Enter the initial kinetic energy (J) and the final kinetic energy (J) into the calculator to determine the Net Kinetic Energy. 

Net Kinetic Energy Formula

The following equation is used to calculate the Net Kinetic Energy. 

Enet = Ef - Ei


  • Where Enet is the Net Kinetic Energy (J)
  • Ei is the initial kinetic energy (J) 
  • Ef is the final kinetic energy (J) 

To calculate the net kinetic energy, subtract the initial energy from the final energy.

How to Calculate Net Kinetic Energy?

The following two example problems outline the steps and information needed in order to calculate the Net Kinetic Energy.

Example Problem #1:

  1. First, determine the initial kinetic energy (J). In this example, the initial kinetic energy (J) is measured to be 100.
  2. Next, determine the final kinetic energy (J). For this problem, the final kinetic energy (J) is calculated to be 200.
  3. Finally, calculate the Net Kinetic Energy using the formula above: 

Enet = Ef – Ei

Inserting the values from above and solving the equation with the imputed values gives: 

Enet = 200 – 100 = 100 (J)

Example Problem #2: 

Using the same process as example problem 1, we first define the needed variables outlined by the formula. In this case, the values are provide as: 

initial kinetic energy (J) = 300

final kinetic energy (J) = 400

Entering these values into the formula or calculator above gives us: 

Enet = 400 – 300 = 100 (J)