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Escape Velocity Calculator

Speed needed to escape a celestial body's gravity.

Compute the escape velocity from a celestial body's surface from its mass and radius.

Daniel Oh By Daniel Oh
Reviewed by Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

kg
m

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

v_esc = √(2 · G · M / R), with G = 6.6743 × 10⁻¹¹ N·m²/kg².

In depth

Compute the escape velocity from a celestial body's surface from its mass and radius.