Ohm's law, three-phase power, electrical load, generator sizing, and energy cost calculators.
Calculate voltage, current, resistance, and power from any two known electrical values using Ohm's Law.
Convert between watts, amps, and volts for single-phase and three-phase electrical circuits.
Calculate three-phase real power, apparent power, reactive power, and line/phase relationships for Wye and Delta configurations.
Calculate total electrical load for a residential panel using NEC Article 220 Standard Calculation method.
Size a backup generator for your home or jobsite by totaling running and starting wattages of all your appliances.
Calculate the electricity cost of running any appliance by the day, month, and year.
Size the circuit breaker, wire gauge, and estimate installation cost for a home Level 2 EV charger.