Electrical Engineering Calculators
Electrical calculators for practical engineering and equipment sizing.
Cable Size Calculator
Estimate preliminary copper or aluminium cable size from load current, voltage drop, run length and design margin.
Voltage Drop Calculator
Estimate single-phase or three-phase cable voltage drop from conductor size, current, length and conductor material.
Motor Current Calculator
Calculate approximate single-phase or three-phase motor full-load current from kW or HP, voltage, efficiency and power factor.
Electrical Load Calculator
Calculate demand kW, kVA and current from connected load, demand factor, voltage and power factor.
Transformer Size Calculator
Estimate required transformer kVA from maximum demand kW, power factor and spare-capacity margin.
DG Size Calculator
Estimate preliminary diesel generator kVA from running load, largest motor starting multiplier, generator power factor and safety margin.
APFC kVAR Calculator
Calculate capacitor-bank kvar required to improve power factor from an existing PF to a target PF.
kW to HP / HP to kW Calculator
Convert kilowatts to mechanical horsepower or horsepower to kilowatts using 1 HP = 0.746 kW.
Electrical engineering calculators for practical load estimates
Calculate preliminary cable size, voltage drop, motor current, electrical demand, transformer kVA, DG size, APFC kvar and kW-HP conversion. Inputs such as phase, power factor, efficiency, voltage, length and design margin stay visible so the result can be reviewed.
Electrical calculators are screening and planning tools. Final design must also verify applicable standards, manufacturer data, protection, fault duty, derating, installation conditions and harmonics where relevant.