What is kinetic energy?

Kinetic energy is the energy of motion. KE = ½mv² — it depends on mass and the square of velocity. Doubling speed quadruples kinetic energy, which is why high-speed crashes are so destructive.

What is the unit of kinetic energy?

Joules (J) in the SI system. 1 joule = 1 kg⋅m²/s². For larger amounts, kilojoules (kJ) or watt-hours (Wh) are used.

Kinetic Energy Calculator

Quick answer: Enter mass (kg) and velocity (m/s) to calculate kinetic energy in joules.

Calculate the kinetic energy of a moving object using KE = ½mv². Enter mass in kilograms and velocity in meters per second to get energy in joules, kilojoules, calories, and watt-hours.

Last reviewed: April 2026Report an error

Mass (kg)

Velocity (m/s)

Kinetic Energy

3500.00 J

Kinetic energy: 3500.00 J (3.5000 kJ).

Joules

3500.00

Kilojoules

3.5000

Calories

0.836520

Watt-hours

0.972222

How to Use This Kinetic Energy Calculator

1Enter the mass of the object in kilograms.
2Enter the velocity in meters per second.
3Read kinetic energy in joules, kilojoules, calories, and watt-hours.

Frequently Asked Questions

: Kinetic energy is the energy of motion. KE = ½mv² — it depends on mass and the square of velocity. Doubling speed quadruples kinetic energy, which is why high-speed crashes are so destructive.
: Joules (J) in the SI system. 1 joule = 1 kg⋅m²/s². For larger amounts, kilojoules (kJ) or watt-hours (Wh) are used.

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Kinetic Energy Calculator

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