Planet Weight Calculator
See what you would weigh on every planet, the Moon, Pluto, and the Sun.
Mars pulls at about 0.377× Earth’s gravity, so your weight there is roughly 38% of your Earth weight. Your mass never changes — only your weight scales with each body’s surface gravity.
| Body | Gravity (× Earth) | Your weight (kg) |
|---|---|---|
| Mercury | 0.378 | 26.46 |
| Venus | 0.907 | 63.49 |
| Earth | 1.000 | 70 |
| Moon | 0.166 | 11.62 |
| Mars | 0.377 | 26.39 |
| Jupiter | 2.364 | 165.5 |
| Saturn | 0.916 | 64.12 |
| Uranus | 0.889 | 62.23 |
| Neptune | 1.120 | 78.4 |
| Pluto | 0.063 | 4.41 |
| Sun | 27.900 | 1953 |
Your weight on another body equals your Earth weight times that body’s surface-gravity ratio. A 70 kg person weighs about 26 kg-force on Mars (70 × 0.377 ≈ 26.4), about 12 kg on the Moon, and roughly 165 kg on Jupiter. Your mass stays 70 kg everywhere — only weight changes with gravity.
Weight versus mass
Mass is constant; weight is not. Mass is the amount of matter in your body and never changes, whether you are on Earth, the Moon, or drifting in deep space. Weight is the force gravity exerts on that mass, so it scales directly with the local surface gravity. Stand on a world where gravity is half of Earth’s and you weigh half as much — but you are made of exactly the same stuff.
This tool uses surface-gravity ratios relative to Earth (Earth = 1.000). Multiply your Earth weight by a body’s ratio and you get your weight there in the same unit. Because it is a straight ratio, the unit passes through unchanged: enter kilograms and you read kilograms-force, enter pounds and you read pounds.
The g ratio is a body’s surface gravity as a multiple of Earth’s (Earth = 1.000); your unit is unchanged.
Worked example
What would a 70 kg person weigh on Mars? Mars has a surface-gravity ratio of 0.377× Earth’s.
- 1 Note your Earth weight. Use your everyday scale reading, e.g. 70 kg.
- 2 Find the body’s gravity ratio. Mars has a surface gravity of 0.377× Earth’s.
- 3 Multiply. weight on Mars = 70 × 0.377 ≈ 26.4 kg-force.
- 4 Repeat for other bodies. For the Moon (0.166): 70 × 0.166 ≈ 11.6; for Jupiter (2.364): 70 × 2.364 ≈ 165.5.
Surface-gravity ratios across the solar system
Conventional textbook surface gravity as a multiple of Earth’s (Earth = 1.000). Weight on a body = Earth weight × ratio.
| Body | Gravity (× Earth) | Weight of a 70 kg person |
|---|---|---|
| Mercury | 0.378 | 26.5 kg |
| Venus | 0.907 | 63.5 kg |
| Earth | 1.000 | 70.0 kg |
| Moon | 0.166 | 11.6 kg |
| Mars | 0.377 | 26.4 kg |
| Jupiter | 2.364 | 165.5 kg |
| Saturn | 0.916 | 64.1 kg |
| Uranus | 0.889 | 62.2 kg |
| Neptune | 1.120 | 78.4 kg |
| Pluto | 0.063 | 4.4 kg |
| Sun | 27.90 | 1953 kg |
How to read the numbers
Gas giants are not as crushing as you might guess. Jupiter is over 300 times Earth’s mass, yet its surface gravity is only about 2.4× Earth’s, because its enormous radius pushes the visible “surface” far from its centre of mass. Saturn, Uranus, and even Neptune sit surprisingly close to Earth’s gravity for the same reason.
The Sun is the extreme case. At 27.9× Earth’s gravity, a 70 kg person would weigh nearly two tonnes-force there — a reminder that surface gravity depends on how much mass is packed within a given radius, and the Sun packs an immense amount.