Escape Velocity Calculator
Escape velocity is the minimum speed an object needs to break free of a body gravity without any further push, ignoring air drag. It comes from setting kinetic energy equal to gravitational potential energy, giving the square root of two times the gravitational constant times the mass, divided by the radius. Earth value is about eleven point two kilometers per second, which is why rockets must be so powerful. This calculator takes the mass in kilograms and the radius in meters and returns the escape velocity in meters per second, kilometers per second and as a multiple of Earth value, so you can compare worlds. Preset buttons load the Moon, Earth, Jupiter and the Sun. Everything computes in your browser.
How to use Escape Velocity Calculator
- Enter the mass of the planet, moon or star.
- Enter its radius in matching units.
- Read the escape velocity in meters per second and kilometers per second.
Frequently asked questions
What formula sets escape velocity?
It uses the square root of two times G times the mass divided by the radius, so escape speed rises with mass and falls as the launch radius grows.
Does escape velocity depend on the escaping object mass?
No; the speed needed to escape depends only on the central body mass and radius, not on how heavy the rocket or particle leaving is.
Why is Earth escape velocity about 11.2 km/s?
Plugging Earth mass and radius into the formula yields roughly 11.2 km/s, the speed an unpowered object needs at the surface to never fall back.
What is Escape Velocity Calculator?
Escape velocity is the minimum speed an object needs to break free of a body gravity without any further push, ignoring air drag. It comes from setting kinetic energy equal to gravitational potential energy, giving the square root of two times the gravitational constant times the mass, divided by the radius.
Is Escape Velocity Calculator free to use?
Yes. Escape Velocity Calculator is completely free, with no sign-up and no usage limits.
Does Escape Velocity Calculator work in a web browser?
Yes. Escape Velocity Calculator runs in any modern web browser. There is nothing to download or install.
Is my data private with Escape Velocity Calculator?
Yes. Escape Velocity Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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