Free Tool

Wire Gauge Calculator

Stop guessing on wire size. Enter your amps, voltage, and run length — get the right AWG every time, whether you're wiring a rig or a 2,000 watt amp.

🔌 Wire Gauge Calculator

Works for 12V, 24V & 48V systems

System Voltage
Or use watts below to calculate
Watts ÷ Volts = Amps
One-way distance from source to device
3% is best for sensitive electronics
Wire Type
OFC (pure copper) is always preferred. CCA (copper-clad aluminum) requires sizing up one gauge.

✅ Your Results

ALWAYS SIZE UP IN DOUBT
Minimum Wire Gauge
4
AWG
Amperage
System Voltage
Run Length
Voltage Drop
Recommended Fuse
Wire Type
🔎 What This Means
AWG Wire Gauge Chart

This table shows common wire gauges and their maximum amp ratings for 12V automotive and off-grid applications at a 3% voltage drop over a 10-foot run. Always size up for longer runs or higher loads.

AWGMax Amps (10 ft)Max Amps (20 ft)Common Uses
18 AWG8A5AInterior lights, small accessories
16 AWG13A8AFans, USB hubs, signal wiring
14 AWG17A11AGeneral accessories, speaker wire
12 AWG23A15AFridge, lighting runs, small amps
10 AWG33A21ASolar runs, dual battery connects
8 AWG46A30AMid-size amps, inverters up to 500W
6 AWG61A40ALarge amps, inverters up to 750W
4 AWG80A54AHigh-current amps, 1000W inverters
2 AWG100A68ABig 3 upgrade, 1500W+ inverters
1/0 AWG125A83AHigh-output alternator runs, large systems
2/0 AWG150A100ACompetition audio, off-grid battery banks
4/0 AWG200A+135AHeavy duty battery cables, large inverters