Cable Sizing Calculator

Work out current capacity, derating, voltage drop and a recommended conductor size — single- or three-phase. Built around AS/NZS 3000 and AS/NZS 3008 concepts, in plain trade terms.

Beta — check everything. These calculators are new and may not always be correct. Cross-reference every result against the current standards (AS/NZS 3000, AS/NZS 3008), manufacturer data and your own working before relying on it. In particular, the cable capacities and mV/A/m values built into this tool are rounded placeholder figures for demonstration, not AS/NZS 3008 table values — every result must be confirmed by a licensed person against your actual installation conditions.