Enter the total energy (Joules, J) into the Mass From Energy Calculator. The calculator will evaluate and display the mass.

## Mass From Energy Formula

The following formula is used to calculate the Mass From Energy.

M = E / c^2
• Where M is the Mass From Energy (kg)
• E is the total energy (Joules, J)
• c is the speed of light (299,792,458 m/s)

To calculate mass from energy, divide the energy by the speed of light squared.

## How to Calculate Mass From Energy?

The following example problems outline how to calculate Mass From Energy.

Example Problem #1:

1. First, determine the total energy (Joules, J).
• The total energy (Joules, J) is given as: 150,000,000,000.
2. Finally, calculate the Mass From Energy using the equation above:

M = E / c^2

The values given above are inserted into the equation below and the solution is calculated:

M = 150,000,000,000 / 299792458^2 = .000001668 (kg)

Example Problem #2:

For this problem, the variables needed are provided below:

total energy (Joules, J) = 3,000,000,000

This example problem is a test of your knowledge on the subject. Use the calculator above to check your answer.

M = E / c^2 = ?