Enter the power (kW), the voltage (volts), the efficiency factor, and the power factor into the calculator to determine the Motor Current.

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## Motor Current Formula

The following formula is used to calculate the Motor Current.

Im = 1000 * P / [ SQRT(3) * V * EF *PF ]

- Where Im is the Motor Current (amps)
- P is the power (kW)
- V is the voltage (volts)
- EF is the efficiency factor
- PF is the power factor

To calculate a motor current, multiply the power by 1000, then divide by the product of 1.732, the voltage, efficiency factor, and power factor.

## How to Calculate Motor Current?

The following example problems outline how to calculate Motor Current.

**Example Problem #1**

- First, determine the power (kW). In this example, the power (kW) is determined to be 67 .
- Next, determine the voltage (volts). For this problem, the voltage (volts) is measured to be 20 .
- Next, determine the efficiency factor. In this case, the efficiency factor is found to be 5.
- Next, determine the power factor. This is .85.
- Finally, calculate the Motor Current using the formula above:

Im = 1000 * P / [ SQRT(3) * V * EF *PF ]

Inserting the values from above and solving yields:

Im = 1000 * 67 / [ SQRT(3) * 20* 5 *.85 ] = 455.08 (amps)

**Example Problem #2**

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

power (kW) = 60

voltage (volts) = 4

efficiency factor = 2

power factor = .85

Enter these given values into the calculator or above yields:

Im = 1000 * P / [ SQRT(3) * V * EF *PF ] =5094.26** **(amps)