⚡ Wire Gauge / AWG Calculator
American Wire Gauge (AWG) reference and calculators. Look up wire properties, calculate voltage drop over a run, and find the minimum gauge for any circuit.
AWG Wire Properties Lookup
Select a gauge and application to see diameter, cross-section, resistance, and rated current capacity.
Remember: Higher AWG number = thinner wire. AWG 30 is hair-thin; AWG 4/0 is thumb-thick. Always verify the rated ampacity for your specific wire insulation and installation method.
Voltage Drop Calculator
Calculates round-trip (there and back) resistive voltage drop for a DC circuit. NEC recommends ≤3% for branch circuits, ≤5% total from service panel.
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Round trip: Voltage drop uses the full circuit length — wire going to the load plus wire coming back. A 25ft run means 50ft of current path.
Wire Sizer — Find Minimum AWG
Enter your circuit requirements and get the lightest wire gauge that keeps voltage drop within your limit. Also checks ampacity rating.
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Always verify: The sizer finds the minimum gauge for voltage drop only. Local codes, conduit fill, insulation type, and ambient temperature may require a heavier gauge. When in doubt, go one size heavier.
Complete AWG Reference Table
All standard AWG gauges. Ampacity ratings per UL/NEC guidelines at stated temperature. Resistance at 20°C (68°F) copper conductor.
| AWG | Dia. (mm) | Dia. (in) | Area (mm²) | Ω/1000ft | Ω/100m | Chassis 60°C (A) | Power 75°C (A) | Hot 90°C (A) | NEC 60°C (A) |
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