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`M = { a * ( r )^2}/{G}`

Enter a value for all fields

The **Planet's Mass from Acceleration and Radius** calculator computes the mass of planet or moon based on the radius (**r**), acceleration due to gravity on the surface (**a**) and the universal gravitational constant (G).

**INSTRUCTIONS:** Choose units and enter the following:

- (
**r**) Radius of Planet - (
**a**) Acceleration due to gravity on the surface of Planet

**Planetary Mass (M):** The calculator returns the mass (**M**) in kilograms. However, this can be automatically converted into other mass units via the pull-down menu including the following:

- Earth Masses
- Jupiter Masses
- Solar Masses

This calculator computes the mass of a planet given the acceleration at the surface and the radius of the planet. The formula for the mass of a planet based on its radius and the acceleration due to gravity on its surface is:

M = a⋅r^{2}/G

where:

- M = Mass of the Planet
- a = acceleration due to gravity on the planet surface
- r = radius of the planet
- G = universal gravitational constant

- Kepler's 3
^{rd}Law formula T² = (4π • R³)/(G • M) - Small Angle Formula
- Flux and Magnitude formulas
- Telescope formulas
- Mass formulas
- Relative Size Formulas
- Wavelength Formulas
- Luminosity and other Formulas

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