Single Phase Power Calculator


About Single Phase Power Calculator (Formula)

The Single Phase Power Calculator is a tool used to determine the electrical power in a single-phase AC (alternating current) circuit. It helps in calculating the power consumption or power output of electrical devices or systems operating on a single-phase power supply. The calculation of single-phase power involves the following formula:

Power (P) = Voltage (V) × Current (I) × Power Factor (PF)


  • Power (P) represents the electrical power in watts (W).
  • Voltage (V) refers to the voltage supplied to the circuit, typically measured in volts (V).
  • Current (I) denotes the current flowing through the circuit, usually measured in amperes (A).
  • Power Factor (PF) represents the ratio of real power (active power) to apparent power in the circuit, usually expressed as a decimal or percentage.

To calculate the single-phase power, multiply the Voltage by the Current, and then multiply the result by the Power Factor.

For example, if the voltage supplied to a circuit is 220 volts, the current flowing through the circuit is 10 amperes, and the power factor is 0.9, the power would be:

Power = 220 V × 10 A × 0.9 Power = 1980 W

In this case, the single-phase power would be 1980 watts.

The Single Phase Power Calculator is commonly used by electricians, engineers, and individuals working with single-phase electrical systems to assess power consumption, determine appropriate circuit capacity, and evaluate energy efficiency. It aids in proper load management, sizing of electrical equipment, and understanding the power requirements of various devices or appliances.

Please note that the power factor is an important factor to consider, as it indicates the efficiency of power usage in the circuit. A power factor of 1 (or unity) signifies maximum efficiency, while a power factor below 1 indicates power losses due to reactive loads or poor power factor correction.

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