Accurate Calculations
All calculations are performed after converting your values into standard SI units, kilograms, meters per second, and joules.
Free Physics Calculator
Kinetic Energy Calculator
Calculate the kinetic energy of any moving object using its mass and velocity. You can also rearrange the formula to calculate mass or velocity with accurate unit conversions.
- Instant calculation
- Multiple units
- Step-by-step results
Calculator
Calculate Kinetic Energy
Select the value you want to calculate and enter the known values.
Please enter valid positive values.
Calculation Result
Kinetic Energy
Enter the mass and velocity to calculate the object's energy.
Calculated Energy
0
joules
Kilojoules
0 kJ
Scientific Notation
0 × 10⁰
Calculation Steps
- Select what you want to calculate.
- Enter the required values and units.
- Click the calculation button to view the result.
About the Tool
What Is a Kinetic Energy Calculator?
This calculator measures the energy an object has because of its motion. It uses mass and velocity to produce an accurate result in joules.
Automatic Unit Conversion
Enter mass, speed, and energy using commonly used metric or imperial units without performing manual conversions.
Useful for Learning
Students, teachers, engineers, and science enthusiasts can view the formula, substituted values, and calculation steps.
KE = ½mv²
The standard formula for translational kinetic energy
Formula Explained
Kinetic Energy Formula
Kinetic energy depends on the object's mass and the square of its velocity. The standard unit of kinetic energy is the joule.
KE
Kinetic Energy
Measured in joules, written as J.
m
Mass
Measured in kilograms, written as kg.
v
Velocity
Measured in meters per second, written as m/s.
Doubling mass doubles kinetic energy, but doubling velocity increases
kinetic energy by four times because velocity is squared.
Simple Process
How to Use the Kinetic Energy Calculator
Complete the calculation in four simple steps without manually rearranging formulas or converting measurement units.
Select a Calculation
Choose whether you want to calculate kinetic energy, mass, or velocity.
Enter Known Values
Provide the values you already know using positive numbers.
Choose Units
Select the measurement unit used for each value you entered.
View the Result
Calculate and review the final value, conversions, and working steps.
Worked Example
Kinetic Energy Calculation Example
Consider a 1,500-kilogram car traveling at 20 meters per second.
Energy of a Moving Car
The vehicle has a mass of 1,500 kg and a velocity of 20 m/s.
KE = ½ × m × v²
KE = ½ × 1,500 × 20²
KE = 750 × 400
KE = 300,000 J
The car has 300,000 joules, or 300 kilojoules, of kinetic energy.
Energy Comparison
Examples of Kinetic Energy
The following examples show how mass and velocity influence the energy of different moving objects.
| Moving Object | Mass | Velocity | Approximate Kinetic Energy |
|---|---|---|---|
| Tennis ball | 0.058 kg | 30 m/s | 26.1 J |
| Running person | 70 kg | 5 m/s | 875 J |
| Moving bicycle and rider | 90 kg | 10 m/s | 4,500 J |
| Passenger car | 1,500 kg | 20 m/s | 300,000 J |
| Loaded truck | 20,000 kg | 25 m/s | 6,250,000 J |
Common Questions
Kinetic Energy Calculator FAQs
Find clear answers to frequently asked questions about kinetic energy, mass, velocity, formulas, and measurement units.
Kinetic energy is the energy an object possesses because it is moving. An object with greater mass or velocity generally has more kinetic energy.
The formula is KE = ½mv², where m represents mass in kilograms and v represents velocity in meters per second.
The standard SI unit is the joule. One joule equals one kilogram multiplied by one meter squared per second squared.
Kinetic energy is proportional to velocity squared. Doubling an object's velocity increases its kinetic energy by four times.
Translational kinetic energy cannot be negative because mass is positive and velocity is squared. A stationary object has zero kinetic energy.
Rearrange the formula as v = √(2KE ÷ m). Enter the kinetic energy and mass into the calculator after choosing the Find Velocity mode.
Not always. Kinetic energy depends on both mass and velocity. A lighter object traveling much faster can have more kinetic energy than a heavier but slower object.