Physics Formulas: Motion, Force and Energy Explained
The core mechanics formulas every student needs — velocity, acceleration, the equations of motion, force, momentum, work, energy and power — explained plainly with worked examples.
Kinetic Energy Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Kinetic energy
125.000
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Kinetic Energy Calculator
The Kinetic Energy Calculator works out your kinetic energy in an instant. Enter mass and velocity and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the mass.
- Enter the velocity.
- Read off your kinetic energy — the calculator updates automatically, with no button to press.
Formula
The Kinetic Energy Calculator uses the formula:
Kinetic energy = 0.5 × Mass × Velocity ^ 2
Worked example
For example, with mass of 10 kg and velocity of 5 m/s, the kinetic energy is 125.000.
| Mass | 10 kg |
|---|---|
| Velocity | 5 m/s |
| Kinetic energy | 125.000 |
|---|
Results are estimates for educational use, not professional advice.
Key terms explained
- Velocity
- The speed of an object in a given direction.
- Kinetic energy
- The energy an object has because of its motion, equal to ½ × mass × velocity².
Frequently asked questions
Kinetic energy is one half times mass times velocity squared: KE = ½ m v². A 10 kg object moving at 5 m/s has 125 joules of kinetic energy.
Because energy rises with the square of speed, doubling the velocity gives four times the kinetic energy. Speed matters far more than mass.
Mass in kilograms and velocity in metres per second give energy in joules, the SI unit of energy.
Momentum is mass times velocity and is a vector. Kinetic energy is a scalar using velocity squared, so it is always positive.
Enter the mass. Enter the velocity. Read off your kinetic energy — the calculator updates automatically, with no button to press.
Related guides
Kinetic Energy Table: Kinetic energy by Mass
Reference table of kinetic energy for Kinetic Energy across a range of mass values — exact, engine-computed figures you can read off at a glance.
How to Calculate Kinetic Energy: Formula, Steps & Examples
Learn how to calculate Kinetic Energy — the formula explained step by step, with worked examples and a free calculator to check your answer.