Enter the mass of the object and the speed of the light calculator to determine the Energy from Mass. 

Mass to Energy Formula

The following equation is used to calculate the Mass to Energy.

E = m*V^2
  • Where E is the Mass to Energy (Joules)
  • m is the mass of the object (kg)
  • V is the speed of light (299792458 m/s)

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

What are the units for Mass to Energy?

The most common units for Mass to Energy are Joules.

How to Calculate Mass to Energy?

Example Problem:

The following example problem outlines the steps and information needed to calculate the Mass to Energy.

First, determine the mass of the object. In this example, the mass of the object is determined to be 5 (kg).

Next, determine the speed of light. For this problem, the speed of light is measured to be (299792458 m/s).

Finally, calculate the Mass to Energy using the formula above: 

E = m*V^2

Inserting the values from above and solving the equation with the imputed values gives: 

E = 5*299792458^2 = 9.95e15 (Joules)