Electrical calculators
Voltage drop, Ohm's law, three-phase power, cable size, power factor, motor energy and transformer load.
Electrical
Voltage Drop Calculator
Voltage drop and end voltage for copper or aluminium cables in DC, single- and three-phase circuits.
Electrical
Ohm's Law Calculator
Solve voltage, current, resistance and power from any two known values.
Electrical
Three Phase Power Calculator
Real (kW), apparent (kVA) and reactive (kVAr) power of a three-phase load.
Electrical
Cable Size Estimator
Minimum standard cable cross-section to keep voltage drop within your limit.
Electrical
kW to Amps Calculator
Convert kilowatts to amps for DC, single-phase and three-phase circuits.
Electrical
Power Factor Calculator
Power factor, reactive power (kVAR) and phase angle from measured real power, voltage and current.
Electrical
Industrial Motor Energy Cost
Annual electricity use and cost of an electric motor from rated power, load, efficiency and running hours.
Electrical
Transformer Load Calculator
Actual transformer loading in kVA and percent of rating from measured voltage and current, plus full-load current.