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Home Wiring (NEC)
Standard gauges for residential circuits. Always check local codes.
- •14 AWG (15A) - Lighting circuits
- •12 AWG (20A) - Standard outlets
- •10 AWG (30A) - Dryers & Water Heaters
The ultimate electrical reference. Convert AWG to mm/mm², check ampacity ratings for copper and aluminum, and find the perfect wire size for any project.
Home Wiring • 4/0 to 30 AWG
ChartsPrintables.com
Rows
21
Range
4/0 to 30 AWG
PDF FILE SIZE
≈0KB
Quality
300 DPI
From household wiring to automotive circuits, choose the right gauge for safety and performance.
AWG (American Wire Gauge) works backwards: the larger the number, the thinner the wire. 18 AWG is thin; 4/0 AWG is thick.
Use the Ampacity columns to ensure your wire can handle the current. Ratings depend on temperature (60°C/75°C) and material (Copper/Aluminum).
For long runs (like garden lights or RVs), use thicker wire (lower AWG) to prevent voltage drop. Check the resistance values.
Practical guide to standard wire sizes for every job.
Standard gauges for residential circuits. Always check local codes.
Low voltage DC systems for cars, trucks, and boats.
Precision wiring for PCBs, breadboards, and small devices.
Key factors affecting wire selection beyond just the gauge number.
Solid wire is cheaper and better for house wiring (push-in connectors). Stranded is flexible and durable, ideal for automotive and moving parts.
Aluminum is lighter but has higher resistance. You typically need one size larger aluminum wire to carry the same current as copper.
International standard uses cross-sectional area (mm²). 14 AWG ≈ 2.08 mm², 12 AWG ≈ 3.31 mm². Use the chart to convert.
Wire capacity depends on insulation rating (60°C, 75°C, 90°C). THHN wire (90°C) handles more current than TW wire (60°C).
Complete your workshop reference collection.
| Millimeters | Decimal (in) | Fraction (in) |
|---|---|---|
| 0.5 | 0.020 | 0 |
| 1 | 0.039 | 1/16 |
| 6.35 | 0.250 | 1/4 |
| 12.7 | 0.500 | 1/2 |
| 19 | 0.748 | 3/4 |
| 25.4 | 1.000 | 1 |
| 38.1 | 1.500 | 1 1/2 |
| 50.8 | 2.000 | 2 |
| 76.2 | 3.000 | 3 |
| 101.6 | 4.000 | 4 |
Convert millimeters to inches with decimals and fractions for woodworking and engineering.
View chart| Inches (fraction) | Inches (decimal) | Millimeters | Centimeters |
|---|---|---|---|
| 1/4" | 0.250 | 6.35 | 0.64 |
| 1/2" | 0.500 | 12.70 | 1.27 |
| 1" | 1.000 | 25.40 | 2.54 |
| 1 1/2" | 1.500 | 38.10 | 3.81 |
| 2" | 2.000 | 50.80 | 5.08 |
| 2 1/2" | 2.500 | 63.50 | 6.35 |
| 3" | 3.000 | 76.20 | 7.62 |
| 4" | 4.000 | 101.60 | 10.16 |
| 5" | 5.000 | 127.00 | 12.70 |
| 6" | 6.000 | 152.40 | 15.24 |
Imperial to metric conversions for hardware sizing and fabrication.
View chart| Number | Fraction | Decimal (in) | Millimeters |
|---|---|---|---|
| #80 | — | 0.0135 | 0.34 |
| #50 | — | 0.0700 | 1.78 |
| #52 | 1/16" | 0.0625 | 1.59 |
| #41 | 3/32" | 0.0938 | 2.38 |
| #22 | 5/32" | 0.1562 | 3.97 |
| #11 | 3/16" | 0.1875 | 4.76 |
| #7 | 13/64" | 0.2031 | 5.16 |
| — | — | 0.2570 | 6.53 |
| — | 3/8" | 0.3750 | 9.53 |
| — | 1/2" | 0.5000 | 12.70 |
Numbered, lettered, metric, and fractional drill bit reference.
View chart| PSI | Bar | kPa |
|---|---|---|
| 10 | 0.69 | 69 |
| 20 | 1.38 | 138 |
| 30 | 2.07 | 207 |
| 32 | 2.21 | 221 |
| 35 | 2.41 | 241 |
| 40 | 2.76 | 276 |
| 50 | 3.45 | 345 |
| 60 | 4.14 | 414 |
| 80 | 5.52 | 552 |
| 100 | 6.89 | 689 |
Professional PSI to Bar conversion table for tires, hydraulics, and diving. Includes kPa and atm.
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Common questions about wire sizing and electrical standards.