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.
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.
Is my data stored or sent to a server?
No. All calculations run entirely in your browser using JavaScript. No data you enter is ever transmitted to any server or stored anywhere. Your inputs remain completely private.
How accurate are the results from Planet Weight Calculator?
All calculations use established mathematical formulas and are performed with high-precision arithmetic. Results are accurate to the precision shown. For critical decisions in finance, medicine, or engineering, always verify results with a qualified professional.
What formula does Planet Weight Calculator use?
The formula used is described in the Formula section on this page. It is based on widely accepted standards in the relevant field. If you need a specific reference or citation, the References section provides links to authoritative sources.
Can I share or bookmark my calculation?
You can bookmark the calculator page in your browser. Many calculators also display a shareable result summary you can copy. The page URL stays the same so returning to it will bring you back to the same tool.