Mass-Energy Equivalence Calculator
Energy locked in a given mass, expressed in joules, kilowatt-hours and tonnes of TNT.
Results
Energy
89,875,517,873,700
J
Energy
24,965,421.63
kWh
Energy
21,480.7643
t TNT
Equivalent homes for a year
7133
What this tool does
One gram holds about 90 terajoules — roughly the energy released by twenty-one kilotonnes of TNT. No practical process releases anything close to all of it: nuclear fission converts under a thousandth of the fuel's mass, and burning coal converts about a billionth. The comparison to household electricity is there to make the scale readable, not to suggest it is available.
Formula
E = m c²
Variables
| Symbol | Meaning | Unit |
|---|---|---|
m | Mass | g |
E | Energy | J |
KW | Energy | kWh |
TN | Energy | t TNT |
HO | Equivalent homes for a year | — |
Worked example
- Mass1 g
- Energy89,875,517,873,700 J
- Energy24,965,421.63 kWh
- Energy21,480.7643 t TNT
- Equivalent homes for a year7133
Limitations
- The formula assumes ideal conditions: no friction losses, no air resistance and no efficiency losses unless you enter them.
- The default values are typical reference figures, not measurements of your situation. Replace them with your own data whenever you have it.