How the Weight Calculator Works (The Science)
Your mass — the amount of matter in your body — never changes, no matter where you travel. What changes is your weight, which is the force of gravity pulling on that mass. Every planet, moon and dwarf planet has a different surface gravity, so the "same you" registers a different weight on every world.
The formula is simple:
Weight on planet = Your Earth weight × (planet's surface gravity ÷ Earth's gravity)
Earth's surface gravity is about 9.81 m/s². Mars, being smaller and less dense, pulls with about 3.71 m/s² — roughly 37.7% of Earth's pull. That's why a person who weighs 70 kg on Earth would weigh only about 26.4 kg on Mars. Meanwhile Jupiter, the giant of the Solar System, pulls with 2.36 times Earth's gravity — you'd feel heavier than ever there.
Quick reference: gravity of each world
| World | Surface gravity (m/s²) | % of Earth gravity |
|---|---|---|
| 🌙 Moon | 1.62 | 16.6% |
| ☿ Mercury | 3.70 | 37.8% |
| ♀ Venus | 8.87 | 90.7% |
| ♂ Mars | 3.71 | 37.7% |
| ♃ Jupiter | 24.79 | 236.4% |
| ♄ Saturn | 10.44 | 91.6% |
| ♅ Uranus | 8.87 | 88.9% |
| ♆ Neptune | 11.15 | 112.5% |
| (dw) Pluto | 0.62 | 6.3% |
Fun examples
- A 70 kg adult would weigh about 11.6 kg on the Moon — light enough to jump like a superhero.
- The same person would weigh 165 kg-equivalent on Jupiter — more than most adults weigh in total.
- On tiny Pluto you'd weigh just 4.4 kg — you could leap several meters high!
Want to know how fast you'd age on other worlds too? Try our Age on Other Planets calculator, take a break with a round of Astro Dodge, or read the full physics breakdown in Weight on Mars, Explained.