Free Mass-Energy Equivalence Calculator
Calculate the energy equivalent of a mass using Einstein's famous equation: E = m * c^2.
kg
Energy
89,880,040,000,000,000.0000 J
Energy (MeV)561,048,938,826,466,900,000,000,000,000.0000 MeV
Energy (kWh)24,966,677,777.78 kWh
Energy vs Mass
Mass-Energy Equivalence
Einstein showed that mass and energy are interchangeable, related by the speed of light squared.
Formula
E = mc^2
One kilogram of matter, if fully converted to energy, yields about 9 x 10^16 joules, roughly the energy of a 21-megaton nuclear weapon.
Example Calculation
Energy equivalent of 1 kg.
- 01E = mc^2
- 02E = 1 * (2.998e8)^2
- 03E = 8.988e16 J
- 04E = 2.497e10 kWh = 25 billion kWh
Frequently Asked Questions
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