Three Phase Calculator
Convert electrical units with this free three phase calculator. Essential for electronics and electrical engineering.

What Three Phase Calculator does
The Three Phase Calculator on Number Convert is a free online tool designed for electronics and electrical engineering tasks. Users input line voltage, current, and power factor to compute apparent power (kVA), active power (kW), and reactive power (kVAR) for three-phase AC circuits. The output provides a comprehensive summary of system performance, making it useful for analyzing and designing industrial power systems. The tool simplifies complex power calculations into a single interface, serving students, engineers, and technicians working with alternating current systems.
How to use the Number Convert Three Phase Calculator
- 1
Enter the line voltage value in volts
- 2
Input the line current value in amperes
- 3
Specify the power factor as a decimal or percentage
- 4
View the calculated results for apparent power (kVA), active power (kW), and reactive power (kVAR)
Best for
Electrical engineering students, electricians, and technicians who need to quickly calculate three-phase power relationships for industrial or commercial system design and analysis.
Limitations
- Results depend on accurate input of voltage, current, and power factor
- Interface includes advertisements that may distract from the calculation fields
- Calculations assume balanced three-phase systems and standard sinusoidal waveforms
Three Phase Calculator FAQ
- How do you calculate three-phase power?
- The calculator uses the formula P = √3 × V_line × I_line × PF, where V_line is line voltage, I_line is line current, and PF is power factor. For example, with 480V, 100A, and PF=0.85, the result is approximately 70.6 kW.
- What is the advantage of three-phase power?
- Three-phase power delivers more efficient power transmission with smaller, less expensive wiring compared to single-phase systems, making it ideal for running large motors and industrial equipment.
- What is the relationship between volts, amps, and watts?
- In three-phase circuits, apparent power (kVA) equals √3 × volts × amps, while active power (kW) equals apparent power multiplied by the power factor, which accounts for the phase difference between voltage and current.
- Are the calculation results precise?
- Results use standard electrical formulas based on internationally agreed SI units maintained by NIST, providing accurate calculations for balanced three-phase systems with the entered parameters.
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