Energy Calculator
Kinetic and potential energy, and work done.
kg
m/s
Energy
250J
In kilojoules
0.25kJ
In calories
59.7514cal
In watt-hours
0.069444Wh
ShowHide the working
- 1E = ½ × 5 × 10² = 250 J
Formula
KE = ½mv² · PE = mgh · W = FdHow it works
Kinetic energy, gravitational potential energy and mechanical work, all in joules (g = 9.81 m/s²).
Example
A 5 kg mass at 10 m/s has 250 J of kinetic energy.
About the Energy Calculator
Kinetic and potential energy, and work done. It sits in the Physics & Engineering section of NWS Calc, a free collection of calculators that run entirely in your browser. There is no signup, no paywall and no tracking — open the page, enter your numbers, get an answer.
Frequently asked questions
- Is the Energy Calculator free to use?
- Yes. Every calculator on NWS Calc is completely free, with no signup, no usage limits and no ads.
- Does my data leave my device?
- No. The Energy Calculator runs entirely in your browser using JavaScript. Nothing you type is uploaded, logged or stored on a server.
- Can I use the Energy Calculator on my phone?
- Yes. The page is fully responsive and works in any modern mobile or desktop browser — there is nothing to install.
- What else is in Physics & Engineering?
- Motion, force, energy, electricity and wave calculations. You can browse the full Physics & Engineering category for related calculators.