What is the kinetic energy formula?

Kinetic energy is KE = ½ × m × v², where m is mass in kilograms and v is speed in metres per second. The result is in joules (J).

How do I find velocity from kinetic energy?

Rearrange the formula to v = √(2 × KE ÷ m). Select Velocity in this tool and it does the square root for you.

Is my data sent anywhere?

No. All calculations happen locally in your browser and nothing is uploaded.

Kinetic Energy Calculator

Solve KE = ½ m v² for energy, mass, or velocity.

Kinetic energy calculator

Kinetic energy is the energy an object has because of its motion: KE = ½ × m × v², measured in joules. This tool rearranges the formula so you can solve for kinetic energy, mass, or velocity.

Because energy scales with the square of speed, doubling the velocity quadruples the kinetic energy. Pick your unknown, enter the values, and get the answer instantly in your browser.