Electrical Calculators

Wire size, voltage drop, breakers and power conversions.

AWG · kcmilWire Size CalculatorAWG size from amps and distance, per NEC 310.16.V · %Voltage Drop CalculatorVolts and % lost over a run, with max length at 3%.W · A · VWatts, Amps & Volts CalculatorWatts ↔ amps ↔ volts for DC, 1φ and 3φ.ABreaker Size CalculatorStandard breaker and wire for a load, with the 125% rule.mm²Cable Size Calculator (mm²)Metric cable size in mm² with IEC current ratings.V · A · Ω · WOhm's Law CalculatorSolve V, I, R and P from any two values.in · %Conduit Fill CalculatorSmallest EMT or PVC for your THHN wires.WGenerator Size CalculatorRunning and starting watts for home backup.h · $EV Charging Time & Cost CalculatorCharge time, cost and miles added.kWh · $Electricity Cost CalculatorCost per day, month and year for any device.kVA · ATransformer Size Calculator (kVA)kVA rating and full-load amps, 1φ or 3φ.