Weight Calculator

Calculate your weight on different planets and celestial bodies, or convert between mass and weight using W = m × g.

Mode

Weight Across Planets

Enter a mass to see results.

This free weight calculator finds how much you (or any object) would weigh on different planets and celestial bodies, based on each body's gravitational acceleration, or converts between mass and weight using the physics formula W = m × g. It's a popular tool for students, teachers, and space enthusiasts curious how gravity changes weight across the solar system.

How Weight Is Calculated

Weight (W) = Mass (m) × Gravitational Acceleration (g)

Mass stays constant everywhere in the universe, but weight, the force gravity exerts on that mass, changes depending on the gravitational pull of the planet or body you're standing on. Earth's gravity is 9.807 m/s², while the Moon's is about 1.62 m/s² (roughly 1/6th of Earth's), and Jupiter's is about 24.79 m/s² (roughly 2.5 times Earth's).

Weight is typically measured in newtons (N) in physics, though this calculator also converts to pounds-force (lbf) for easier comparison.

How to Use This Calculator

  1. Choose "Weight on Planets" to see your weight across the solar system, or "Mass ↔ Weight" to convert between the two
  2. Enter your mass and select its unit (kg, lb, etc.)
  3. For the planets mode, your weight on every planet, the Moon, and the Sun is calculated automatically
  4. For the converter, enter a gravitational acceleration value (or use Earth's default) and convert either direction
  5. Results update instantly as you change any value

Frequently Asked Questions

What's the difference between mass and weight?

Mass is the amount of matter in an object and never changes, measured in kilograms or pounds. Weight is the force of gravity acting on that mass, measured in newtons or pounds-force, and it changes depending on the gravitational field you're in.

Why would I weigh less on the Moon?

The Moon's gravity is only about 1/6th as strong as Earth's, so an object with the same mass experiences much less gravitational force there. A 70 kg person who weighs about 686 N on Earth would weigh only about 114 N on the Moon, despite having the same mass.

Which planet would I weigh the most on?

Among the planets, Jupiter has the strongest surface gravity in our solar system (about 2.5 times Earth's), so you'd weigh the most there. The Sun's gravity is far stronger still, at roughly 28 times Earth's, though it isn't a solid surface you could stand on.

Is weight the same as pounds on a bathroom scale?

A bathroom scale technically measures the force of gravity on your mass, which is weight, but it displays the result in units of mass (pounds or kilograms) as a convenience, since we're always using it on Earth where gravity is constant.