Why does my weight change on other planets?

Weight is the force of gravity acting on your mass. Since each planet has a different mass and radius, its surface gravity differs from Earth's, so your weight — but not your mass — changes.

Does this change my actual mass?

No. Mass is constant regardless of location. Only the gravitational force (weight) changes. Your mass in kilograms stays the same on every planet.

Why is Pluto included if it is no longer a planet?

Pluto was reclassified as a dwarf planet in 2006, but it remains a popular and interesting comparison point. Its surface gravity is just 0.063 g, making it one of the lowest in the solar system.

How accurate are the gravity values used?

The surface gravity ratios are sourced from NASA planetary fact sheets and are accurate to three significant figures. They represent average surface gravity at the equator.

What does "surface gravity" mean for gas giants?

Gas giants like Jupiter and Saturn have no solid surface. The gravity figure represents the effective gravity at the top of their cloud layer, which scientists use as a conventional reference point.

What would a 200 lb person weigh on Mars?

A 200 lb person would weigh approximately 75.8 lb on Mars. Because Mars has about 37.9% of Earth's surface gravity (0.379 g), you multiply 200 lb by 0.379 to get the result.

Planet Weight Calculator

Enter your Earth weight in pounds or kilograms and instantly see how much you would weigh on every planet, the Moon, and Pluto.

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Surface gravity ratios sourced from NASA planetary fact sheets. Gas giants show gravity at the cloud-top reference level.

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Summary

This calculator uses the surface gravity of each body relative to Earth to show how your weight would change across the solar system. Because gravity varies by mass and radius, a 150 lb person weighs only 57 lb on Mars but a crushing 378 lb on Jupiter. All math is performed instantly in your browser.

How it works

Enter your weight on Earth in the input field.
Select your preferred unit: pounds (lb) or kilograms (kg).
The calculator multiplies your Earth weight by each body's gravity ratio to get your weight there.
Results update in real time as you type.
Click any planet card to copy that weight to your clipboard.

Use cases

Satisfy curiosity about how heavy you would feel on Jupiter.
Use in classroom physics lessons about gravity and weight.
Compare the low gravity of the Moon to Mars for space mission planning discussions.
Create fun social media posts about your interplanetary weight.
Illustrate the difference between mass and weight to students.
Explore sci-fi scenarios and realistic gravity for world-building.

Frequently Asked Questions

Last updated: 2026-05-29 · Reviewed by Nham Vu