Antimatter Energy Calculator
How much energy is released when matter meets antimatter? Enter a mass and instantly see the total annihilation energy with real-world comparisons.
Antimatter Mass
Formula: E = (2m)c² — matter and an equal mass of antimatter annihilate completely, converting 100% of the rest mass into energy.
1.798e+14 J
Real-World Comparisons
About Antimatter Annihilation
When a particle meets its antiparticle, both are completely converted into energy according to Einstein's famous equation E = mc². Because both masses are converted, the total energy is E = (2m)c² for every gram of antimatter reacting with a gram of matter.
How efficient is it?
Antimatter annihilation is the most energy-dense reaction known to physics — about 100× more energetic per kilogram than nuclear fusion and roughly 10 billion times more than chemical combustion. Just 1 gram of antimatter reacting with 1 gram of matter releases roughly 1.8×10¹⁴ joules — about 43 kilotons of TNT, or nearly 3 Hiroshima bombs.
Where does the energy go?
Most annihilations produce gamma-ray photons, neutrinos, and lighter particles. In a hypothetical antimatter weapon or rocket, this energy could be directed via magnetic confinement, but in practice less than 100% would be usefully captured.