About the Energy Calculator
Calculate kinetic, potential, elastic, thermal or mass energy (E = mc²) — pick the type and enter the values.
Also known as: energy formula, e=mc2 calculator, joules of energy, mechanical energy calculator, mechanical-energy.
How to use this calculator
- Enter energy type and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
KE = ½mv² · PE = mgh · Eₑ = ½kx² · E = Pt · E = mc²
Worked example
Using the values pre-filled in the calculator above:
- Energy type: Kinetic (½mv²)
- Mass = 1,200 kg
- Velocity = 25 m/s
the calculator returns:
- Energy: 375,000 J
- Kilojoules: 375
- Kilowatt-hours: 0.104167
- Calories: 89,627.15