Escape Velocity Calculator
Calculate the minimum speed needed to escape a celestial body's gravitational pull.
About this calculator
The Escape Velocity Calculator on NumberCals is a free, mobile-friendly tool for anyone needing to calculate the minimum speed needed to escape a celestial body's gravitational pull. Enter your values in the form below and the result is computed instantly — no sign-up, no installation, no waiting.
Formula used
v_escape = √(2GM/r)
What you'll need
- Celestial Body
- Mass (kg, only if 'Custom') (e.g. 5.972e24)
- Radius (m, only if 'Custom') (e.g. 6371000)
What you'll get
- Escape Velocity (m/s)
- Escape Velocity (km/s)
- Escape Velocity (km/h)
Formula
v_escape = √(2GM/r)
Result
Frequently Asked Questions
What's Earth's escape velocity? +
About 11.2 km/s (40,270 km/h). That's the speed needed to leave Earth's gravity entirely with no further propulsion — though real spacecraft don't actually need this speed, because they keep thrusting.
Black hole? +
A black hole's escape velocity exceeds the speed of light — which is why light cannot escape from inside the event horizon.
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