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Weight depends on gravity, and every planet (and moon) in the solar system has a different surface gravity relative to Earth's. Your mass stays the same everywhere, but your weight — the force gravity exerts on you — changes with it.
This calculator takes your weight on Earth and a destination, and scales it by that body's surface gravity relative to Earth's to estimate your weight there.
How it works
Enter your weight on Earth and choose a destination from the list. The tool multiplies your Earth weight by that body's surface gravity ratio (relative to Earth = 1.0) to estimate your weight there, in the same units you entered.
- Enter your weight on Earth.
- Enter destination.
- Click Calculate to see your results.
Examples
Weight on Mars
A person weighing 70 (in any consistent unit) on Earth would weigh about 26.4 on Mars, since Mars's surface gravity is about 0.377 times Earth's.
Who should use it
- Astronomy or physics education — illustrating how gravity varies across the solar system.
- Satisfying curiosity about space travel and planetary science.
Industry applications
- Physics and astronomy education
Advantages
- Quick, fun way to see how weight varies across the solar system.
- Uses standard, published surface gravity ratios.
Limitations
- Gas giants (Jupiter, Saturn, Uranus, Neptune) have no solid surface, so "standing" there is a simplification for comparison purposes only.
Common mistakes to avoid
- Confusing weight (a force that depends on gravity) with mass (which stays constant everywhere).
- Assuming larger planets always have stronger surface gravity — Uranus, for example, is much larger than Earth but has slightly weaker surface gravity due to its lower density.
Best practices
- Remember this is a simple ratio based on surface gravity only — it doesn't model standing on a gas giant like Jupiter or Saturn, which have no solid surface to stand on.
Tips
- The Moon's gravity (about 0.166 times Earth's) is why astronauts could jump so much higher and farther during the Apollo missions.