# SWG standard wire gauge table (British, BS 3737): 7/0 to 50, diameter in inches and mm

> What is the diameter of 14 SWG, 18 SWG or 22 SWG wire?

- Category: Electronics › Wiring & connectors
- Kind: Standard part
- Basis: Wikipedia's Standard wire gauge table (BS 3737:1964, withdrawn), cross-checked on Engineering ToolBox; numbers only
- Page: https://xemstudio.com/objects/swg-standard-wire-gauge-table/ · JSON: https://xemstudio.com/api/geometry?object=swg-standard-wire-gauge-table · Plain text: https://xemstudio.com/objects/swg-standard-wire-gauge-table/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** True size, with no tolerance added.

## Notes

- Standard (Imperial) wire gauge, also called the British Standard Gauge, from the table on Wikipedia, which cites BS 3737:1964 (withdrawn; the current British standard for metallic materials is BS 6722:1986). Cross-checked against the Engineering ToolBox SWG table: all inch values are the same and all mm values agree to rounding, with one disagreement: for gauge 0 (written 1/0 on the Engineering ToolBox) Wikipedia prints 8.230 mm, Engineering ToolBox 8.236 mm. 0.324 in × 25.4 is 8.2296 mm, so the Wikipedia number is shown and the other is not used.
- SWG is not AWG: 10 SWG is 0.128 in, 10 AWG is 0.1019 in (see the AWG page). SWG is used for wire in the UK, for some sheet and for wire gauges quoted on jewellery and musical wire in British catalogues; sheet metal gauge numbers are a third, different series (see the sheet gauge page).
- Diameters only: no area, mass or resistance is on the sources read for SWG, so none is shown. No files: a wire is a plain cylinder.

## Sizes

| SWG | diameter (in) | diameter (mm) |
|---|---|---|
| 7/0 | 0.500 | 12.700 |
| 6/0 | 0.464 | 11.786 |
| 5/0 | 0.432 | 10.973 |
| 4/0 | 0.400 | 10.160 |
| 3/0 | 0.372 | 9.449 |
| 2/0 | 0.348 | 8.839 |
| 0 (also written 1/0) | 0.324 | 8.230 |
| 1 | 0.300 | 7.620 |
| 2 | 0.276 | 7.010 |
| 3 | 0.252 | 6.401 |
| 4 | 0.232 | 5.893 |
| 5 | 0.212 | 5.385 |
| 6 | 0.192 | 4.877 |
| 7 | 0.176 | 4.470 |
| 8 | 0.160 | 4.064 |
| 9 | 0.144 | 3.658 |
| 10 | 0.128 | 3.251 |
| 11 | 0.116 | 2.946 |
| 12 | 0.104 | 2.642 |
| 13 | 0.092 | 2.337 |
| 14 | 0.080 | 2.032 |
| 15 | 0.072 | 1.829 |
| 16 | 0.064 | 1.626 |
| 17 | 0.056 | 1.422 |
| 18 | 0.048 | 1.219 |
| 19 | 0.040 | 1.016 |
| 20 | 0.036 | 0.914 |
| 21 | 0.032 | 0.813 |
| 22 | 0.028 | 0.711 |
| 23 | 0.024 | 0.610 |
| 24 | 0.022 | 0.559 |
| 25 | 0.020 | 0.5080 |
| 26 | 0.018 | 0.4572 |
| 27 | 0.0164 | 0.4166 |
| 28 | 0.0148 | 0.3759 |
| 29 | 0.0136 | 0.3454 |
| 30 | 0.0124 | 0.3150 |
| 31 | 0.0116 | 0.2946 |
| 32 | 0.0108 | 0.2743 |
| 33 | 0.0100 | 0.2540 |
| 34 | 0.0092 | 0.2337 |
| 35 | 0.0084 | 0.2134 |
| 36 | 0.0076 | 0.1930 |
| 37 | 0.0068 | 0.1727 |
| 38 | 0.0060 | 0.1524 |
| 39 | 0.0052 | 0.1321 |
| 40 | 0.0048 | 0.1219 |
| 41 | 0.0044 | 0.1118 |
| 42 | 0.0040 | 0.1016 |
| 43 | 0.0036 | 0.0914 |
| 44 | 0.0032 | 0.0813 |
| 45 | 0.0028 | 0.0711 |
| 46 | 0.0024 | 0.0610 |
| 47 | 0.0020 | 0.0508 |
| 48 | 0.0016 | 0.0406 |
| 49 | 0.0012 | 0.0305 |
| 50 | 0.0010 | 0.0254 |

## Where the files are

- Wikipedia: [Standard wire gauge: SWG 7/0 to 50 in inches and mm (BS 3737:1964, withdrawn)](https://en.wikipedia.org/wiki/Standard_wire_gauge) — web — Publisher's page; dimensions are facts
- Engineering ToolBox: [SWG - Standard Wire Gauge: the same table, used as a cross-check](https://engineeringtoolbox.com/swg-standard-wire-gauge-d_1779.html) — web — Publisher's page; dimensions are facts

## Questions

**What is the diameter of 14 SWG?**

0.080 in (2.032 mm).

**What is 18 SWG in mm?**

1.219 mm (0.048 in).

**Is SWG the same as AWG?**

No: 10 SWG is 0.128 in (3.251 mm), 10 AWG is 0.1019 in (2.59 mm).

## Fits with

- [AWG wire gauge table (ASTM B258): 4/0 to 56 AWG, diameter in mils, inches and mm, area in circular mils and mm²](https://xemstudio.com/objects/awg-wire-gauge-table-astm-b258/)
- [Metric wire sizes (IEC 60228): 0.5 to 2500 mm² with strands and conductor diameter, and the nearest AWG](https://xemstudio.com/objects/metric-wire-sizes-iec-60228-mm2-awg/)
- [Sheet metal gauge chart: steel, galvanized, stainless and aluminum (10, 12, 14, 16, 18, 20 gauge in inches and mm)](https://xemstudio.com/objects/sheet-metal-gauge-chart-steel-galvanized-stainless-aluminum/)
- [Music wire diameters (ASTM A228): .015 to .250 in](https://xemstudio.com/objects/music-wire-sizes/)