# Escape Velocity Calculator

Our escape velocity calculator serves as a quick way of estimating the **escape velocity formula** for any planet or star you want. You can immediately use the tool next to the text or check the article below to learn what the **escape velocity of Earth** is and how to use the escape speed formula in practice.

The escape velocity calculator uses the considerations of the gravitational force definition. We have prepared a separate article about this force. Be sure to check it!

## Escape velocity formula

The escape velocity equation is simple to remember, and it originates from comparing the gravitational and centrifugal force formulae. It has the following form:

where:

- $v_e$ - The escape velocity, which is the
**minimum speed**an object needs to leave the surface of a celestial body, e.g., a planet; - $G \approx 6.67\times10^{-11} \text{ m}^3 \cdot \text{kg}^{-1} \cdot \text{s}^{-2}$ - The universal gravitational constant. It is also helpful if you need to know how to calculate orbital period.
- $M$ - The mass of the celestial body;
- $R$ - The radius of the celestial body.

You can use the escape velocity equation to **estimate the amount of work** (or energy) you need to put into the object to **leave a planet permanently**. To do so, find the escape velocity and use its value, e.g., in the with a final speed of 0 m/s.

## How to use the escape velocity calculator

To use the built-in escape speed formula in our tool, you need to provide it with two inputs:

- $\text{Mass}$ - The planet's mass you want to escape from. If you want to
**find the escape velocity of Earth**, change the units to $\text{weights of the Earth}$ and type in the number $1$. The value of $1 \text{ Earth}$ equals about $5.972\times10^{24} \text{ kg}$. - $\text{Radius}$ - The planet's radius. Similarly, you can select appropriate units of $\text{Earth radii}$ and enter $1 \text{ R⊕}$ which is about $6,371 \text{ km}$.
- The escape velocity calculator will quickly find the escape velocity, which you can display in various units. For Earth, it has a constant value of about
**11.2 km/s or 25 mph**.

If you need more calculations regarding the Earth's orbit, our satellite velocity calculator might be precisely the tool you're looking for. Be sure to check it!