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Kinetic Energy Calculator

Calculate the kinetic energy of a moving mass, and how it scales with the square of velocity.

About Kinetic Energy Calculator

Kinetic energy rises with the square of speed, so doubling velocity quadruples the energy that must be dissipated to stop. That relationship is why impact severity climbs so steeply with speed. Braking distance and crash energy both scale with v², which is the single most important fact behind speed limits.

Formula

Kinetic Energy

KE = ½ m v²

m
Mass in kilograms
v
Speed in metres per second

Worked example

With the default values below, Kinetic Energy Calculator returns Kinetic Energy of 375,000.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Massminimum 0 kg
1,200 kg
Velocityminimum 0 m/s
25 m/s

Results

Kinetic Energy
375,000.00 J
Kinetic Energy
375.000 kJ
Velocity
90.00 km/h
Energy if Speed Doubled
1,500,000.00 J
Work Needed to Stop It
375,000.00 J

Step by step

  1. 1Values used
  2. 2Kinetic Energy
  3. 3Kinetic Energy= 375,000.00 J
  4. 4Kinetic Energy= 375.000 kJ
  5. 5Velocity= 90.00 km/h
  6. 6Energy if Speed Doubled= 1,500,000.00 J
  7. 7Work Needed to Stop It= 375,000.00 J

Assumptions and limits

  • The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Kinetic Energy calculated?

KE = ½ m v² Kinetic energy rises with the square of speed, so doubling velocity quadruples the energy that must be dissipated to stop. That relationship is why impact severity climbs so steeply with speed.

Why does Kinetic Energy matter?

Braking distance and crash energy both scale with v², which is the single most important fact behind speed limits.

What values do I need to enter?

This calculator takes 2 inputs: Mass, Velocity. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

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