Planetary Surface Gravity Calculator
Calculate surface gravity on any planet, moon, or body.
Find the weight of a 70 kg person in Newtons and Earth-equivalent kilograms.
Surface Gravity
Surface gravity is the gravitational acceleration at the surface of a planetary body.
Formula:
g = GM / R²
Where:
- G = 6.674 × 10⁻¹¹ N·m²/kg²
- M = mass of the body (kg)
- R = radius of the body (m)
Surface gravity around the Solar System:
| Body | g (m/s²) | Relative to Earth |
|---|---|---|
| Mercury | 3.70 | 0.378× |
| Venus | 8.87 | 0.905× |
| Earth | 9.81 | 1.000× |
| Moon | 1.62 | 0.165× |
| Mars | 3.72 | 0.379× |
| Jupiter | 24.79 | 2.528× |
| Saturn | 10.44 | 1.065× |
| Uranus | 8.69 | 0.886× |
| Neptune | 11.15 | 1.137× |
| Pluto | 0.62 | 0.063× |
| Sun | 274.0 | 27.9× |
Weight calculation:
Weight = mass × g
On Mars, a 70 kg person would weigh only 26 kg-equivalent — they could jump nearly 3× higher. On Jupiter’s cloud tops, they would weigh 177 kg-equivalent and could barely stand.
Note on “weight on other planets”: The mass of a person (in kg) never changes — only their weight (in Newtons) changes. We convert back to “kg-equivalent” by dividing the force by Earth’s gravity (9.81 m/s²) for easy intuitive comparison.