Planet Weight Calculator
Find your weight on any planet, moon, or the Sun by entering your mass.
How it works
- 1Enter your mass in kilograms or pounds and choose a celestial body from the dropdown.
- 2The calculator looks up the body’s mean surface gravity (m/s²) and applies w = m × g.
- 3Your weight is shown in newtons or pound-force, with the body’s surface gravity and its ratio to Earth’s.
Use cases
- Students exploring how gravity varies across the solar system.
- Science communicators illustrating why astronauts feel lighter on the Moon or heavier on Jupiter.
- Curious readers comparing their weight across all 11 bodies from one mass input.
Frequently asked questions
How is weight on another planet calculated?
Weight is the gravitational force on an object: w = m × g, where m is mass in kilograms and g is the body’s mean surface gravity in m/s². On Earth a 70 kg person weighs 70 × 9.80665 ≈ 686.5 N.
Does my mass change between planets?
No. Mass is intrinsic and stays constant everywhere; only your weight changes. A 70 kg person is still 70 kg on the Moon but weighs about 113 N (≈ 25 lbf) there instead of 687 N, because the Moon’s gravity is about 1/6 of Earth’s.
How much would a 70 kg person weigh on the Moon versus Earth?
On Earth: 70 × 9.80665 ≈ 687 N (154 lbf). On the Moon (g = 1.62 m/s²): 70 × 1.62 ≈ 113 N (25 lbf) — about one-sixth, while mass stays 70 kg.
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