Weight on Other Planets Calculator

Background.

Enter one weight and this calculator returns what the same object would weigh on ten solar-system bodies. There is no unit selector and no need for one: weight is mass multiplied by the local gravitational acceleration, so converting between bodies means multiplying by a ratio of two accelerations, and that ratio is dimensionless. Type 70 kilograms and read kilograms; type 154 pounds and read pounds; type 686 newtons and read newtons. Whatever unit goes in comes back out.

The thing that does not change is your mass. Mass is an amount of matter and it is identical on Mars, on Jupiter and in deep space. Weight is a force — the pull the local gravitational field exerts on that matter — and it is entirely dependent on where you are standing. The distinction is not pedantry; it is written into the metric system. The 3rd General Conference on Weights and Measures resolved in 1901 that the kilogram is a unit of mass, that weight is 'a quantity of the same nature as a force', and that the conventional value of gravitational acceleration for defining a standard weight is 980.665 cm/s². Everything on this page is that one sentence applied ten times.

The gravity values come from NASA JPL's Solar System Dynamics group, which publishes an 'Equatorial Gravity' column for each planet and for Pluto. Those values run: 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. The Moon is not in that table, so its value here is derived from JPL's satellite parameters — GM = 4 902.800118 km³/s² from ephemeris DE440, mean radius 1 737.4 km — giving 1.6242 m/s², which is the familiar one sixth of Earth's.

Two of those numbers are worth a second look. Mercury and Mars come out at 3.70 and 3.71 m/s², effectively identical, even though Mars has nearly twice Mercury's diameter — Mercury makes up in density what it lacks in size. And Saturn, with 95 times Earth's mass, produces only 10.44 m/s², barely above Earth's own, because it is so enormous and so lightly built that its 1-bar surface sits a long way from its centre.

Three scope limits belong here rather than buried in an FAQ. First, precision: JPL publishes that column to three or four significant figures, so quote your answer to three. The extra digits on screen are display precision, not accuracy. Second, rotation: these are non-rotating field strengths, and every spinning body reduces the weight a scale reads at its equator — by 0.35 % on Earth and by a substantial 8.9 % on Jupiter. Third, surfaces: Jupiter, Saturn, Uranus and Neptune do not have one. The radius those gravities refer to is the level at which the atmospheric pressure reaches one bar, a chosen reference rather than ground, so 'your weight on Jupiter' means 'your weight at Jupiter's 1-bar level' and nothing more. The Sun is left out entirely for the same reason, only more so.

If you want the physics rather than the table — the surface gravity of an arbitrary body from its mass and radius, the rotation correction worked out explicitly, or the mass a target gravity implies — the Surface Gravity of a Planet calculator does that instead.

What is weight on other planets calculator?

Your weight on another planet is the gravitational force that planet exerts on your body, and it scales directly with the planet's surface gravity. If g_target is the surface gravity where you are going and g_reference is the surface gravity where you were weighed, your new weight is simply the old weight multiplied by g_target divided by g_reference.

Surface gravity itself comes from Newton's law as g = GM/R², so it depends on both a body's mass and its size. This is why intuition about 'bigger planet, heavier you' fails so often. Mars has ten times Mercury's mass but almost twice its radius, and the two effects nearly cancel to leave near-identical surface gravity. Saturn has 95 Earth masses but a radius nine times Earth's, so its 1-bar gravity is only 6 % above Earth's.

The quantity that does not vary is mass. A 70-kilogram person is 70 kilograms of matter everywhere — on Pluto, on Jupiter, and floating weightless in orbit. In everyday speech 'weight in kilograms' really means mass, which is why bathroom scales, calibrated for Earth, would need recalibrating on any other world to keep telling you the same number.

How to use this calculator.

1. 01Enter your weight in whatever unit you normally use. The unit does not matter and is never asked for, because it cancels.
2. 02Leave the reference body as Earth unless the weight you entered was measured somewhere else.
3. 03Read the table. Mars, the Moon and Jupiter are highlighted as the three most-asked-for bodies; the rest follow.
4. 04Round your answer to three significant figures — that is all the published gravity values support.
5. 05To work backwards, change the reference body: enter a Mars weight, choose Mars, and the Earth figure tells you what it would weigh at home.
6. 06Read the note beneath the results for the mass-versus-weight distinction and the rotation and 1-bar caveats.

The formula.

Weight is W = m·g, so the weight of the same object on two bodies is in the ratio of their surface gravities: W₂/W₁ = g₂/g₁. The mass m cancels, and so does the unit, because both sides carry whatever unit of force or force-equivalent you started with. That is the entire calculation, applied ten times.

PROVENANCE OF THE GRAVITY VALUES. The eight planets and Pluto use NASA JPL's published 'Equatorial Gravity' column verbatim; JPL notes that column is derived from the mass and radius values in the same table. Recomputing GM/R_eq² from those masses and equatorial radii reproduces the published column to better than 0.09 % for every planet, and to 0.71 % for Pluto — the larger gap there being simply that Pluto's 0.62 is quoted to two significant figures. The Moon's 1.6242 m/s² is derived here, because JPL's planetary table has no Moon row, from the satellite table's GM of 4 902.800118 km³/s² (ephemeris DE440) and its mean radius of 1 737.4 km.

SIGNIFICANT FIGURES. Read the answer to three significant figures. The source values carry three or four, so a fourth digit is at the edge of meaningful and a fifth is display only.

ROUNDING STAGE. Nothing is rounded part-way through. All arithmetic runs at 40 significant digits in a dedicated high-precision decimal context, and rounding happens once, at the return boundary, to 10 decimal places. There are no thresholds anywhere in this calculator: the mapping from one weight to another is exactly linear, with no branch that could behave differently on either side of a boundary.

APPROXIMATION REGIME. These are non-rotating equatorial field strengths for a spherical body. They omit the centrifugal reduction each body's own spin causes at its equator — 0.35 % on Earth, 8.9 % on Jupiter — as well as latitude variation and local geology. For the four giant planets the reference radius is the 1-bar pressure level, so the figure is 'gravity at the 1-bar level', not 'gravity at a surface'. The Sun is excluded because it has no usable surface at all.

INVALID DOMAIN. The weight must be strictly positive: a weight is a positive force magnitude, and zero or negative values are rejected with a labelled error. A reference body outside the list of ten is also rejected rather than silently falling back to Earth, which would return a plausible-looking but wrong table.

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.