Enter the measured three-phase power and the input power at full-rated load into the calculator to determine the motor load percentage.

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## Motor Load Formula

The following formula is used to calculate the motor load of an electric motor.

L = Pm / Pi *100

- Where L is the motor load (%)
- Pm is the measured three-phase power (kW)
- Pi is the Input Power at full-rated load (kW)

To calculate the motor load, divide the three-phase power by the input power, then multiply by 100.

## Motor Load Definition

A motor load is defined as the ratio of the measured power to the full rated power that a motor is running at. This ratio can be expressed in percentage by multiplying it by 100 as seen in the formula above.

## Motor Load Example Problem

How to calculate motor load?

**First, determine the measured three-phase power.**For this example, the measured power is found to be 500 kW using the current and amps.

**Next, determine the full-rated load.**This is most often published data by the manufacturer of the motor. For this problem, the rated load is 1000 kW.

**Finally, calculate the motor load.**The motor load can be calculated using the formula above. ML = Pm/PI *100 = 500/1000 *100 = 50%.

## FAQ

**What is motor load? **

A motor load is a percentage of the full rated power that a motor is currently running at. The full rated power is the maximum power the motor can run at.

**Can the motor load be greater than 100%? **

Motors can and do run at greater than 100%, or more than their maximum rated power. In most cases, this will cause damage to the motor, but it does not mean it cannot run at higher rates temporarily.

**What happens when motor load increases? **

An increase in motor load will cause a motor to run at a higher power, and likely a higher heat as more energy is going into the motor.