Power Conversion Calculator

Software Version:

Convert between amps, kVA and kW. Single phase and three phase.

Power Triangle

Definitions

• Current (A): The flow of electric charge in a circuit, measured in amperes (A).
• Apparent power (kVA): Total power used by a system, including both active and reactive power, measured in kilovolt-amperes (kVA).
• Active power (kW): Actual power consumed by electrical equipment to perform useful work, measured in kilowatts (kW).
• Reactive power (kVAR): Power used to maintain the electric and magnetic fields in inductive and capacitive components, measured in kilovolt-amperes reactive (kVAR).
• Voltage, phase to earth (V): The voltage measured between a phase conductor and the earth (ground), typically in volts (V).
• Number of phases: The number of alternating current (AC) waveforms in a system. Commonly, systems have single-phase or three-phase configurations.
• Power factor: The ratio of active power (kW) to apparent power (kVA) in a circuit. It indicates the efficiency with which electrical power is converted into useful work.
• Power: The rate at which electrical energy is transferred by an electric circuit, typically measured in watts (W).
• Maximum demand: The highest level of electrical power demand recorded over a specific period, usually measured in kilowatts (kW) or kilovolt-amperes (kVA). It is a critical parameter used to ensure that the electrical system can handle peak loads safely and efficiently, preventing overloads and ensuring reliable operation.

Information

How to use the calculator

1. Input the phase to earth voltage, number of phases and power factor.
2. Input the current. This will calculate the power in kVA and kW.
3. Alternatively, input the power in kVA. This will calculate the current and power in kW.
4. Alternatively, input the power in kW. This will calculate the current and power in kVA.

Equations

• Amps = (kVA * 1000) / (Voltage * #_Phases)
• kVA = (Voltage * Amps * #_Phases) / 1000
• kVA = kW / Power_Factor
• kW = kVA * Power_Factor
• Rounded to 3 decimal places

More information

Australian Standard 60038 - Standard Voltages (2022)

• Nominal voltage for three-phase four-wire or three-wire systems at a nominal frequency of 50HZ is 230/400V.
• Nominal voltage for single-phase two-wire systems at a nominal frequency of 50HZ is 230V.
• "Concerning supply voltage range in Australia, under normal operating conditions, the supply voltage should not differ from the nominal voltage of the system by more than +10%, -6%."
• Refer to Australian Standards documentation for the latest information.