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Weight on Other Planets Calculator

See your weight on Mars, the Moon and other worlds.

How it is calculated

The tool multiplies your weight by a fixed surface-gravity ratio for the chosen body: W_body = W_earth × k. Here W_earth is the number you enter and k is the body's surface gravity divided by Earth's. The ratios used are Mercury 0.378, Venus 0.907, Moon 0.166, Mars 0.377, Jupiter 2.36, Saturn 0.916, Uranus 0.889, Neptune 1.12, Pluto 0.071 and Sun 28.0, taken from the NASA planetary fact sheet (the Sun from its surface gravity of 274.0 m/s² against the fact sheet's 9.78 m/s² for Earth).

The result is in the same unit you typed (kg, lb or anything else), because only a ratio is applied. Negative weights are rejected. If the planet is not recognised the tool falls back to Mars. Gas giants and the Sun have no solid surface, so the figure refers to gravity at the visible cloud tops or surface level.

Worked example

A person weighing 70 on Earth selects Mars. The Mars ratio is 0.377, so 70 × 0.377 = 26.39. The tool shows 26.39 with a gravity factor of 0.377 g. Selecting Jupiter instead would multiply by 2.36, giving 165.2, while the Moon would give 70 × 0.166 = 11.62.

Try this example →

Common mistakes

  • Thinking your mass changes. Only the gravitational force changes; the amount of matter in your body stays the same on every world.
  • Mixing units. Whatever unit you enter (kg or lb) comes back out, so do not read a pounds input as kilograms.
  • Treating the gas giants as places you could stand. Jupiter, Saturn, Uranus and Neptune have no solid ground, so the value is only a gravity comparison.
  • Reading the gravity factor as m/s². It is a ratio to Earth's gravity, shown with a g suffix, not an acceleration.
  • Leaving the planet selection unchanged and assuming it is Earth. The default is Mars.

Sources

About this calculator

This calculator shows how much you would weigh on other planets and the Moon by scaling your Earth weight by the ratio of each body's surface gravity to Earth's (9.81 m/s²). Surface gravity depends on a body's mass and radius, which is why the Moon (about 1/6 of Earth's gravity) makes you feel far lighter, while Jupiter (about 2.4 times Earth's gravity) would make you feel much heavier — even though your actual mass never changes.

It's a popular tool for science education, helping students grasp the difference between mass (constant everywhere) and weight (a force that depends on local gravity), and it's widely used to illustrate Newton's law of universal gravitation.

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Comments (1)

  • Editorial team

    One surprise in the table: Saturn gives 1.07 and Neptune 1.12, barely above Earth, even though both are far more massive. Their huge radius spreads that mass out, so the pull at the cloud tops stays modest. Remember that the result compares forces, like a bathroom scale reading, while your mass stays the same. Choosing the Moon and entering 20 for a 20 kg dumbbell returns 3.32. Which moon or dwarf planet would you like to see added?

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