Kinetic Energy Calculator
Energy of a moving object, and stopping distance.
Enter 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
- 1KE = ½ × 1500 × 27.8² = 579630 J
Quick answer
Kinetic energy is ½mv², so doubling speed quadruples the energy.
KE = ½mv²
How to use the Kinetic Energy Calculator
- 1Enter the object's mass in kilograms.
- 2Enter its velocity in metres per second.
- 3Add a height to compare potential energy.
Worked example
Using the values the calculator loads with:
Inputs
- Mass1500 kg
- Velocity27.8 m/s
- Height for potential energy10 m
Results
- Kinetic energy579630 J
- In kilojoules579.63
- Potential energy at height147099.75 J
- Equivalent drop height39.4 m
- At double the speed2318520 J
- KE = ½ × 1500 × 27.8² = 579630 J
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
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.