Electrical engineering calculators

Ohm's Law & Power CalculatorFree Ohm's law and AC power calculator: volts, amps, ohms, watts, kW, kVA, kVAR and power factor for DC, single-phase and three-phase loads.Voltage Drop CalculatorFree voltage drop calculator for copper and aluminium cables in mm² (IEC 60228) or AWG/kcmil (NEC): volts, % drop, 3%/5% limit check and smallest size.Cable Size CalculatorFree cable size calculator: smallest copper or aluminium cable (mm² or AWG) for voltage drop and short-circuit withstand, plus the rating it needs.