🔌 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 DOUBTMinimum Wire Gauge
4
AWG
Amperage
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System Voltage
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Run Length
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Voltage Drop
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Recommended Fuse
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Wire Type
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🔎 What This Means
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Quick Reference
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.
| AWG | Max Amps (10 ft) | Max Amps (20 ft) | Common Uses |
|---|---|---|---|
| 18 AWG | 8A | 5A | Interior lights, small accessories |
| 16 AWG | 13A | 8A | Fans, USB hubs, signal wiring |
| 14 AWG | 17A | 11A | General accessories, speaker wire |
| 12 AWG | 23A | 15A | Fridge, lighting runs, small amps |
| 10 AWG | 33A | 21A | Solar runs, dual battery connects |
| 8 AWG | 46A | 30A | Mid-size amps, inverters up to 500W |
| 6 AWG | 61A | 40A | Large amps, inverters up to 750W |
| 4 AWG | 80A | 54A | High-current amps, 1000W inverters |
| 2 AWG | 100A | 68A | Big 3 upgrade, 1500W+ inverters |
| 1/0 AWG | 125A | 83A | High-output alternator runs, large systems |
| 2/0 AWG | 150A | 100A | Competition audio, off-grid battery banks |
| 4/0 AWG | 200A+ | 135A | Heavy duty battery cables, large inverters |