Weight on Other Planets Calculator

Enter your weight in pounds or kilograms and see what a scale would read on ten other worlds, from the Moon's gentle one sixth to the Sun's 28-fold pull. Your mass never changes on the trip; the push of the ground under the scale does.

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Your weight

Enter what your scale reads at home. The result updates as you type.

CycleCalcs.comEnter your weight to see what the scale would read on ten other worlds.

What this calculator answers: what a scale would read under each world's gravity, starting from the weight you enter. It is arithmetic about you, not a guide to the planets. For the worlds themselves, their fact tables, visibility and cycles, see the Sun, Moon & Planets pages.

How the numbers are worked out

For the models, accuracy and data behind these figures, see the methodology and sources page.

A bathroom scale does not measure how much of you there is. It measures how hard the floor pushes up to hold you still, and that push equals your mass times the local pull of gravity, W = m × g. Move the same scale and the same you to a world with a different g, and the reading changes in exact proportion:

weight there = weight here × ( local g / 9.80 )

Earth's surface gravity is 9.80 m/s², so each world's gravity divided by 9.80 gives the ratio in the table. The Moon's 1.62 m/s² works out to about 1/6, which is why everything on the Moon weighs about a sixth of what it does here. The gravity values are the same NSSDCA-derived figures quoted in the fact tables on our planet pages.

Mass is not weight

Mass is the amount of matter in you, and it is identical on every world and in empty space. Weight is the force gravity exerts on that mass. Strictly, weight is measured in newtons; scales report it in pounds or kilograms because that is what people expect. Pounds are a weight unit, so converting them from world to world is straightforward. Kilograms are a mass unit, and your mass does not convert to anything; when the calculator shows kilograms for another world, it is showing what an Earth-calibrated scale would read there, which is the number most people are actually asking for.

Worked example: 150 lb on Mars

Mars pulls at 3.73 m/s², and 3.73 / 9.80 = 0.38. So 150 × 0.38 is about 57 lb; carried at full precision the calculator shows 57.1 lb. Mercury lands within half a pound of that, at 56.6 lb, since its 3.70 m/s² also rounds to 0.38 of Earth's.

Worked example: 70 kg on the Moon

The Moon's 1.62 m/s² is about a sixth of Earth's 9.80, and 70 × 1.62 / 9.80 gives 11.6. An Earth-calibrated scale on the Moon would read about 11.6 kg. Your mass is still 70 kg; the scale feels less push, and reports it faithfully.

Worked example: the Sun, on paper

The photosphere's 274 m/s² is about 28 times Earth's 9.80, so 150 lb becomes 4,193.9 lb, a little over two tons. There is nothing to stand on, so no scale will ever confirm it, but the arithmetic is sound.

What the scale reads: 150 lb and 68 kg on every world

Ratios are each world's gravity divided by Earth's 9.80 m/s². The kilogram column is what an Earth-calibrated scale would read.

Body	Gravity (m/s²)	× Earth	150 lb becomes	68 kg reads
Earth (reference)	9.80	1.00	150.0	68.0
Moon	1.62	0.17	24.8	11.2
Mercury	3.70	0.38	56.6	25.7
Venus	8.87	0.90	135.8	61.5
Mars	3.73	0.38	57.1	25.9
Jupiter	25.9 (mean, at the cloud tops)	2.64	396.4	179.7
Saturn	11.19 (mean, at the cloud tops)	1.14	171.3	77.6
Uranus	9.01 (mean, at the cloud tops)	0.92	137.9	62.5
Neptune	11.27 (mean, at the cloud tops)	1.15	172.5	78.2
Pluto	0.62	0.06	9.5	4.3
Sun	274 (photosphere)	27.96	4,193.9	1,901.2

Jupiter, Saturn, Uranus and Neptune have no surface, so their fact tables quote gravity (mean, at the cloud tops); the Sun's figure is the pull at its visible surface, the photosphere. For your own numbers, use the calculator above.

Where you could actually stand

Five of the ten worlds in the table offer a floor. The Moon, Mercury, Venus, Mars, and Pluto are solid, and a scale set down on any of them would read what the table says, setting aside some practical objections. Venus in particular has strong ones.

The four giant planets do not offer a floor. Descend from Jupiter's cloud tops and the gas simply thickens, growing hotter and denser until it becomes fluid, with no boundary you could rest a scale on. That is why the fact tables for Jupiter, Saturn, Uranus and Neptune quote gravity as a mean at the cloud tops rather than a surface value: it is the pull where the visible planet begins. You could float past a giant planet at that level. You could not stand on it.

The Sun gets the same honest treatment. Its 274 m/s², about 28 times Earth's, is the gravity at the photosphere, the layer we see as its surface. Nothing stands there either, so the Sun's row is a statement about gravity, not an invitation.

The Uranus surprise

Uranus carries 14.5 times Earth's mass, yet its row shows a ratio of 0.92. You would weigh slightly less on Uranus than you do on Earth. The reason is distance: its cloud tops sit about four times farther from its center than Earth's surface does from Earth's, and gravity weakens with the square of that distance. Fourteen and a half divided by four squared is a shade under one, and the measured figure agrees.

A smaller coincidence hides in the inner solar system. Mercury and Mars both land on 0.38, though Mars is the larger world by far. Mercury makes up the difference with density; its outsized iron core packs more pull into a smaller radius.

Frequently asked questions

Why would I weigh less on Mars?

Mars's surface gravity is 0.38 of Earth's: 3.73 meters per second squared against our 9.80. Weight is mass times local gravity, so a scale on Mars reads 38 percent of what it reads at home, and 150 lb becomes about 57 lb. Your body has not changed; the pull of the ground has.

Does my mass change on other planets?

No. Mass is the amount of matter in you, and it is the same on the Moon, on Mars, or drifting in deep space. Weight is the force gravity exerts on that mass. The force changes from world to world; the matter does not.

Can I really stand on Jupiter?

No. Jupiter has no surface, only an atmosphere that thickens with depth until it becomes fluid. The 25.9 figure is the mean gravity at the cloud tops, quoted because there is nothing solid underneath to measure from. The same goes for Saturn, Uranus, and Neptune, which is why the calculator labels all four as cloud-top values. You could float past a giant planet; you could not stand on one.

Why do I weigh almost the same on Uranus as on Earth?

Uranus carries 14.5 times Earth's mass, but its cloud tops sit about four times farther from its center than Earth's surface does from Earth's. Gravity weakens with the square of that distance, and the two effects nearly cancel, 9.01 against Earth's 9.80. The odd result is that you would weigh slightly less on Uranus than you do at home.

Where would I weigh the most?

On the Sun, at least on paper. The pull at its visible surface, the photosphere, is 274 meters per second squared, about 28 times Earth's, so a 150 lb person would register over 4,000 lb. There is no ground to stand on and the visit would end badly for other reasons, but as a statement of gravity the number is honest. Among the worlds in the table with solid ground, none beats Earth itself; Venus comes closest, at about nine tenths of your home weight.

Why does the Moon's one-sixth gravity matter for astronauts?

The Moon pulls at 1.62 meters per second squared, about one sixth of Earth's 9.80. That sixth is why the Apollo suit and life-support pack, around 180 lb on Earth, weighed only about 30 lb on the lunar surface, and why astronauts settled into the famous bouncing lope: legs tuned to Earth's pull push far too hard for the Moon's. Falls came slowly too, which the crews learned to use, tipping fully over and pushing back up.

Keep exploring

Planets