Frequently Asked Questions
Common questions about the Escape Velocity Calculator.
What is escape velocity?
The minimum speed an object needs to break free of a body's gravity without further propulsion, given by v = √(2GM/r).
How does this calculator work?
Pick a preset body or enter a custom mass and radius, and it computes the escape velocity instantly using the standard formula.
Is it free?
Completely free, no sign-up, downloads, or limits.
What is Earth's escape velocity?
About 11.19 km/s (roughly 40,270 km/h).
Can I calculate escape velocity for a custom object?
Yes, switch to custom mode and enter any mass (kg) and radius (km).
What units are the results shown in?
m/s, km/s, km/h, and mph, all calculated together.
What happens if I enter a radius of zero?
The calculator flags this as invalid input instead of returning an error or infinite value.
Does the calculator show the formula used?
Yes, the substituted formula and values are shown alongside the result.
Is my data stored?
No; everything runs in your browser and isn't stored or sent anywhere.
Does it work on mobile?
Yes, fully responsive on all screen sizes.