Weight Other Planets Calculator

Report an Issue

Help us improve by telling us what went wrong.

Embed this Tool

Customize and copy the embed code for your website.

Ever Wondered How Much You Would Weigh on Mars?

Your weight is not a fixed property - it depends entirely on the gravitational pull of whatever celestial body you happen to be standing on. On the Moon, you would weigh about one-sixth of your Earth weight. On Jupiter, you would feel nearly two and a half times heavier. The Weight on Other Planets Calculator takes your Earth weight and shows you what the bathroom scale would read on every planet in our solar system, plus the Moon, Pluto, and a few other noteworthy celestial bodies. It is part fun curiosity, part genuine science education.

Why Weight Changes But Mass Stays the Same

This is the single most important concept to understand. Your mass - the amount of matter in your body - is constant everywhere in the universe. Whether you are on Earth, Mars, or floating in deep space, you contain the same amount of stuff. But weight is mass times gravitational acceleration, and gravitational acceleration varies from body to body. Earth's surface gravity is about 9.81 meters per second squared. Mars has about 3.72. Jupiter has roughly 24.79. The Weight on Other Planets Calculator multiplies your mass by each planet's surface gravity to produce your weight on that world.

How to Use the Calculator

Enter your weight in the unit you prefer - kilograms, pounds, or newtons. Specify that this is your Earth weight (the tool assumes Earth by default). Hit calculate, and you get a complete table showing your weight on Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, the Moon, and Pluto. Each result includes the planet's surface gravity relative to Earth, so you can see at a glance that Jupiter's gravity is 2.53 times Earth's while the Moon's is only 0.166 times. The Weight on Other Planets Calculator makes the comparison visual and immediate.

The Results Might Surprise You

Consider a person who weighs 70 kilograms (about 154 pounds) on Earth:

Mercury: Roughly 26.5 kg. Mercury is small and dense, with only 38 percent of Earth's surface gravity. You would feel remarkably light.

Venus: About 63.4 kg. Venus is nearly Earth's twin in size and mass, so the gravity is close - 91 percent of Earth's. You would barely notice the difference.

Mars: Around 26.5 kg. Despite being smaller than Earth, Mars has a surprisingly similar surface gravity to Mercury because of its lower density. Martian explorers would bounce around at barely a third of their Earth weight.

Jupiter: A crushing 177 kg. Jupiter's immense mass creates surface gravity 2.53 times Earth's. Every step would feel like carrying another person on your back.

Saturn: About 74.6 kg - slightly more than Earth despite Saturn being vastly more massive. Saturn's enormous radius spreads the gravitational effect thin at the "surface" (which is really the top of its atmosphere).

The Moon: Just 11.6 kg. This is why Apollo astronauts could bounce and hop in their heavy spacesuits - the suits weighed about 82 kilograms on Earth but only about 13.6 kilograms on the Moon.

Educational Value for Students

The Weight on Other Planets Calculator is a fantastic teaching tool for science classes. It makes the abstract concepts of mass, weight, and gravity tangible and personally relevant. When a student sees that they would weigh less than a house cat on Pluto, or that lifting a textbook on Jupiter would feel like lifting a small dumbbell on Earth, the physics comes alive. Teachers can use the calculator for interactive lessons, homework problems, and science fair presentations.

The Science Behind Surface Gravity

A planet's surface gravity depends on two factors: its mass and its radius. More mass means stronger gravity. But a larger radius means you are farther from the center of mass, which weakens gravity (gravity follows an inverse-square relationship with distance). That is why Saturn, despite being 95 times more massive than Earth, has only slightly higher surface gravity - its enormous radius counteracts the extra mass. The calculator uses the most current accepted values for each body's surface gravity, sourced from NASA data.

Beyond the Main Planets

The calculator also includes several bonus bodies: Pluto (technically a dwarf planet but still beloved), the Moon, and select moons of other planets like Europa and Titan. These are increasingly relevant as space agencies plan missions to these destinations. Knowing how gravity would affect equipment, mobility, and construction on these worlds is not just trivia - it is active mission planning.

Fun, Free, and Scientifically Accurate

The Weight on Other Planets Calculator runs entirely in your browser. No account needed, no data collected, no server processing. Enter your Earth weight, explore the solar system, and gain a visceral understanding of how gravity shapes our physical experience. It is the kind of tool that starts as a curiosity and ends as a genuine learning experience - try it and see where in the solar system you would feel most at home.