Electrical Engineering calculators & tools
Run fast preliminary calculations for three-phase current, transformers, voltage drop, motors, generators, batteries, power factor and other common electrical-engineering checks.
Three-Phase Current Calculator
Convert three-phase kW, voltage, power factor and efficiency into line current.
Open tool →Electrical EngineeringVoltage Drop Calculator
Estimate conductor voltage drop using current, length, conductor size and material.
Open tool →Electrical EngineeringTransformer Current Calculator
Convert transformer kVA and voltage into primary and secondary full-load current.
Open tool →Electrical EngineeringTransformer Short-Circuit Current Calculator
Estimate transformer secondary bolted fault current from kVA, voltage and percent impedance.
Open tool →Electrical EngineeringPower Factor Correction Calculator
Estimate capacitor kVAR required to improve power factor at a given kW load.
Open tool →Electrical EngineeringkW, kVA & Amps Calculator
Convert kW into kVA and current for single-phase or three-phase AC systems.
Open tool →Electrical EngineeringMotor Current Calculator
Estimate AC motor line current from horsepower, voltage, efficiency, power factor and phase.
Open tool →Electrical EngineeringGenerator Current Calculator
Convert generator kVA and voltage into approximate full-load current for single- or three-phase systems.
Open tool →Electrical EngineeringOhm's Law Calculator
Calculate current and power from voltage and resistance using Ohm's law.
Open tool →Electrical EngineeringCapacitor kVAR Calculator
Estimate per-phase capacitance from kVAR, voltage, frequency and wye or delta connection.
Open tool →Electrical EngineeringDC Voltage Drop Calculator
Estimate two-wire DC voltage drop from current, one-way length and conductor resistance.
Open tool →Electrical EngineeringBattery Runtime Calculator
Estimate battery runtime from voltage, amp-hours, load, usable depth and conversion efficiency.
Open tool →About these electrical engineering tools
These tools are intended for engineering estimates and sanity checks. Final design must follow applicable codes, standards, manufacturer data, conductor temperature assumptions, protection requirements and project-specific conditions.
Every utility includes an interactive result plus an explanation, example, common questions and links to closely related calculators.