A particle meets its antiparticle and both are converted into radiation. Set the antimatter mass and watch E = 2mc² — the 2 is there because an equal mass of ordinary matter is destroyed alongside it. Switching species changes how the energy is parcelled up, never how much there is.
Total energy released E = 2mc²
1.79751e11 J
42.96 t TNT
Antimatter mass1.000 mg
1 ng1 µg1 mg1 g
Annihilating pair
Annihilation events N = m / mparticle
1.0978e24
one event per electron-positron pair
Energy per event 2mparticlec²
1.0220 MeV
2 photons, 0.511 MeV each, back to back
Usable energy: about 100%. Every event ends in gamma photons, so essentially all of the released energy is in principle catchable.
c = 299792458 m/s · me = 9.10938e-31 kg · mp = 1.67262e-27 kg · 1 kt TNT = 4.184e12 J
Tip: switch species and watch the two lower bars swap places by the same distance. The mass slider moves the total; the species buttons only split it differently.