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Automotive Wire Amperage Capacity Chart

  Recommended Length and Amperage for Automotive Wire while maintaining a 2% or less voltage drop at 12 volts
Automotive Wire Size 5 Amps 10 Amps 15 Amps 20 Amps 25 Amps 30 Amps
20 Gauge Wire (AWG)  4.5 ft 2.2 ft 1.6 ft   .  
18 Gauge Wire (AWG)  7.3 ft 3.7 ft 2.4 ft 1.8 ft  
16 Gauge Wire (AWG)  11.5 ft  5.8 ft  3.8 ft 2.9 ft  2.3 ft  1.9 ft
14 Gauge Wire (AWG)  18.4 ft  9.2 ft  6.1 ft 4.6 ft  3.7 ft  3.1 ft
12 Gauge Wire (AWG)  29.4 ft  14.7 ft  9.8 ft 7.4 ft  5.9 ft  4.9 ft
10 Gauge Wire (AWG) 46.8 ft  23.4 ft  15.6 ft 11.7 ft  9.4 ft 7.8 ft
8 Gauge Wire (AWG)  74.4 ft  37.2 ft  24.8 ft 18.6 ft  14.9 ft  12.4 ft

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