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Free Electrical Calculators
Calculate motor current, apparent power, electricity cost, voltage drop, power-factor compensation and Ohm’s law. Choose a calculator below.
Motor CurrentConvert motor kW or HP to running current.kVA ↔ AmpsConvert kVA to amps, or amps back to kVA.Electricity CostEstimate energy units and cost for multiple loads.Voltage DropCheck voltage drop using copper or datasheet R/X.Power Factor / kVAREstimate kvar needed to improve lagging power factor.Ohm’s LawFind V, A, Ω and W from two known values.
Calculate, understand and keep the result
Each calculator has labelled inputs, an example, the formula and a result summary. Calculate first, then copy the result, download its CSV or use your browser’s Print / Save PDF option. No API key or account is required.
Use equipment data for power factor, efficiency and cable resistance. The electricity-cost tool uses the rate you enter. A calculation result is specific to those assumptions; it does not select protective equipment or certify an installation.
Start with the right electrical quantity
Motor shaft-output kW differs from electrical-input kW. Apparent power in kVA differs from active power in kW. For three-phase current, choose the correct line-to-line or line-to-neutral voltage reference.
For a voltage-drop check on a motor or aluminium cable, use the datasheet R/X option. The simple copper model is a resistance estimate at unity power factor.
