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Calculation Machine

Kinetic Energy Calculator

Energy of a moving object, and stopping distance.

Reviewed by James Whitfield · How we check our maths

Your values

ⓘ Live results

Results
Kinetic energy
579630 J
In kilojoules
579.63
Potential energy at height
147099.75 J
Equivalent drop height
39.4 m
At double the speed
2318520 J

Working

  1. 1KE = ½ × 1500 × 27.8² = 579630 J

Quick answer

Kinetic energy is ½mv², so doubling speed quadruples the energy.

The formula

KE = ½mv²

Worked example

Worked example

Using the values the calculator loads with.

Inputs

  • Mass1500 kg
  • Velocity27.8 m/s
  • Height for potential energy10 m

Result

  • Kinetic energy579630 J
  • In kilojoules579.63
  • Potential energy at height147099.75 J
  • Equivalent drop height39.4 m
  • At double the speed2318520 J

How to use the Kinetic Energy Calculator

  1. 1Enter the object's mass in kilograms.
  2. 2Enter its velocity in metres per second.
  3. 3Add a height to compare potential energy.

Frequently asked questions

Why does speed matter so much in crashes?

Energy scales with the square of speed — 60 mph carries 44% more energy than 50 mph, not 20%.

How do I convert mph to m/s?

Multiply mph by 0.44704.

About this calculator