What is escape velocity?

It is the minimum speed an object needs to break free from a body's gravity without further propulsion, ignoring air resistance.

What formula is used?

Escape velocity v = √(2GM / r), where G is the gravitational constant 6.6743×10⁻¹¹, M is mass in kg and r is radius in metres.

Does it depend on the mass of the object leaving?

No — escape velocity depends only on the mass and radius of the body you are escaping, not on the object leaving it.

Escape Velocity Calculator

Work out the speed needed to escape any body's gravity.

Escape velocity calculator

Escape velocity is the speed needed to break free from a body’s gravity with no further thrust. This tool uses the standard formula v = √(2GM / r) with the gravitational constant G = 6.6743×10⁻¹¹ m³·kg⁻¹·s⁻².

Pick a preset such as Earth (≈11.2 km/s), the Moon, Mars, Jupiter or the Sun, or enter your own mass and radius. Everything is computed in your browser — nothing is uploaded.