Motor Power Calculation Calculator & DC, 1 Phase & 3 Phase Power Fromula

Motor Power Calculator:

Enter the current, voltage and power factor for Calculating DC and AC power. Power factor does not require for DC power calculation. Finally, press the calculate button.


mW

W

kW

Motor power calculation with different units:

Motor power has five units based on the quantity and they are µW, mW, W, kW and MW.

Here µW, mW is used to indicate the very smaller size motor up to 1Watts such as stepper motor, reluctance motor etc.

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W is the unit is used for indicating small size motor up to 1000W such as domestic application such as hand drill, light lamps, air blower etc

kW is used for indicating medium-size motor up to 1000kW. Example: pumps, air blower, drier etc.

MW is used for extra larger size motor up to 1000MW. Example oil sucking pump, boiler feed watering pump. Crusher motor etc.

However, W and kW are the units are widely used for indicating the motor power.

Here, we are going to calculate the power for three types of the motor based on the input supply such as DC, Single-phase and three-phase.

DC Motor Power calculation:

DC Motor Power input power P(kW) in kilowatt is equal to the product of the DC armature current I(A) in Amps and DC armature voltage V(V) is divided by 1000. Hence DC motor power calculation in kW,

P(kW) = V(V) x I(A) /1000 in kilowatt.

For Watt calculation formula:

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P(W) = V(V) x I(A) in watt.

For DC motor megawatt power calculation:

P(MW) = V(V) x I(A) /100000 in megawatt.

For Calculating DC motor output power, we need to multiple above formulae with motor efficiency.

DC motor output power = Motor input power x eff

Note: The voltage V(V) to be measured between the armature terminals and DC current I(A) will be the armature current.

AC single phase motor power calculation:

AC single-phase power input P(kW) in kilowatts is equal to the product of the power factor times of the current I(A) and voltage V(V) divided by 1000. Hence single-phase power formula can be written as,

AC single phase power in kilowatt

 P(kW) = V(V) x I(A) x pf / 1000

AC single-phase power in watt

P(W) = V(V) x I(A) x pf.

AC single-phase power in Megawatt,

P(MW) = V(V) x I(A) x pf / 1000000

For Calculating Ac single motor’s output power, the power which is calculated from one of the above formulae to be multiplied by motor efficiency. Here the motor efficiency can be found at the nameplate details

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AC single motor output power = Motor input power x eff

AC Three-phase motor power calculation:

Three-phase power can be calculated by two formulae one is using line to line voltage and line to phase voltage.

Note: The single-phase voltage V(V) in volts has to measure between phase to the neutral terminal.

Using Line to line voltage:

AC three-phase motor power in kilowatt P(kW) is equal to 1.732 times of the product of line to line voltage and current I(A) in amps divided by 1000.

P(kW) = 1.732 x V(V) x I(A) / 1000 kW

P(MW) = 1.732 x V(V) x I(A) / 1000000 MW

P(W) = 1.732 x V(V) x I(A) Watts

Note: The voltage V(V) in volts has to be measured between the line to line voltage.

Using Line to neutral voltage:

P(kW) is equal to 3 times of the product of line to neutral voltage and current I(A) in amps divided by 1000.

P(kW) = 3 x V(V) x I(A) / 1000 kW

P(MW) = 3 x V(V) x I(A) / 1000000 MW

P(W) = 3 x V(V) x I(A) Watts

Note: The voltage V(V) in volts has to be measured between the line to neutral voltage.

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Here three-phase motor output power is equal to the efficiency times of the input power which is calculated by above formulae.

AC 3 phase motor output power = Motor input power x eff

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