Newtons to Kilograms: How to Convert N to kg
November 9, 2026
Newtons and kilograms measure different things. A newton (N) is a unit of force. A kilogram (kg) is a unit of mass. You can't convert one into the other the way you convert meters to feet, because the answer depends on how strongly gravity is pulling.
On Earth that pull is steady enough for the conversion to work in practice, and that's what people mean when they ask how many kilograms a newton is.
The short answer
Divide newtons by 9.80665 to get kilograms.
- 1 N is about 0.102 kg, or roughly 102 grams
- 10 N is about 1.02 kg
- 100 N is about 10.2 kg
- 1 kN (1,000 N) is about 102 kg
Going the other way, multiply kilograms by 9.80665 to get newtons. A 70 kg person presses down on the floor with about 686 N.
Strictly, those answers are in kilogram-force (kgf), the force gravity puts on one kilogram. That's the unit behind most "N to kg" questions, and the newton to kilogram-force converter gives it to as many digits as you need.
Why 9.80665?
Weight is mass times gravitational acceleration: W = m × g. Gravity varies a little over the Earth's surface, from about 9.78 m/s² at the equator to about 9.83 m/s² at the poles. In 1901 the General Conference on Weights and Measures fixed a standard value of 9.80665 m/s², so that everyone converting between force and mass gets the same answer.
That makes one kilogram-force exactly 9.80665 newtons, by definition.
Newtons to kilograms table
| Newtons | Kilograms (kgf) |
|---|---|
| 1 N | 0.102 |
| 10 N | 1.020 |
| 50 N | 5.099 |
| 100 N | 10.197 |
| 250 N | 25.493 |
| 500 N | 50.986 |
| 1,000 N (1 kN) | 101.972 |
| 5,000 N (5 kN) | 509.858 |
| 10,000 N (10 kN) | 1,019.716 |
Where newtons and kilograms meet
- Climbing gear. Carabiners and slings are rated in kilonewtons. A carabiner marked 22 kN holds a force equal to the weight of about 2,243 kg under standard gravity. The peak force in a fall is far higher than a climber's body weight, which is why the ratings look so large.
- Hardware and lifting gear. Wall anchors, hooks and straps often list a working load in newtons or kilonewtons. Divide by 9.80665 for a figure in kilograms you can picture.
- Physics homework. Problems give a weight in newtons and ask for the mass, or the reverse. Many textbooks round g to 9.8 or 9.81 m/s², so use whatever value your course gives.
- Scales. A scale measures force and shows mass by dividing by a fixed value of g. That's why a bathroom scale would read wrong on the Moon.
A quick mental shortcut
Divide newtons by 10. The result is about 2% lower than the exact answer, which is fine for a sense of size: 500 N is "about 50 kg", and the exact figure is 50.99 kg. For anything safety-related, such as a load rating, use the exact factor.
What changes on the Moon
Mass is the same everywhere. Weight isn't. Gravity at the Moon's surface is about 1.62 m/s², so a force of 100 N there corresponds to a mass of about 61.7 kg, not 10.2 kg. A 70 kg astronaut who weighs about 686 N on Earth weighs only about 113 N on the Moon.
That's the real reason newtons and kilograms can't be converted directly. The conversion only holds for one value of gravity, and 9.80665 m/s² is the Earth's.
Related conversions
- Pound-force. 100 N is 22.48 lbf, and 1 lbf is 4.448 N. Use the newton to pound-force converter.
- Kilogram-force to newtons. Multiply by 9.80665, or use the kgf to newton converter.
- Mass units. For kilograms, pounds, ounces and stone, use the weight and mass converter.
- Every force unit at once. Try the force converter.