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Kinetic Energy Calculator (KE = ½mv²)

Calculate kinetic energy from mass and velocity – or find mass or speed from energy – using KE = ½mv². Unit options for kg, g, m/s, km/h and J, kJ.

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What is the Kinetic Energy Calculator?

Kinetic energy is the energy an object has because it is moving: KE = ½ × m × v². Double the mass and the energy doubles; double the speed and the energy becomes four times bigger – which is why speeding cars are so dangerous. Solve for energy, mass or velocity.

How to use the Kinetic Energy Calculator

  1. Choose the unknown.
  2. Enter the other two values (mass in kg, speed in m/s – or convert with the helper).
  3. Read the answer with working.

Quick conversions

1 km/h = 0.2778 m/s · 1 kJ = 1000 J · 1 g = 0.001 kg.

This Kinetic Energy Calculator is 100% free, needs no signup and runs privately in your browser – on phone, tablet or computer.

Last updated: · By NodifyTech