Planet Weight Calculator
Calculate your weight on any planet in the solar system based on surface gravity. Enter values for instant results with step-by-step formulas.
Reviewed by Daniel Agrici, Founder & Lead Developer
Formula
Weight on Planet = Earth Weight × (Planet Surface Gravity ÷ Earth Surface Gravity)
Your weight on any celestial body is proportional to its surface gravity compared to Earth's. Surface gravity (g) is determined by the body's mass and radius: g = GM/r². Earth's surface gravity is 9.81 m/s².
Worked Examples
Example 1: Weight on Mars
Problem:A 70 kg person wants to know their weight on Mars.
Solution:Mars gravity = 3.72 m/s², Earth gravity = 9.81 m/s²\nRatio = 3.72 / 9.81 = 0.379\nWeight on Mars = 70 × 0.379 = 26.55 kg-equivalent
Result:26.55 kg on Mars (37.9% of Earth weight)
Example 2: Weight on Jupiter
Problem:A 150 lb person wants to know their weight on Jupiter.
Solution:Jupiter gravity = 24.79 m/s², Earth gravity = 9.81 m/s²\nRatio = 24.79 / 9.81 = 2.527\nWeight on Jupiter = 150 × 2.527 = 379.1 lbs
Result:379.1 lbs on Jupiter (252.7% of Earth weight)
Frequently Asked Questions
How is a planet's surface gravity calculated?
Surface gravity g = GM/r^2, where G is the gravitational constant (6.674e-11), M is the planet's mass, and r is its radius. Mars has about 38% of Earth's gravity, Jupiter about 253%. Surface gravity affects atmosphere retention, weight, and the energy needed to launch from the surface.
What determines whether a celestial object is a planet, dwarf planet, or asteroid?
Under the IAU definition, a planet orbits the Sun, has enough mass for a nearly round shape, and has cleared its orbital neighborhood of other debris. A dwarf planet meets the first two criteria but has not cleared its orbit (like Pluto). Asteroids are smaller rocky bodies that have not achieved hydrostatic equilibrium.
References
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy