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 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.
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
SuperGlobalCalculator is independently built and maintained. See how we build and verify our calculators.