Enter the final elastic potential energy (J), the spring constant (N/m), and the change in position (m) into the calculator to determine the Initial Elastic Potential Energy.

- All Energy Calculators
- Elastic Potential Energy Calculator
- Potential Energy to Force Calculator
- Torsion Bar Spring Energy Calculator

## Initial Elastic Potential Energy Formula

The following equation is used to calculate the Initial Elastic Potential Energy.

**PEi = PEf – f*x**

- Where PEi is the Initial Elastic Potential Energy (J)
- PEf is the final elastic potential energy (J)
- f is the spring constant (N/m)
- x is the change in position (m)

## How to Calculate Initial Elastic Potential Energy?

The following example problems outline the steps and information needed to calculate the Initial Elastic Potential Energy.

**Example Problem #1**

- First, determine the final elastic potential energy (J). In this example, the final elastic potential energy (J) is determined to be 400 .
- Next, determine the spring constant (N/m). For this problem, the spring constant (N/m) is measured to be 3 .
- Next, determine the change in position (m). In this case, the change in position (m) is found to be 5.
- Finally, calculate the Initial Elastic Potential Energy using the formula above:

PEi = PEf – f*x

Inserting the values from above and solving the equation yields:

PEi = 400- 3*5** **= 375** **(J)

**Example Problem #2**

Using the same method as above, first, we need to measure or determine the variables required by the equation. For this example problem, these are provided as follows:

final elastic potential energy (J) = 500

spring constant (N/m) = 4

change in position (m) = 3

Enter these given values into the calculator or above yields:

PEi = 500- 4*3 = 488** **(J)