Kinetic Energy Calculator
Calculate kinetic energy from mass and velocity using KE equals one half times mass times velocity squared, in joules.
Last reviewed by the Radiatus Cloud team
Calculate kinetic energy from mass and velocity.
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Calculate kinetic energy
Kinetic energy is the energy an object possesses because of its motion. It is calculated as one half of the mass multiplied by the square of the velocity, giving a result in joules when mass is in kilograms and velocity in metres per second. A two-kilogram object moving at ten metres per second has a kinetic energy of one hundred joules. Because velocity is squared, kinetic energy rises very quickly with speed: doubling the speed quadruples the energy.
This squared relationship explains why high-speed impacts are so much more destructive than slow ones.
Energy of motion
Kinetic energy is a cornerstone of mechanics, appearing in collisions, braking distances, roller coasters and countless other contexts. It connects to work through the work-energy theorem, which states that the work done on an object equals its change in kinetic energy. Understanding it helps explain why stopping distances grow sharply with speed and why energy must be managed carefully in moving systems.
Keep units consistent, kilograms and metres per second, for a result in joules. The strong dependence on velocity is the key insight the calculator highlights. All calculation happens locally in your browser.
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Frequently Asked Questions
What is the kinetic energy formula?
Kinetic energy equals one half times mass times velocity squared, giving joules when mass is in kilograms and velocity in metres per second.
Why does doubling speed quadruple the energy?
Because velocity is squared in the formula, so multiplying the speed by two multiplies the kinetic energy by four.
What units should I use?
Use kilograms for mass and metres per second for velocity to get kinetic energy in joules, the standard SI unit of energy.
How is kinetic energy related to work?
The work-energy theorem states that the net work done on an object equals its change in kinetic energy.
Why do high-speed crashes cause more damage?
Because kinetic energy grows with the square of speed, a small increase in speed greatly increases the energy released in an impact.
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How to Use
Enter mass in kilograms and velocity in metres per second.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.