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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 the units and enter the following:

- (
**r**) This is the radius of the planet. - (
**a**) This is the acceleration due to gravity on the surface of the 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

Compute the mass of a planet given the acceleration at the surface and the radius of the planet.

- 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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