Speaker Wire Gauge Calculator
Find the right speaker wire gauge based on speaker impedance, distance, and power.
Avoid signal loss with the correct AWG wire size.
Recommended Wire Gauge
Speaker wire gauge matters because wire has resistance, and too much resistance wastes power and degrades audio quality.
The goal: Keep wire resistance below 5% of speaker impedance (audiophile standard: below 2%).
Max Wire Resistance = Speaker Impedance × 0.05
Required Resistance per Foot = Max Resistance / (2 × Distance)
(Multiply distance by 2 because current flows through both conductors.)
AWG wire resistance (per foot at 20°C):
| AWG | Ω/ft | Ω/m |
|---|---|---|
| 10 | 0.001 | 0.00328 |
| 12 | 0.00159 | 0.00521 |
| 14 | 0.00253 | 0.0083 |
| 16 | 0.00402 | 0.0132 |
| 18 | 0.00639 | 0.021 |
Quick guide (5% loss limit):
| Distance | 4Ω Speaker | 8Ω Speaker |
|---|---|---|
| Under 25 ft | 16 AWG | 18 AWG |
| 25–50 ft | 14 AWG | 16 AWG |
| 50–100 ft | 12 AWG | 14 AWG |
| 100+ ft | 10 AWG | 12 AWG |
Tips:
- Lower gauge number = thicker wire
- 4Ω speakers need thicker wire than 8Ω
- Use banana plugs or spade connectors for best connection
- Oxygen-free copper (OFC) is standard quality — exotic cables rarely improve sound