Standards-compliant calculators for electricians in NZ & Australia. Free, no signup required. Works on mobile.
Each calculator opens on its own page — bookmark the ones you use most.
Size cables by load current and run length. AS/NZS 3000 and BS 7671 compliant.
Solve for voltage, current, resistance or power from any two known values.
Convert wire sizes between mm², AWG and SWG. Quick reference for multi-standard work.
Calculate kVA, kW, current and power factor for three-phase loads.
Check if your panel can handle an EV charger. Panel utilisation, recommended breaker, cable size.
Calculate how many cables fit in a conduit. PVC and steel conduit, TPS and single-core cables.
Motor full load current, recommended breaker, cable size, and overload settings.
Size a generator based on your electrical loads. Supports motor starting surge and demand factor.
Calculate voltage drop for any cable run. Copper and aluminium, single and three phase.
Calculate how much an appliance costs to run. Daily, monthly, and annual costs.
Calculate your electrical business profitability based on jobs, rates, and overhead.