Kinetic Energy Calculator
Find the kinetic energy of any moving object from its mass and speed.
kg
m/s
- 1
Square the velocity
v² = 10² = 100Kinetic energy grows with the square of speed — doubling speed quadruples energy. - 2
Multiply by mass
m × v² = 2 × 100 = 200 - 3
Kinetic energy (KE = ½ × m × v²)
½ × 200 = 100
Formula
How this is calculated
Two inputs drive the result: mass and velocity. Mass (m) is the amount of matter in the moving object, entered in kilograms (kg). Velocity (v) is its speed, entered in metres per second (m/s); direction does not matter here because energy is a scalar, so only the magnitude of the speed is used.
The calculator squares the velocity, multiplies by the mass, and halves the result: KE = ½ × m × v². Squaring v before multiplying is the crucial step — it means energy depends on the square of speed, not speed itself. The output is in joules (J), the SI unit of energy, and is also shown in kilojoules (÷1,000) and kilocalories (÷4,184) for convenience.
This is classical (Newtonian) kinetic energy, valid for everyday speeds. It assumes the object is rigid and moving in a straight line, and ignores rotational energy, internal heat, and relativistic effects that only become significant near the speed of light. Because of the v² term, doubling the speed quadruples the energy and tripling it multiplies the energy ninefold.
Examples
| Input | Result |
|---|---|
| m = 2 kg, v = 10 m/s | KE = 100 J |
About this calculator
Kinetic energy is the energy an object possesses because of its motion. It is given by KE = ½ × m × v², where m is mass in kilograms and v is velocity in metres per second, yielding energy in joules (J).
Because velocity is squared, kinetic energy grows very quickly with speed: doubling the speed quadruples the energy. This is why high-speed collisions are so much more destructive than slow ones, and why stopping distances increase dramatically as speed rises.
Frequently asked questions
Kinetic energy equals one half of mass times velocity squared: KE = ½mv². Use kilograms and m/s to get joules.
Kinetic energy depends on the square of speed, so doubling the velocity multiplies the energy by four. Speed matters far more than mass for energy.
It expects mass in kilograms and velocity in metres per second, and returns energy in joules, with kilojoule and kilocalorie equivalents.
Also known as
TG we-Calculate Editorial Team. (2026). Kinetic Energy Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/kinetic-energy-calculator
TG we-Calculate Editorial Team. "Kinetic Energy Calculator." TG we-Calculate. 2026. https://we-calculate.com/calculator/kinetic-energy-calculator.
TG we-Calculate Editorial Team, "Kinetic Energy Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/kinetic-energy-calculator
@misc{wecalculate_kinetic_energy_calculator, title = {Kinetic Energy Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/kinetic-energy-calculator}}, year = {2026}, note = {TG we-Calculate} }
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