Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Relativity
Rest Mass Energy Calculator
Calculates the intrinsic energy locked in an object's mass using Einstein's famous E = mc². Use it to see how much energy any given mass theoretically contains.
Fill in the required fields to see your result.
Relativity
Relativistic Energy Calculator
Compute the total relativistic energy E = γmc² of a particle from its rest mass and velocity. Reduces to E = mc² at rest and grows without bound as velocity approaches the speed of light.
Fill in the required fields to see your result.
Key differences
| Rest Mass Energy Calculator | Relativistic Energy Calculator | |
|---|---|---|
| Category | Relativity | Relativity |
| Inputs required | 1 | 2 |
| Result | Rest Energy (Joules) | Total Energy (Joules) |
| What it does | Calculates the intrinsic energy locked in an object's mass using Einstein's famous E = mc². Use it to see how much energy any given mass theoretically contains. | Compute the total relativistic energy E = γmc² of a particle from its rest mass and velocity. Reduces to E = mc² at rest and grows without bound as velocity approaches the speed of light. |