Escape Velocity Calculator
Calculate the minimum speed needed to escape the gravity of a planet or moon from its mass and radius, using v = √(2GM / r).
- In km/s
- 11.186 km/s
Formula: v = √(2 × G × M / r)
About Escape Velocity Calculator
Escape Velocity Calculator is a free online calculator that gives you an instant, accurate result as you type. Calculate the minimum speed needed to escape the gravity of a planet or moon from its mass and radius, using v = √(2GM / r).
The calculation uses the standard formula v = √(2 × G × M / r) and updates live with every change to the inputs. Everything runs client-side in your browser — fast, private, and free to use as often as you like.
Earth's escape velocity is about 11.2 km/s, while the Moon's is only 2.4 km/s — one reason lunar launches need far less fuel.
Frequently Asked Questions
Is Escape Velocity Calculator free to use?
Yes. Escape Velocity Calculator is completely free, with no sign-up, no downloads, and no usage limits. You can use it as many times as you like on any device with a web browser.
How accurate is this calculator?
The calculator applies the standard formula (v = √(2 × G × M / r)) with full floating-point precision and rounds only the displayed result. For most practical purposes the results are exact.
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