What is the Wire Size Calculator?
Undersized wires overheat and waste power. Enter the load (amps or watts), supply voltage, one-way cable length and the maximum voltage drop you accept (3% is common for lighting and sockets, 5% for long runs). The tool checks standard cable sizes for both current-carrying capacity and voltage drop, and suggests the minimum safe size.
How to use the Wire Size Calculator
- Enter load, voltage, phase and cable length.
- Choose copper or aluminium and allowed drop.
- Use the suggested size (or larger). Always follow local electrical codes.
Safety
This is a guide for estimation. Installation should be done by a qualified electrician following local wiring regulations.
This Wire Size Calculator is 100% free, needs no signup and runs privately in your browser – on phone, tablet or computer.
Last updated: · By NodifyTech