`m = E / c^2`

Enter a value for all fields

The m = E/c² calculator compute uses Einsteins Special Relativity formula to compute the mass of an object, given the Energy (E) of an mass at rest and  the speed of light (c).

INSTRUCTIONS: Choose units and enter the following:

E - Energy that exists in a mass at rest. 

Mass from Energy (m): The calculator returns the mass in kilograms.  However, this can be automatically converted to compatible units via the pull-down menu.

Related Calculators:

• E = m•c² (mass/energy equivalent)
• m = E/c² (mass from energy)
• E = m•γ•c² (mass/energy equivalent not at rest)
• E = h•ν (Quantum Energy)
• p = m•γ•v (Relativistic Momentum)
• c (Speed of light)
• γ ≈ 1 + v²/(2c²)
• KE≈m(1+v²/(2c²)-1)c²(Relativistic Kinetic Energy)

REFERENCE

A helpful and more detailed explanation can be found at http://www.emc2-explained.info/Emc2/Basics.htm