Kinetic Energy Calculator
Energy of a moving object, and stopping distance.
Enter your values
Enter the mass in kg.
Enter the velocity in m/s.
Enter the height for potential energy in m.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- 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
At a glance
| What it does | Energy of a moving object, and stopping distance. |
|---|---|
| Category | Physics |
| Inputs needed | Mass, Velocity, Height for potential energy |
| Main output | Kinetic energy |
| Formula | KE = ½mv² |
| Cost | Free — no sign-up, no download |
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.
Inputs explained
- Mass(kg)
- Enter the mass in kg.
- Velocity(m/s)
- Enter the velocity in m/s.
- Height for potential energy(m)
- Enter the height for potential energy in m.
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.
What do I need to enter into the Kinetic Energy Calculator?
Just 3 values: mass, velocity, height for potential energy. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Kinetic Energy Calculator work out the answer?
Kinetic energy is ½mv², so doubling speed quadruples the energy. It applies the formula KE = ½mv² and shows the working so you can check each step by hand.
Is the Kinetic Energy Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.