Weight vs mass
Your mass (the amount of matter in your body) doesn't change from planet to planet — but your weight (the force of gravity on you) does, because each planet has a different surface gravity.
Gravity relative to Earth
| Body | Relative gravity |
|---|---|
| Mercury | 0.378 |
| Venus | 0.907 |
| Earth | 1.000 |
| Moon | 0.166 |
| Mars | 0.377 |
| Jupiter | 2.360 |
| Saturn | 0.916 |
| Uranus | 0.889 |
| Neptune | 1.120 |
Formula: weight on planet = weight on Earth × planet's relative gravity.
Frequently asked questions
Why would I weigh more on Jupiter?
Because Jupiter's surface gravity is 2.36 times Earth's, despite being a gas giant — its huge mass more than compensates for its much larger radius.
Why does Saturn have lower gravity than Earth despite being so big?
Because Saturn is much less dense (it's the least dense planet in the Solar System) — surface gravity depends on both mass and radius, not size alone.
Does this account for my height or body composition?
No — it's a simple weight conversion by relative gravity, with no other physical variables involved.