Surface Gravity Calculator

Frequently Asked Questions

How do I enter a planet mass?

Use scientific notation, for example 5.97e24 kilograms for Earth and 6.371e6 meters for its radius.

Why does radius matter more than mass?

Gravity falls off with the square of the radius but rises only linearly with mass, so radius has a stronger effect on surface gravity.

Provided by AllCalculators.io
Free online calculators for everyday. No registration required.

Estimates for informational purposes only.

Important Disclaimer: Estimates for informational purposes only.

This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.

JavaScript is required to use the interactive calculator above. The questions and answers below remain readable without JavaScript.

How This Calculator Works

Surface gravity is the acceleration that an object feels at the surface of a planet, moon, or star. It follows directly from Newton's law of gravitation: the gravitational constant times the body's mass divided by the square of its radius. A more massive body pulls harder, while a larger radius spreads that pull over a greater distance and weakens it.

Some Reference Values

Earth sits at roughly 9.81, the Moon at about 1.62, Mars near 3.7, and Jupiter at about 24.8 meters per second squared. Massive but diffuse bodies can have surprisingly low surface gravity, while small, dense ones can have very high values.

Tips

Use scientific notation for planetary masses, such as 5.97e24 for Earth.

Radius has a stronger effect than mass because it is squared.

The relative value tells you how heavy you would feel compared to Earth.

Surface Gravity Calculator

Frequently Asked Questions

Related Science Calculators