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Electrical · Free Calculator

Cable Sizing Calculator

Calculate the correct cable size based on current load, cable length, and installation method. Compliant with AS/NZS 3008 Australian wiring standards.

Enter Your Measurements
Amps
metres
V
Results

Enter your measurements to see results

Pro Tips
  • Maximum voltage drop allowed is 5% from the point of supply (AS/NZS 3000)
  • Always derate cable capacity for installation method and ambient temperature
  • Underground cables must be buried minimum 500mm deep in residential areas
  • Use TPS (thermoplastic sheathed) for standard residential wiring
  • All electrical work must be done by a licensed electrician in Australia

"I built these calculators because I was sick of doing the maths on a notepad. Now every tradie can use them for free."

— Jarrod A., Founder & QBCC-Licensed Concreter

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