Weight on other planets
Enter your weight on Earth, see it across the solar system.
How do I calculate my weight on another planet?
Multiply your weight on Earth by the planet’s surface gravity and divide by Earth’s. The calculator uses NASA’s Planetary Fact Sheet, where Earth’s gravity is 9.8 m/s².
How much would I weigh on Mars?
Mars’s gravity is 3.7 m/s², so 150 lb on Earth is 150 × 3.7 ÷ 9.8 = 56.6 lb on Mars.
Where would I weigh the most?
On Jupiter, at 23.1 m/s² — about 2.4 times your Earth weight. Jupiter has no solid surface: for the gas giants NASA gives gravity at the level where the atmospheric pressure is 1 bar.
Does my mass change?
No — mass is the amount of matter in you and stays the same everywhere. Weight is the pull of gravity on that mass, so it changes from world to world.
How strong is gravity on the Moon?
1.6 m/s², about one-sixth of Earth’s: 150 lb on Earth is about 24.5 lb on the Moon.
Why is gravity on the Moon only about one-sixth of Earth’s?
Surface gravity is g = GM ÷ r² (OpenStax University Physics, Volume 1, section 13.2). The Moon has about 1.2% of the Earth’s mass (0.07346 against 5.9722 × 10²⁴ kg, NASA) but a radius that is 27% of the Earth’s (1,737.4 km against 6,371 km). Less mass lowers g, the smaller radius raises it, and the net result is 1.62 m/s² against 9.82 m/s², a ratio of 0.165, close to NASA’s 0.166.
On which planets would I weigh about the same as on Earth?
Venus (91% of your Earth weight), Saturn (92%) and Uranus (89%) come within about 12%, as does Neptune at 112%. Only Venus has a solid surface to stand on; for Saturn, Uranus and Neptune NASA’s figure is the gravity at the 1 bar level of the atmosphere. On Venus, 150 lb on Earth would read 136.2 lb.
The formula and what it assumes
Weight is the gravitational force on an object, w = mg, and it changes with location while the mass does not (OpenStax University Physics, Volume 1, section 5.4, Eq. 5.9). The calculator therefore scales your Earth weight by the ratio of surface gravities: weight on the planet = your weight on Earth × g(planet) ÷ g(Earth), with both g taken from NASA’s Planetary Fact Sheet (Earth 9.8 m/s²). NASA gives gravity at the equator, including the effects of rotation, and for Jupiter, Saturn, Uranus and Neptune at the level in the atmosphere where the pressure is 1 bar, since they have no solid surface.
Worked example: a 150 lb person
On the Moon, g = 1.6 m/s², so the weight is 150 × 1.6 ÷ 9.8 = 24.5 lb. On Mars (3.7 m/s²) it is 56.6 lb, on Venus (8.9 m/s²) 136.2 lb, on Neptune (11.0 m/s²) 168.4 lb and on Jupiter (23.1 m/s²) 353.6 lb. In kilograms-force the ratios are the same: a 70 kg person has a mass of 70 kg everywhere, but feels a pull equal to 26.4 kg of Earth weight on Mars.
Common mistakes
Reading the result as a mass is the main one: the calculator gives weight, a force, and your mass is the same on every planet. A kilogram entry is shorthand for the weight of that many kilograms on Earth. The second mistake is trusting a gas giant’s figure as something you could stand on; it is gravity at the 1 bar level of an atmosphere. The third is false precision: NASA’s table gives gravity to only one to three significant figures, so 56.6 lb on Mars is really “about 57 lb”.
Sources: NASA Planetary Fact Sheet (surface gravity row and notes; Earth and Moon fact sheets); OpenStax University Physics, Volume 1, section 5.4 (mass and weight) and section 13.2 (gravitation near the Earth’s surface). Related: age on other planets calculator, gravitational force calculator, escape velocity calculator and force calculator.