Enter the duty into the calculator to determine the Voltage from PWM. 

Voltage from PWM Formula

The following formula is used to calculate the Voltage from PWM. 

V = D / 256 * 5


  • Where V is the Voltage from PWM (volts)
  • D is the duty 

How to Calculate Voltage from PWM?

The following two example problems outline how to calculate the Voltage from PWM.

Example Problem #1:

  1. First, determine the duty. In this example, the duty is measured to be 200.
  2. Finally, calculate the Voltage from PWM using the formula above: 

V = D / 256 * 5

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

V = 200 / 256 * 5 = 3.906 (volts)

Example Problem #2: 

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

duty = 21

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

V =21 / 256 * 5 = .410 (volts)