83+ standards-compliant calculators for field service trades. Free, no signup required. Works on mobile.
Certificate of Compliance Generator
Fill out an electrical CoC and download the PDF free. ESR 2010 / AS/NZS 3000:2018 format.
Cable Size Calculator
Size cables by load current and run length. AS/NZS 3000 and BS 7671 compliant.
Ohm's Law Calculator
Solve for voltage, current, resistance or power from any two known values.
Wire Size Converter
Convert wire sizes between mm², AWG and SWG. Quick reference for multi-standard work.
Three-Phase Power Calculator
Calculate kVA, kW, current and power factor for three-phase loads.
EV Charger Load Calculator
Check if your panel can handle an EV charger. Panel utilisation, recommended breaker, cable size.
Conduit Fill Calculator
Calculate how many cables fit in a conduit. PVC and steel conduit, TPS and single-core cables.
Motor FLC Calculator
Motor full load current, recommended breaker, cable size, and overload settings.
Generator Sizing Calculator
Size a generator based on your electrical loads. Supports motor starting surge and demand factor.
Voltage Drop Calculator
Calculate voltage drop for any cable run. Copper and aluminium, single and three phase.
Energy Cost Calculator
Calculate how much an appliance costs to run. Daily, monthly, and annual costs.
Business Profit Calculator
Calculate your electrical business profitability based on jobs, rates, and overhead.
Heat Load Calculator
Calculate heating and cooling loads. Recommends kW AC or heat pump size for any room or zone.
Duct Sizing Calculator
Size round and rectangular HVAC ducts. ASHRAE velocity limits, pressure drop per 100 m.
Refrigerant Charge Calculator
Factory charge and pipe run adjustment for R-32, R-410A and R-134a split systems.