Physics

Convert AC amps and volts to kVA for single-phase or balanced three-phase systems using the matching voltage reference.

Convert kVA to amps for single-phase and three-phase circuits with the correct voltage basis.

Convert watts, VA, and power factor for UPS, generator, inverter, or transformer sizing with optional extra room.

Convert volt-amperes to watts with a power factor, and optionally check the result against a UPS listed watt limit.

Size a transformer from kW and power factor or from volts and amps, with loading limit, growth, standard size, and full-load amps.

Calculate NEC-style electrical box fill by AWG, grounds, devices, clamps, and box volume, with pass or short result.

Check conduit fill, NEC fill percent, room left, and the smallest supported conduit size for mixed conductor rows.

Find or check NEC-style wire ampacity using load amps, material, terminal rating, ambient heat, and conductor count.

Estimate extension cord voltage drop, load-end voltage, heat loss, and a voltage-drop-only AWG suggestion.

Estimate EV miles to your chosen reserve using battery size, charge, efficiency, battery health, conditions, and trip distance.