This calculator finds the escape velocity — the minimum speed an object needs to break free of a body's gravity without further propulsion. Enter the body's mass and radius.
What the symbols mean
- v — escape velocity (metres per second).
- G — gravitational constant (auto-filled).
- M — mass of the planet or star (kilograms).
- r — radius from the centre (metres).
Worked example
For Earth (M = 5.97×10²⁴ kg, r = 6.37×10⁶ m) the escape velocity is about 11,200 m/s — roughly 40,300 km/h.