Kinetic Energy Calculator
Find the kinetic energy and momentum of a moving object.
Kinetic energy (J)
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Momentum (kg·m/s)
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Mass (kg)
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Velocity (m/s)
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Results update as you type.
About this calculator
Kinetic energy is the energy of motion, KE = ½ × m × v², measured in joules. This calculator also returns the linear momentum p = m × v. Because energy depends on the square of speed, doubling velocity quadruples the kinetic energy.
Frequently asked questions
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. A 2 kg object at 3 m/s has ½ × 2 × 9 = 9 joules.
Why does speed matter more than mass?
Kinetic energy scales with the square of velocity but only linearly with mass, so doubling speed multiplies energy by four while doubling mass only doubles it.
Results are estimates for general guidance only, not financial, medical or tax advice.