Escape Velocity Calculator
Escape velocity from a planet or moon's mass and radius.
Enter your values
Enter the body mass in kg.
Enter the body radius in m.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Escape velocity
- 11186 m/s
- Escape velocity
- 11.19 km/s
- Escape velocity
- 25022 mph
Quick answer
Escape velocity v = sqrt(2GM/r).
v = sqrt(2GM/r)
At a glance
| What it does | Escape velocity from a planet or moon's mass and radius. |
|---|---|
| Category | Physics |
| Inputs needed | Body mass, Body radius |
| Main output | Escape velocity |
| Formula | v = sqrt(2GM/r) |
| Cost | Free — no sign-up, no download |
How to use the Escape Velocity Calculator
- 1Enter the mass and radius of the planet or moon (Earth defaults are prefilled).
- 2The calculator applies the escape velocity formula using the gravitational constant.
- 3Compare results across planets by changing the mass and radius.
Inputs explained
- Body mass(kg)
- Enter the body mass in kg.
- Body radius(m)
- Enter the body radius in m.
Worked example
Using the values the calculator loads with:
Inputs
- Body mass5.972e24 kg
- Body radius6371000 m
Results
- Escape velocity11186 m/s
- Escape velocity11.19 km/s
- Escape velocity25022 mph
Frequently asked questions
What is Earth's escape velocity?
About 11.2 km/s (roughly 25,000 mph) from the surface.
Does escape velocity depend on launch direction?
The ideal formula ignores atmosphere and rotation; real launches account for those factors too.
What do I need to enter into the Escape Velocity Calculator?
Just 2 values: body mass, body radius. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Escape Velocity Calculator work out the answer?
Escape velocity v = sqrt(2GM/r). It applies the formula v = sqrt(2GM/r) and shows the working so you can check each step by hand.
Is the Escape Velocity Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.