Wire gauges

Wire gauge reference comparing Washburn & Moen, British Imperial, Birmingham/Stubs and American (Brown & Sharpe) diameters by gauge number.

Wire gauges
Gauge Washburn & Moen British Imperial standard (S.W.G.) Birmingham or Stubs American or Brown & Sharp
7/0 .4900″ .500″ — —
6/0 .4615″ .464″ — .5800″
5/0 .4305″ .432″ .500″ .5165″
5/0 .4305″ .432″ .500″ .5165″
4/0 .3938″ .400″ .454″ .4600″
3/0 .3625″ .372″ .425″ .4096″
2/0 .3310″ .348″ .380″ .3648″
1/0 .3065″ .324″ .340″ .3249″
1 .2830″ .300″ .300″ .2893″
2 .2625″ .276″ .284″ .2576″
3 .2437″ .252″ .259″ .2294″
4 .2253″ .232″ .238″ .2043″
5 .2070″ .212″ .220″ .1819″
6 .1920″ .192″ .203″ .1620″
7 .1770″ .176″ .180″ .1442″
8 .1620″ .160″ .165″ .1284″
9 .1483″ .144″ .148″ .1144″
10 .1350″ .128″ .134″ .1018″
11 .1205″ .116″ .120″ .0907″
12 .1055″ .104″ .109″ .0808″
13 .0915″ .092″ .095″ .0719″
14 .0800″ .080″ .083″ .0640″
15 .0720″ .072″ .072″ .0570″
16 .0625″ .064″ .065″ .0508″
17 .0540″ .056″ .058″ .0452″
18 .0475″ .048″ .049″ .0403″
19 .0410″ .040″ .042″ .0358″
20 .0348″ .036″ .035″ .0319″
21 .0317″ .032″ .032″ .0284″
22 .0286″ .028″ .028″ .0253″
23 .0258″ .024″ .025″ .0225″
24 .0230″ .022″ .022″ .0201″
25 .0204″ .020″ .020″ .0179″
26 .0181″ .018″ .018″ .0159″
27 .0173″ .0164″ .016″ .0141″
28 .0162″ .0148″ .014″ .0126″
29 .0150″ .0136″ .013″ .0112″
30 .0140″ .0124″ .012″ .0100″
31 .0132″ .0116 .010″ .0089″
32 .0128″ .0108″ .009″ .0079″
33 .0118″ .0100″ .008″ .0070″
34 .0104″ .0092″ .007″ .0063″
35 .0095″ .0084″ .005″ .0056″
36 .0090″ .0076″ .004″ .0050″
37 .0085″ .0068″ — .0044″
38 .0080″ .0060″ — .0039″
39 .0075″ .0052″ — .0035″
40 .0070″ .0048″ — .0031″
41 .0066″ .0044″ — .00280″
42 .0062″ .0040″ — .00249″
43 .0060″ .0036″ — .00222″
44 .0058″ .0032″ — .00198″
45 .0055″ .0028″ — .00176″
46 .0052″ .0024″ — .00157″
47 .0050″ .0020″ — .00140″
48 .0048″ .0016″ — .00124″
49 .0046″ .0012″ — .00111″
50 .0044″ .0010″ — .00099″