Enter the total horsepower (hp), the voltage (volts), and the power factor into the calculator to determine the Current From HP. 

Current From HP Formula

The following formula is used to calculate the Current From HP.

I = HP *  746 / (V*PF*n)

  • Where I is the Current From HP (amps)
  • HP is the total horsepower (hp) 
  • V is the voltage (volts) 
  • PF is the power factor 
  • n is the efficiency

To calculate current from horsepower, multiply the HP by 746, then divide by the product of the voltage, power factor, and efficiency.

How to Calculate Current From HP?

The following example problems outline how to calculate Current From HP.

Example Problem #1

  1. First, determine the total horsepower (hp). In this example, the total horsepower (hp) is determined to be 10 .
  2. Next, determine the voltage (volts). For this problem, the voltage (volts) is measured to be 50 .
  3. Next, determine the power factor. In this case, the power factor is found to be 3.
  4. Next, determine the efficiency. For this problem this is .50.
  5. Finally, calculate the Current From HP using the formula above: 

I = HP *  746 / (V*PF*n)

Inserting the values from above and solving yields: 

I = 10* 746 / (50*3*.50) = 99.46 (amps)

Example Problem #2

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

total horsepower (hp) = 50

voltage (volts) = 5

power factor = 10

efficiency = .76

Enter these given values into the calculator or above yields: 

I = 50 *  746 / (5*10*.75) = 994.66 (amps)