Sparky Tools
Your Digital Toolbox
Free AS/NZS electrical calculators and tools built for Australian electricians. Cable sizing, voltage drop, max demand, and more — right in your browser.
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AS/NZS Calculators
Standards-based electrical calculators
Cable Sizing
Calculate cable size based on load, length, and installation method
Voltage Drop
Check voltage drop percentage for cable runs
Max Demand
Calculate maximum demand using AS/NZS 3000 diversity
Conduit Fill
Determine minimum conduit size for cable groups
Cable Derating
Calculate derating factors for grouped cables
RCD Requirements
Check RCD requirements by circuit and location
Earth Fault Loop
Verify fault loop impedance and protection device trip times
Workflow Tools
Tools for the job