# Einstein Mass Energy Calculator

Einstein's mass energy states the amount of energy possessed by an object is equal to the mass multiplied by the square of the speed of light (c = about 3×10^{8} m/s). The equation E = mc^{2} states that energy and mass are interchangeable among each other. Use our online Einstein mass energy calculator to calculate between energy, mass or speed of light based on the other two values.

## Calculate Energy, Mass, Speed of Light in a Vacuum.

In other words, the equation states that any object that possessing mass has an equivalent amount of energy and vice versa. Use the Einstein mass energy formula given above to calculate the mass, energy and speed.