Enter the source voltage (volts), the number of primary windings, and the number of secondary windings into the calculator to determine the Transformer Voltage. 

Transformer Voltage Formula

The following formula is used to calculate the Transformer Voltage.

Vt = Vs * (P/S)
  • Where Vt is the Transformer Voltage (volts)
  • Vs is the source voltage (volts) 
  • P is the number of primary windings 
  • S is the number of secondary windings 

To calculate the transformer voltage, multiply the source voltage by the ratio of primary windings to secondary windings.

How to Calculate Transformer Voltage?

The following example problems outline how to calculate the Transformer Voltage.

Example Problem #1

  1. First, determine the source voltage (volts). In this example, the source voltage (volts) is determined to be 60 .
  2. Next, determine the number of primary windings. For this problem, the number of primary windings is measured to be 10 .
  3. Next, determine the number of secondary windings. In this case, the number of secondary windings is found to be 5.
  4. Finally, calculate the Transformer Voltage using the formula above: 

Vt = Vs * (P/S)

Inserting the values from above into the equation gives: 

Vt = 60 * (10/5) = 120 (volts)

Example Problem #2

Using the same method as above, determine the variables required by the equation. For this example problem, these are provided as follows: 

source voltage (volts) = 100

number of primary windings = 20

number of secondary windings = 2

Entering these given values into the calculator above yields:

Vt = 100 * (20/2) = 1000 (volts)