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๐Ÿš€Escape Velocity Calculator

Calculate the escape velocity of any planet, moon, or star โ€” or enter a custom mass and radius to explore hypothetical worlds.

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km/s
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Free Escape Velocity Calculator

Ever wondered how fast a rocket needs to go to leave Earth โ€” or Jupiter โ€” behind? Our free escape velocity calculator works it out instantly using v = โˆš(2GM/r), the same formula astrophysicists use. Pick a planet, moon, or the Sun from the preset list and see its escape velocity in seconds, or switch to custom mode and enter any mass and radius to explore a hypothetical world.

Results are shown in m/s, km/s, km/h, and mph, alongside a quick comparison to Earth's own escape velocity of 11.19 km/s, so you can see at a glance how much stronger or weaker a body's gravity really is.

Perfect for physics and astronomy homework, science fair projects, or just satisfying curiosity about the universe. No sign-up, no downloads, no limits. See the About page or the FAQ for more.