Enter the battery current (amps) and the battery resistance (ohms) into the calculator to determine the Battery Voltage. 

Battery Voltage Formula

The following formula is used to calculate the Battery Voltage. 

Vb = Ib * Rb


  • Where Vb is the Battery Voltage (volts)
  • Ib is the battery current (amps) 
  • Rb is the battery resistance (ohms) 

How to Calculate Battery Voltage?

The following two example problems outline the steps and information needed in order to calculate the Battery Voltage.

Example Problem #1:

  1. First, determine the battery current (amps). In this example, the battery current (amps) is measured to be 105.
  2. Next, determine the battery resistance (ohms). For this problem, the battery resistance (ohms) is calculated to be 3.
  3. Finally, calculate the Battery Voltage using the formula above: 

Vb = Ib * Rb

Inserting the values from above into the equation yields: 

Vb = 105 * 3 = 315 (volts)

Example Problem #2: 

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

battery current (amps) = 30

battery resistance (ohms) = 3

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

Vb = 30* 3 = 90 (volts)