Kinetic Energy Calculator
Fill in the values and the answer updates as you type.
How the Kinetic Energy Calculator works
Kinetic energy = ½ × m × v². Momentum = m × v.
Inputs and results
The Kinetic Energy Calculator takes 2 inputs and gives 2 results.
What you enter
- Mass (kg) — starts at 70.
- Speed (m/s) — starts at 10.
What you get
- Kinetic energy (J)
- Momentum (kg·m/s)
Example: Kinetic Energy Calculator with the starting values
With mass 70 kg and speed 10 m/s, the calculator returns:
| Kinetic energy (J) | 3,500 |
|---|---|
| Momentum (kg·m/s) | 700 |
Change any value above and the results update straight away.
Kinetic Energy Calculator FAQ
How do I use the Kinetic Energy Calculator?
Enter mass and speed in the fields, then read kinetic energy (j) and momentum (kg·m/s) in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Kinetic Energy Calculator calculate?
Energy and momentum of a moving object. It returns kinetic energy (j) and momentum (kg·m/s) from the 2 values you provide.
What values does the Kinetic Energy Calculator start with?
It opens with mass 70 kg and speed 10 m/s so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Kinetic Energy Calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Kinetic Energy Calculator for important decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm important decisions with a qualified professional. See the Disclaimer for more.