Cable Sizing Calculator
Calculate minimum cable size based on load current, installation method, derating factors, and voltage drop requirements.
For reference only — always verify with the current published standard and consult a licensed electrical engineer for critical installations.
Cable Parameters
Load
Cable
Installation
Environment
About This Cable Sizing Calculator
This calculator determines the minimum cable size for a circuit based on load current, installation method, and derating factors. Built for Australian electricians who need a quick reference during design or quoting.
Use it when sizing sub-mains, final sub-circuits, or any cable run where you need to check current capacity and voltage drop together. Enter your load, pick your installation method, and get a result in seconds.
Calculations follow AS/NZS 3008.1.1 current-carrying capacity tables and AS/NZS 3000 voltage drop limits. This is a reference tool only. Always verify results against the current edition of the standard for your specific installation.
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