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Escape Velocity Calculator

Find the minimum speed an object must reach to escape a celestial body's gravity without further propulsion. Essential for mission planning, planetary science, and understanding why some atmospheres are retained.

Body Mass (kg)

Body Radius (km)

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Astronomy

Orbital Velocity Calculator

Compute the orbital velocity around a central body using v = √(GM/r) × √(1+e), an approximation that scales the circular-orbit speed by the eccentricity. Useful for first-order estimates of satellite velocities, planetary orbital speeds, and binary star systems.

Central Body Mass (kg)

Orbital Radius (meters)

Orbital Eccentricity

Fill in the required fields to see your result.

Key differences

	Escape Velocity Calculator	Orbital Velocity Calculator
Category	Astronomy	Astronomy
Inputs required	2	3
Result	Escape Velocity (km/s)	Orbital Velocity (m/s)
What it does	Find the minimum speed an object must reach to escape a celestial body's gravity without further propulsion. Essential for mission planning, planetary science, and understanding why some atmospheres are retained.	Compute the orbital velocity around a central body using v = √(GM/r) × √(1+e), an approximation that scales the circular-orbit speed by the eccentricity. Useful for first-order estimates of satellite velocities, planetary orbital speeds, and binary star systems.