Free Mass-Energy Calculator
Calculate energy from mass using Einstein's famous equation E = mc².
kg
Energy (J)
89,875,517,873,681,760 J
Energy (MeV)561,020,710,821,983,600,000,000,000,000 MeV
Energy (kWh)24,965,421,632 kWh
Energy (J) vs Mass
Mass-Energy Equivalence
Einstein's equation reveals that mass and energy are interchangeable.
Formula
E = mc²
where c = 299,792,458 m/s is the speed of light. A tiny amount of mass corresponds to an enormous amount of energy. This is the principle behind nuclear power and nuclear weapons.
Example Calculation
1 kg of matter fully converted to energy.
- 01E = mc²
- 02E = 1 * (2.998e8)²
- 03E = 8.988e16 J
- 04E = 2.497e10 kWh
- 05That is about 21.5 kilotons of TNT equivalent.
Frequently Asked Questions
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