Kinetic Energy Calculator

Calculate kinetic energy from mass and velocity.

Mass (kg)

Velocity (m/s)

m/s

Results

Kinetic Energy (J)2,00,000

Kinetic Energy (kJ)200

Velocity (km/h)72

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What is Kinetic Energy?

Kinetic energy is the energy an object possesses due to its motion. It depends on both mass and velocity, but velocity has a much larger effect (it's squared in the formula).

Doubling the speed quadruples the kinetic energy — this is why high-speed car accidents are exponentially more dangerous than low-speed ones.

Formula

KE = ½ × m × v²

Where: - KE = Kinetic energy (Joules) - m = Mass (kg) - v = Velocity (m/s)

Example: A 1000 kg car at 72 km/h (20 m/s): KE = ½ × 1000 × 20² = 200,000 J = 200 kJ

How to use this Kinetic Energy Calculator?

1. Enter mass in kg. 2. Enter velocity in m/s. 3. See kinetic energy in Joules and kJ.

Frequently asked questions

Why is velocity squared?

Because it takes increasingly more energy to accelerate at higher speeds. Going from 0 to 50 km/h takes ¼ the energy of going from 0 to 100 km/h.

What is 1 Joule?

1 Joule is the energy to move 1 Newton through 1 meter. Or the kinetic energy of a 2 kg mass moving at 1 m/s.

How is kinetic energy related to braking distance?

Braking distance is proportional to KE, which is proportional to v². Double the speed = 4× the braking distance.

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