Planet Weight Calculator

How to Use the Planet Weight Calculator

Enter your weight as measured on Earth — in pounds, kilograms, or any unit you prefer — and the calculator instantly shows what you would weigh on Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, the Moon, and Pluto. The output uses the same unit you entered. Results update in real time as you type, so you can quickly compare different weights across the solar system.

Weight depends on two factors: your mass and the gravitational pull of the body you are standing on. Since your mass does not change, the difference in weight is entirely due to surface gravity. Each planet has a unique gravity factor relative to Earth. Jupiter's massive size gives it the strongest pull, while tiny Pluto has barely any gravitational tug at all.

Surface Gravity Across the Solar System

Surface gravity depends on a body's mass and radius. A planet with more mass pulls harder, but a larger radius spreads that pull over a bigger surface. The gravity factor relative to Earth (1.0) for each body is approximately: Mercury 0.378, Venus 0.907, Mars 0.377, Jupiter 2.528, Saturn 1.065, Uranus 0.886, Neptune 1.137, the Moon 0.166, and Pluto 0.063. Multiply your Earth weight by any factor to get your weight on that body.

Mass vs. Weight

Mass is an intrinsic property measured in kilograms. It does not change when you travel to another planet. Weight is the force exerted on your mass by gravity, measured in newtons (or expressed informally in pounds or kilograms-force). An astronaut with a mass of 70 kg weighs about 686 N on Earth but only about 114 N on the Moon. The mass stays at 70 kg in both locations.

Why This Matters

Understanding planetary gravity is critical for space mission planning. Engineers must calculate how much fuel is needed to land on and launch from other bodies. Astronauts train in reduced-gravity environments to prepare for the physical challenges of working on the Moon or Mars. Even science educators use planet weight comparisons to help students grasp the difference between mass and weight in a memorable way.

Frequently Asked Questions

How do you calculate weight on other planets?

Multiply your Earth weight by the ratio of the planet's surface gravity to Earth's surface gravity. Each planet has a gravity factor relative to Earth (1.0). For example, Mars has a factor of about 0.38, so a 100 lb person would weigh 38 lb on Mars.

Why do you weigh less on the Moon?

The Moon's surface gravity is about 1/6 of Earth's (factor 0.166) because it has much less mass than Earth. A person weighing 150 lb on Earth would weigh roughly 25 lb on the Moon.

Which planet would you weigh the most on?

Jupiter. It has the strongest surface gravity of any planet in our solar system, with a gravity factor of about 2.528 relative to Earth. A 150 lb person would weigh about 379 lb on Jupiter.

What is the difference between mass and weight?

Mass is the amount of matter in an object and stays the same everywhere, measured in kilograms. Weight is the force of gravity acting on that mass, measured in newtons (or pounds-force). Your mass is identical on Earth and Mars, but your weight changes because gravity differs.

Is Pluto still considered a planet?

Pluto was reclassified as a dwarf planet by the International Astronomical Union in 2006. It is included in this calculator because it remains a popular point of interest. Pluto's surface gravity is very low — about 0.063 times Earth's.