Weight on Other Planets Calculator

Background.

How much would you weigh on Mars? A little under two fifths of what you weigh at home: a person who reads 70 on an Earth bathroom scale would read 26.5 there. The Moon takes you to about a sixth, Jupiter to about two and a half times. Each answer is your Earth weight multiplied by the ratio of two surface gravities, which is why it does not matter whether you type kilograms, pounds, stones or newtons. The ratio has no unit, so the unit you put in is the unit you get back.

Nothing about you changes on the journey except the force pressing you into the floor. Your mass, the amount of matter in you, is the same on every world. The metric system has drawn this line since 1901, when the General Conference on Weights and Measures declared the kilogram a unit of mass and weight a force: mass times the local acceleration of gravity. A bathroom scale is really a force meter calibrated for Earth, which is why it would mislead you anywhere else.

The gravity figures for the eight planets and Pluto are NASA JPL's published equatorial values. The Moon's, 1.6242 m/s², is worked out from JPL's lunar mass parameter and radius. Some of them defy intuition: Mercury and Mars pull almost identically, and Saturn, with 95 times Earth's mass, pulls only about 6.5 % harder than Earth. For the four giant planets there is no ground to stand on, so their figures refer to the height at which the atmospheric pressure is one bar. None of the values subtracts the lightening effect of each body's spin.

What is weight on other planets calculator?

Weight is the force a body's gravity exerts on an object, W = m × g, where m is mass and g is the local gravitational acceleration. Moving the same object from one world to another changes g and leaves m alone, so weights on two bodies stand in the same ratio as their surface gravities. Surface gravity itself comes from Newton's law, g = GM ⁄ R², so it depends on a body's mass and on the square of its radius. A large planet of low density can have weaker surface gravity than a small, dense one would suggest.

How to use this calculator.

1. 01Type the weight you know in whatever unit you normally use; the answers come back in that same unit. A bathroom-scale reading in kilograms or pounds is fine.
2. 02Leave the reference body as Earth if that is where the weight was measured.
3. 03To work backwards, choose the body the weight was measured on. An Earth bathroom scale that reads 26.5 on Mars means 70 back home.
4. 04Read Mars, the Moon and Jupiter at the top and the other seven bodies below, and round to three significant figures, which is as far as the published gravity values go.

The formula.

Because W = m × g on every body and m does not change, the weight on a target body is W_target = W_reference × g_target ⁄ g_reference. Mass cancels, and so does whatever unit the weight was given in. There is nothing else in the calculation: the result scales in strict proportion to the weight you enter.

The g values are NASA JPL's equatorial gravity column: Mercury 3.70, Venus 8.87, Earth 9.80, Mars 3.71, Jupiter 24.79, Saturn 10.44, Uranus 8.87, Neptune 11.15 and Pluto 0.62 m/s². JPL derives these from its own masses and equatorial radii. The Moon has no row in that table, so its value is calculated as GM ⁄ R² from JPL's lunar GM of 4,902.800118 km³/s² and mean radius of 1,737.4 km, giving 1.6242 m/s².

These are the pure gravitational pull at the equator. A spinning body flings its surface outward slightly, so a scale at the equator reads less than the table implies: about 0.35 % less on Earth and 8.9 % less on Jupiter, which turns once every 9.9 hours. Weight also varies with latitude and altitude on any body. Earth's own surface gravity runs from about 9.78 m/s² at the equator to 9.83 m/s² at the poles. Those effects sit beyond the three significant figures the published values carry.

For Jupiter, Saturn, Uranus and Neptune the radius behind the gravity is the 1-bar pressure level, a reference height rather than a surface. The Sun is not offered at all.

A worked example.

Frequently asked questions.

References& sources.

1. [1]NASA JPL Solar System Dynamics, 'Planetary Physical Parameters'. Column 'Equatorial Gravity (m s⁻²)': Mercury 3.70, Venus 8.87, Earth 9.80, Mars 3.71, Jupiter 24.79, Saturn 10.44, Uranus 8.87, Neptune 11.15; dwarf-planet table, Pluto 0.62. JPL notes the column is 'derived from other referenced values and uncertainties in this table'. Also the source of the masses and equatorial radii used to verify it. Independent, open access. Retrieved 2026-07-29.
2. [2]NASA JPL Solar System Dynamics, 'Planetary Satellite Physical Parameters'. Earth's Moon: GM = 4902.800 ± 0.001 km³/s², mean radius 1737.4 ± 0.1 km, mean density 3.344 g/cm³, from ephemeris DE440. Used to derive the Moon's surface gravity of 1.6242 m/s², since the planetary table has no Moon row. Independent, open access. Retrieved 2026-07-29.
3. [3]BIPM, 3rd CGPM (1901) Resolution 2, 'Declaration on the unit of mass and on the definition of weight; conventional value of gₙ': the kilogram is a unit of mass; weight is 'a quantity of the same nature as a force' equal to mass times the acceleration of gravity; the conventional standard value is 980.665 cm/s². This is the primary authority for the mass-versus-weight distinction stated throughout this page. Independent, open access. Retrieved 2026-07-29.
4. [4]NASA Science, 'Moon Facts' (page updated 12 February 2026): 'the gravity on the surface of the Moon is one-sixth of Earth's', and 'The Moon is an average of 238,855 miles (384,400 kilometers) away.' Used as an independent editorial check on the derived lunar gravity. Independent, open access. Retrieved 2026-07-29.
5. [5]NIST, CODATA 2022 recommended value of the Newtonian constant of gravitation: G = 6.674 30(15) × 10⁻¹¹ m³ kg⁻¹ s⁻². Used only in the verification step that recomputes JPL's gravity column from its own masses and radii. Independent, open access. Retrieved 2026-07-29.