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Surface Gravity Calculator

Find the surface gravity of any planet relative to Earth.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

This calculator computes a planet or body's surface gravity from g = GM/r², then expresses it relative to Earth's 9.8 m/s² so the result reads as a simple multiplier like 0.38g for Mars or 2.5g for Jupiter.

Astronomy students, sci-fi writers, and space enthusiasts use it to compare how heavy an object — or a person — would feel on another planet, moon, or exoplanet given its mass and radius. Enter the mass and radius to get surface gravity in both m/s² and Earth-relative units.

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