PowerCalc

PowerCalc performs basic electrical power calculations with watts, volts, amps, and motor power factor. It works in three modes:

DC mode - simple watts, volts, amps calculations. Set the voltage, then enter a wattage to determine the electrical current drawn in amps. Or enter the rated ampacity of a device and see maximum wattage load.

AC Resistive mode - (incandescent lighting, heaters) - same as above, plus the ability to choose 1, 2, or 3 phase power service and calculate load distribution across phases.

AC Inductive mode - (motors and fluorescent lighting) - adds power factor, and calculates inductive loading. Choose single phase or three phase power.

Works for any voltage, in any country.

(Note that some reviews refer to version 1.0, which did not support the inductive power calculations included in this version.)