{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "swg-standard-wire-gauge-table",
 "name": "SWG standard wire gauge table (British, BS 3737): 7/0 to 50, diameter in inches and mm",
 "kind": "standard",
 "category": "Electronics",
 "group": "Wiring & connectors",
 "year": null,
 "question": "What is the diameter of 14 SWG, 18 SWG or 22 SWG wire?",
 "tags": [
  "swg",
  "standard wire gauge",
  "imperial wire gauge",
  "wire size",
  "british standard gauge",
  "bs 3737",
  "tool"
 ],
 "aliases": [
  "swg to mm",
  "swg to inches",
  "14 swg diameter",
  "18 swg wire diameter",
  "swg wire gauge chart",
  "22 swg mm",
  "swg vs awg",
  "16 swg wire",
  "swg to awg",
  "20 swg diameter",
  "10 swg in mm",
  "standard wire gauge table",
  "imperial standard wire gauge"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": false,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/swg-standard-wire-gauge-table/",
 "sheet_txt": "https://xemstudio.com/objects/swg-standard-wire-gauge-table/sheet.txt",
 "sheet": {
  "basis": "Wikipedia's Standard wire gauge table (BS 3737:1964, withdrawn), cross-checked on Engineering ToolBox; numbers only",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "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(Imperial) wire gauge, also called the British Standard Gauge, from the table on Wikipedia, which cites BS 3737:1964 (withdrawn; the current British standard for metallic materials is BS 6722:1986).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."
  ],
  "table": {
   "columns": [
    "SWG",
    "diameter (in)",
    "diameter (mm)"
   ],
   "rows": [
    [
     "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"
    ]
   ]
  }
 },
 "sheet_text": "SWG standard wire gauge table (British, BS 3737): 7/0 to 50, diameter in inches and mm — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/swg-standard-wire-gauge-table/  (sheet CC BY 4.0)\nBasis: Wikipedia's Standard wire gauge table (BS 3737:1964, withdrawn), cross-checked on Engineering ToolBox; numbers only\nCatalog version: 2026-10-20\n\nSizes: see table below\n- 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.\n- 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).\n- 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.\n\nSWG  diameter (in)  diameter (mm)\n7/0  0.500  12.700\n6/0  0.464  11.786\n5/0  0.432  10.973\n4/0  0.400  10.160\n3/0  0.372  9.449\n2/0  0.348  8.839\n0 (also written 1/0)  0.324  8.230\n1  0.300  7.620\n2  0.276  7.010\n3  0.252  6.401\n4  0.232  5.893\n5  0.212  5.385\n6  0.192  4.877\n7  0.176  4.470\n8  0.160  4.064\n9  0.144  3.658\n10  0.128  3.251\n11  0.116  2.946\n12  0.104  2.642\n13  0.092  2.337\n14  0.080  2.032\n15  0.072  1.829\n16  0.064  1.626\n17  0.056  1.422\n18  0.048  1.219\n19  0.040  1.016\n20  0.036  0.914\n21  0.032  0.813\n22  0.028  0.711\n23  0.024  0.610\n24  0.022  0.559\n25  0.020  0.5080\n26  0.018  0.4572\n27  0.0164  0.4166\n28  0.0148  0.3759\n29  0.0136  0.3454\n30  0.0124  0.3150\n31  0.0116  0.2946\n32  0.0108  0.2743\n33  0.0100  0.2540\n34  0.0092  0.2337\n35  0.0084  0.2134\n36  0.0076  0.1930\n37  0.0068  0.1727\n38  0.0060  0.1524\n39  0.0052  0.1321\n40  0.0048  0.1219\n41  0.0044  0.1118\n42  0.0040  0.1016\n43  0.0036  0.0914\n44  0.0032  0.0813\n45  0.0028  0.0711\n46  0.0024  0.0610\n47  0.0020  0.0508\n48  0.0016  0.0406\n49  0.0012  0.0305\n50  0.0010  0.0254\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: Standard wire gauge: SWG 7/0 to 50 in inches and mm (BS 3737:1964, withdrawn) — web — Publisher's page; dimensions are facts — https://en.wikipedia.org/wiki/Standard_wire_gauge\n- Engineering ToolBox: SWG - Standard Wire Gauge: the same table, used as a cross-check — web — Publisher's page; dimensions are facts — https://engineeringtoolbox.com/swg-standard-wire-gauge-d_1779.html\n\nNo true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.\nAPI: https://xemstudio.com/api/geometry?object=swg-standard-wire-gauge-table\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "Standard wire gauge: SWG 7/0 to 50 in inches and mm (BS 3737:1964, withdrawn)",
   "url": "https://en.wikipedia.org/wiki/Standard_wire_gauge",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Engineering ToolBox",
   "title": "SWG - Standard Wire Gauge: the same table, used as a cross-check",
   "url": "https://engineeringtoolbox.com/swg-standard-wire-gauge-d_1779.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "awg-wire-gauge-table-astm-b258",
  "metric-wire-sizes-iec-60228-mm2-awg",
  "sheet-metal-gauge-chart-steel-galvanized-stainless-aluminum",
  "music-wire-sizes"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no tolerance added)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no tolerance added. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn. Typical accuracy by process and ISO 286 fits: https://xemstudio.com/tolerances/",
 "mating": [],
 "faq": [
  {
   "q": "What is the diameter of 14 SWG?",
   "a": "0.080 in (2.032 mm)."
  },
  {
   "q": "What is 18 SWG in mm?",
   "a": "1.219 mm (0.048 in)."
  },
  {
   "q": "Is SWG the same as AWG?",
   "a": "No: 10 SWG is 0.128 in (3.251 mm), 10 AWG is 0.1019 in (2.59 mm)."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/swg-standard-wire-gauge-table/index.md"
}