Weight calculator
Your weight on the Moon, Mars and the other planets, or weight from mass and gravity.
About this calculator
This weight calculator shows what you would weigh on the Moon, Mars, Jupiter and the rest of the solar system, using NASA's surface gravity figures.
It can also turn a mass and a gravity into weight as a force, in newtons, kilograms-force and pounds-force.
How it works
Weight is mass × gravity. A scale on another world would show your Earth weight × that world’s surface gravity ÷ Earth’s 9.8 m/s². In newtons, weight = mass in kilograms × gravity in m/s².
Last reviewed:
Worked example
- Work out: Weight on other planets
- Units: lb
- Your weight on Earth: 160
Your weight on the Moon: 26.1 lb (what a bathroom scale would show)
Common questions
How much would I weigh on the Moon?
About one sixth of your Earth weight. Someone who weighs 70 kg on Earth would see about 11.4 kg on a scale on the Moon.
What is the difference between mass and weight?
Mass is the amount of matter in you, in kilograms, and stays the same everywhere. Weight is the force of gravity on that mass, in newtons.
Where would I weigh the most?
Of the planets, on Jupiter, at about 2.4 times your Earth weight, though it has no solid surface to stand on.
Sources and further reading
The story behind it
Where the idea came from: Isaac Newton's law of universal gravitation, published in 1687, explained why the same mass weighs less on the Moon than on Earth.
Apollo astronauts weighed about one sixth as much on the Moon, which is why they bounded along in their heavy suits. Their mass never changed; only the pull of gravity did.
Why you can trust this calculator
- It runs in your browser. Nothing you type into it is sent anywhere.
- The method is explained on this page, so you can check it yourself.
- Free to use, with no sign-up.
- Results are estimates, so please double-check anything important.
- Spotted a mistake? Tell us and we'll look into it.
After 15 years as a mathematics educator, I built CalculStore to give students, teachers, professionals and anyone working with numbers simple, reliable tools.
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