Enter the torque (N-m), the RPM, and the current (amps) into the calculator to determine the Voltage from RPM. 

Voltage from RPM Formula

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

V = 2*pi / 60 * t * w / I
  • Where V is the Voltage from RPM (volts)
  • t is the torque (N-m) 
  • w is the RPM 
  • I is the current (amps) 

To calculate the voltage from RPM, multiply the torque by the RPM, divide by the current, then multiply by 2 times pi over 60.

How to Calculate Voltage from RPM?

The following example problems outline how to calculate Voltage from RPM.

Example Problem #1

  1. First, determine the torque (N-m). In this example, the torque (N-m) is determined to be 15 .
  2. Next, determine the RPM. For this problem, the RPM is measured to be 4 .
  3. Next, determine the current (amps). In this case, the current (amps) is found to be 50.
  4. Finally, calculate the Voltage from RPM using the formula above: 

V = 2*pi / 60 * t * w / I

Inserting the values from above and solving yields: 

V = 2*3.14159/ 60 * 15 * 4 / 50 = .125 (volts)

Example Problem #2

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

torque (N-m) = 41

RPM = 1

current (amps) = 52

Enter these given values into the calculator or above yields: 

V = 2*3.1415/ 60 * 41 * 1 / 52 = .082 (volts)