Processing...

`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.

- 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)

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