Power factor calculator. Calaculate power factor, apparent power, reactive power and correction capacitor's capacitance.

- Select phase number.
- Enter real power in kilowatts (kW).
- Enter phase current in amps (A).
- For three phase, select voltage type.
- Enter voltage in volts (V).
- Enter AC frequency in Hertz (Hz) - needed only for capacitance calculation.
- Press the calculate button to get the power factor.

The power factor correction capacitor should be connected in parallel to each phase load.

### Single phase circuit calculation

Power factor calculation:

*PF* = |cos *φ|* = 1000 ×
*P*_{(kW)} / (*V*_{(V)} ×
*I*_{(A)})

Obvious power calculation:

*|S*_{(kVA)}| = *V*_{(V)} × *I*_{(A)} / 1000

Reactive power calculation:

*Q*_{(kVAR)} = √(*|S*_{(kVA)}|^{2} - * P*

_{(kW)}

^{2})

Power factor correction capacitor's capacitance calculation:

*C*_{(F)} = 1000 × *Q*_{(kVAR)} / (2π*f*_{(Hz)}×*V*_{(V)}^{2})

### Three phase circuit calculation

For three phase with balanced loads:

#### Calculation with line to line voltage

Power factor calculation:

*PF* = |cos* φ|* = 1000 × *P*_{(kW)} / (* √*3 ×

*V*

_{L-L(V)}×

*I*

_{(A)})

Obvious power calculation:

*|S*_{(kVA)}| = * √*3 ×

*V*

_{L-L(V)}×

*I*

_{(A)}/ 1000

Reactive power calculation:

*Q*_{(kVAR)} = √(*|S*_{(kVA)}|^{2} - * P*

_{(kW)}

^{2})

Power factor correction capacitor's capacitance calculation:

*C*_{(F)} = 1000 × *Q*_{(kVAR)} / (2π*f*_{(Hz)}×*V*_{L-L(V)}^{2})

#### Calculation with line to neutral voltage

Power factor calculation:

*PF* = |cos* φ|* = 1000 × *P*_{(kW)} / (3 × *V*_{L-N(V)} × *I*_{(A)})

Obvious power calculation:

*|S*_{(kVA)}| = 3 × *V*_{L-N(V)} × *I*_{(A)} / 1000

Reactive power calculation:

*Q*_{(kVAR)} = √(*|S*_{(kVA)}|^{2} - * P*

_{(kW)}

^{2})

Power factor correction capacitor's capacitance calculation:

*C*_{(F)} = 1000 × *Q*_{(kVAR)} / (3×2π*f*_{(Hz)}×*V*_{L-N(V)}^{2})

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