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 = ?