Weight from Mass Calculator
Calculate the gravitational weight of any mass on Earth or other planets.
Compare weight across the solar system from Mercury to Neptune.
Weight and mass are different. Mass is the amount of matter in an object — it stays the same everywhere in the universe. Weight is the gravitational force acting on that mass:
W = m × g
Where W is weight in newtons (N), m is mass in kilograms, and g is the surface gravitational acceleration of the celestial body.
On Earth, g = 9.81 m/s². A 70 kg person weighs 70 × 9.81 = 686.7 N (about 154 lbs-force).
Surface gravity of solar system bodies:
- Mercury: 3.70 m/s² (38% of Earth)
- Venus: 8.87 m/s² (90% of Earth)
- Earth: 9.81 m/s²
- Moon: 1.62 m/s² (17% of Earth) — a 70 kg person weighs just 113.4 N there
- Mars: 3.72 m/s² (38% of Earth)
- Jupiter: 24.79 m/s² (253% of Earth)
- Saturn: 10.44 m/s² (106% of Earth)
- Uranus: 8.69 m/s² (89% of Earth)
- Neptune: 11.15 m/s² (114% of Earth)
The popular misconception: astronauts in the International Space Station are not weightless because there is no gravity. They are in a continuous free fall — the station is falling toward Earth just fast enough that Earth curves away beneath it. They feel weightless because everything around them is falling at the same rate. True weightlessness only exists at gravitational equilibrium points in deep space.
Converting newtons to pounds-force: 1 N ≈ 0.2248 lbs-force.
The chart shows your weight (N) across the solar system.