Electrical & Power Calculators

Essential tools for electrical engineers, technicians, and DIY enthusiasts. This collection helps with common calculations for circuit design, cable sizing, and power systems analysis, with guidance based on common standards like NEC and AS/NZS.

Electrical Safety Warning

These calculators are for educational and estimation purposes only. Electrical work is dangerous. Always consult a licensed electrician and adhere strictly to your local electrical codes and standards. Incorrect calculations or installations can result in fire, equipment damage, or fatal injury.

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Cable Size Calculator (Australia)

Determine the required electrical cable size based on load, voltage drop, and installation conditions per AS/NZS standards.

Maximum Demand Calculator

Estimate the maximum electrical demand for a building or installation by applying diversity factors to various loads.

Box Fill Calculator

Calculate the required volume for an electrical box based on the number and size of conductors, devices, and clamps, following NEC guidelines.

Current Carrying Capacity Calculator

Estimate the ampacity (current carrying capacity) of a conductor based on its size, insulation, and installation environment.

3 Phase Motor Cable Size Calculator

A specialized tool to determine the correct cable size for a three-phase motor, considering its power, voltage, and run length.

Capacitor Bank Calculation

Calculate the required kVAR for a capacitor bank to improve the power factor of your electrical system.