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Astronomy Calculators

Escape Velocity Calculator

Speed needed to escape a planet or star’s gravity, for the solar system bodies or a custom mass.

Enter values

Results update as you type.

Result

Escape velocity

11.186 km/s

In m/s
11,186
In mph
25,022
Circular orbit speed
7.9097 km/s
Surface gravity
9.82 m/s²

About the Escape Velocity Calculator

Speed needed to escape a planet or star’s gravity, for the solar system bodies or a custom mass.

Also known as: escape speed, how fast to leave earth, escape velocity formula, orbital escape.

How to use this calculator

  1. Enter body.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

v_esc = √(2GM / r)

Worked example

Using the values pre-filled in the calculator above:

  • Body: Earth

the calculator returns:

  • Escape velocity: 11.186 km/s
  • In m/s: 11,186
  • In mph: 25,022
  • Circular orbit speed: 7.9097 km/s