Speaker Wire Calculator — Free Online Calculator
Calculate the right speaker wire gauge based on speaker distance, impedance, and acceptable signal loss.
How to Use This Calculator
Enter the distance from amplifier to speaker, select speaker impedance and maximum acceptable signal loss.
The Formula Explained
Speaker wire must keep resistance low enough relative to speaker impedance that signal loss stays within limits. Max wire resistance = Z × (10^(dB/10) - 1). Lower impedance speakers (4Ω) need thicker wire for the same distance.