Escape Velocity Calculator

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Calculates the minimum speed needed for an object to escape the gravitational influence of a celestial body.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Mass of Celestial Body (kg), Radius of Celestial Body (m), and Gravitational Constant (G) (m³/kg s²) in the units shown.

Step 2

Read Escape Velocity (m/s) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Earth

Mass of Celestial Body (kg): 5,972,000,000,000,000,000,000,000 kg; Radius of Celestial Body (m): 6,371,000 m; Gravitational Constant (G) (m³/kg s²): 0.000000000066743 m³/kg s²

Escape Velocity (m/s): 11,185.97789 m/s

Moon

Mass of Celestial Body (kg): 73,476,730,900,000,000,000,000 kg; Radius of Celestial Body (m): 1,737,100 m; Gravitational Constant (G) (m³/kg s²): 0.000000000066743 m³/kg s²

Escape Velocity (m/s): 2,376.185614 m/s

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