|---|---|
| 5 | 49.0332 |
| 7.5 | 73.5499 |
| 10 | 98.0665 |
| 12.5 | 122.5831 |
| 15 | 147.0998 |
| 20 | 196.133 |
Formula
W (N) = m (kg) × g; 1 kgf = 9.80665 N
Worked example
Inputs — Location: Earth; Mass: 10 kg.
Results — Weight = 98.0665 N; Weight in kilogram-force = 10 kgf.
Key terms
- Kilogram-force
- The weight of 1 kg in standard gravity, 9.80665 N.
Frequently asked questions
How many newtons is 1 kg?
9.80665 N in standard Earth gravity.
How many kg is 100 N?
About 10.2 kg on Earth.
Is a kilogram a unit of weight?
Strictly no – it is mass. Bathroom scales convert your weight to mass assuming Earth gravity.
What would 1 kg weigh on the Moon?
About 1.62 N.