Weight on Other Planets Calculator
Enter your weight on Earth and see what you would weigh on every planet in the solar system, plus the Moon, Pluto, and the Sun. The calculator uses each body's surface gravitational acceleration relative to Earth. Switch between kilograms, pounds, stone, and newtons - all outputs update as you type.
Why does your weight change on other planets?
Weight is the force that gravity exerts on your mass. Because every planet has a different size and density, each one pulls with a different gravitational acceleration. On a planet with stronger gravity than Earth you feel heavier; on a lighter-gravity world you feel lighter. Your mass - the amount of matter you are made of - does not change at all. A person who masses 70 kg on Earth masses exactly 70 kg on Mars, Jupiter, and in deep space. Only the force of gravity changes, and that force is what a scale measures as weight.
How the calculation works
The weight on any planet is found by multiplying your Earth weight by the ratio of that planet's surface gravitational acceleration to Earth's. Earth's surface gravity is defined as 9.807 m/s^2. For example, Mars has a surface gravity of about 3.72 m/s^2, giving a ratio of 3.72 / 9.807 = 0.379. A person weighing 70 kg on Earth would weigh 70 x 0.379 = 26.5 kg on Mars. The formula is: weight_planet = weight_Earth x (g_planet / g_Earth). The gravity values in this calculator come from NASA planetary fact sheets and use the mean equatorial surface gravity for each body.
Highlights across the solar system
Jupiter is the most massive planet in the solar system, but its surface gravity (about 23 m/s^2) is only around 2.4 times Earth's - because Jupiter is far larger in radius as well as in mass, and the surface is farther from the center. Saturn, despite being the second largest planet, has nearly the same surface gravity as Earth because it is much less dense. The Moon's gravity (1.62 m/s^2) is only about one-sixth of Earth's, which is why astronauts could leap so high during the Apollo missions. Pluto, now classified as a dwarf planet, has a tiny surface gravity of about 0.62 m/s^2, just 6% of Earth's - even less than the Moon. The Sun has by far the strongest pull: at its photosphere, gravity is roughly 28 times Earth's.
Mass vs weight: a common confusion
In everyday speech, "weight" often means mass - the readout on a bathroom scale in kilograms. In physics, weight is a force (measured in newtons) equal to mass times gravitational acceleration. This calculator works with both: when you enter kilograms it is treating your reading as a conventional "mass-in-kg" and computing how many kg-equivalent that mass would register on each planet's scale. When you select newtons it works directly in force units. Either way, the ratio between any two planets is the same, and the distinction does not affect the comparison.
Surface gravity and weight multipliers for every body
| Body | Surface gravity (m/s^2) | Relative to Earth | Type |
|---|---|---|---|
| Sun | 274.0 | 27.90 | Star |
| Mercury | 3.70 | 0.377 | Rocky planet |
| Venus | 8.87 | 0.905 | Rocky planet |
| Earth | 9.807 | 1.000 | Rocky planet (reference) |
| Moon | 1.62 | 0.166 | Natural satellite |
| Mars | 3.72 | 0.379 | Rocky planet |
| Jupiter | 23.12 | 2.360 | Gas giant |
| Saturn | 10.44 | 1.065 | Gas giant |
| Uranus | 8.87 | 0.905 | Ice giant |
| Neptune | 11.15 | 1.140 | Ice giant |
| Pluto | 0.62 | 0.063 | Dwarf planet |
Surface gravitational acceleration relative to Earth (1.000 = Earth gravity, 9.807 m/s^2). Multiply your Earth weight by the factor to get your weight on that body.
Frequently asked questions
How much would I weigh on Mars?
Mars has a surface gravity of about 3.72 m/s^2, which is 37.9% of Earth's 9.807 m/s^2. To find your weight on Mars, multiply your Earth weight by 0.379. For example, a person who weighs 70 kg on Earth would weigh about 26.5 kg on Mars.
Would I weigh more or less on Jupiter?
More. Jupiter's surface gravity at its cloud tops is about 23.1 m/s^2, giving a ratio of roughly 2.36 compared to Earth. A 70 kg person on Earth would weigh about 165 kg at Jupiter's cloud-top reference level. Note that Jupiter has no solid surface, so this is a theoretical measurement at the 1-bar pressure level.
Why does Saturn have almost the same gravity as Earth?
Saturn is massive but also very large in radius and much less dense than Earth - in fact it is the least dense planet in the solar system and would float in water if the ocean were large enough. Because weight depends on both mass and radius (g = GM/r^2), these factors partially cancel out, leaving Saturn's surface gravity close to Earth's at about 10.44 m/s^2.
Does my mass change on other planets?
No. Mass is the amount of matter you contain and does not change with location. Weight is the gravitational force acting on that mass, so it varies from planet to planet. Your mass in kilograms is constant everywhere in the universe; only your weight in newtons (or the equivalent scale reading) changes.
Why is the Moon included? It is not a planet.
The Moon is included because it is the most visited extraterrestrial body by humans and a very common reference point for understanding how gravity varies across the solar system. Pluto and the Sun are also included for educational completeness, even though Pluto is now classified as a dwarf planet.
How is the weight on the Sun calculated?
The Sun's surface (photosphere) has a gravitational acceleration of about 274 m/s^2, which is roughly 27.9 times Earth's. A person weighing 70 kg on Earth would experience a gravitational force equivalent to about 1953 kg on the solar surface - though of course no person could survive there.
What units can I use?
This calculator accepts kilograms (kg), pounds (lb), stone (st), and newtons (N). All outputs are shown in the same unit you entered. Stone is a unit used mainly in the United Kingdom and Ireland: 1 stone = 14 pounds = 6.35 kg.