Wire Gauge Converter
Convert AWG and SWG wire gauges to mm and inches with a full gauge table and circular-mil areas.
| Gauge | Inch | mm | Ω/1000ft | Typical use |
|---|---|---|---|---|
| 40 | 0.0031 | 0.0799 | 1048.8379 | extra fine magnet wire |
| 39 | 0.0035 | 0.0897 | 831.7663 | |
| 38 | 0.0040 | 0.1007 | 659.6206 | |
| 37 | 0.0045 | 0.1131 | 523.1029 | |
| 36 | 0.0050 | 0.1270 | 414.8395 | magnet wire, jewelry |
| 35 | 0.0056 | 0.1426 | 328.9827 | |
| 34 | 0.0063 | 0.1601 | 260.8951 | |
| 33 | 0.0071 | 0.1798 | 206.8992 | |
| 32 | 0.0080 | 0.2019 | 164.0786 | ribbon cable, implant leads |
| 31 | 0.0089 | 0.2268 | 130.1202 | |
| 30 | 0.0100 | 0.2546 | 103.1900 | RC models, LED strips |
| 29 | 0.0113 | 0.2859 | 81.8334 | |
| 28 | 0.0126 | 0.3211 | 64.8968 | doorbell, speakers |
| 27 | 0.0142 | 0.3606 | 51.4655 | |
| 26 | 0.0159 | 0.4049 | 40.8140 | phone/ETH solid core |
| 25 | 0.0179 | 0.4547 | 32.3670 | |
| 24 | 0.0201 | 0.5106 | 25.6682 | USB, patch cables, thermostats |
| 23 | 0.0226 | 0.5733 | 20.3558 | |
| 22 | 0.0253 | 0.6438 | 16.1429 | alarm panels, low-voltage |
| 21 | 0.0285 | 0.7229 | 12.8019 | |
| 20 | 0.0320 | 0.8118 | 10.1524 | jewelry, cartomizers |
| 19 | 0.0359 | 0.9116 | 8.0512 | |
| 18 | 0.0403 | 1.0237 | 6.3849 | lamps, extension cords |
| 17 | 0.0453 | 1.1495 | 5.0634 | |
| 16 | 0.0508 | 1.2908 | 4.0155 | appliances, AC units |
| 15 | 0.0571 | 1.4495 | 3.1844 | |
| 14 | 0.0641 | 1.6277 | 2.5254 | 15A household circuits |
AWG diameter: d(in) = 0.005 × 92^((36−n)/39) — each 6-gauge step doubles the diameter. SWG uses the fixed British standard table. Resistance assumes solid pure copper at 20 °C; stranded wire is slightly higher.
About Wire Gauge Converter
Convert AWG and SWG wire gauges to mm and inches with a full gauge table and circular-mil areas.
As a Conversion tool, Wire Gauge Converter converts between units instantly — type a value, pick the source and target units, and the result updates live as you type, so you never have to do the math by hand.
How to Use Wire Gauge Converter
- Enter the value you want to convert in the input field.
- Select the source unit and the target unit.
- Read the result instantly — it updates live as you type.
- Copy the output or swap the units to convert in the other direction.
Key Features
- Live two-way conversion — edit either side and both update together.
- Uses standard, precise conversion factors for everyday and technical use.
- Runs entirely in your browser — works offline and sends nothing anywhere.
Frequently Asked Questions
How accurate are the conversions from Wire Gauge Converter?
Conversions use standard published factors, and rounding happens only at display time. Results are precise enough for everyday, academic and engineering use.
Is Wire Gauge Converter free to use?
Yes. Wire Gauge Converter is completely free with unlimited use — no account, download or payment required.
Is my data uploaded to a server?
No. Wire Gauge Converter runs entirely in your browser. Your inputs are never sent to our servers or stored anywhere.
Does Wire Gauge Converter work on mobile?
Yes. The interface is fully responsive and works in any modern browser on Android, iPhone, tablets and desktops.