Gauge to mm : AWG, SWG & Sheet Metal Gauge Measurement Systems

What is Gauge?
Types & Usage of Gauge
American Wire Gauge (AWG) / Brown & Sharpe wire gauge (B&S)
- American Wire Gauge to mm and inch conversion chart
Standard Wire Gauge (SWG)
- Standard Wire Gauge to mm and inch conversion chart
Sheet Metal Gauge (SMG)
- Sheet Metal Gauge thickness to mm conversion chart
- Sheet Metal Gauge thickness to inch conversion chart

What is Gauge?

Gauge is a standard measurement unit that is used to determine the thickness or diameter of wires and metal sheets.

Types & Usage of Gauge

For measuring the diameter or thickness of wires American Wire Gauge (AWG) and Standard Wire Gauge (SWG) systems are mostly used SWG also so used to measure the thickness of metal sheets and Sheet Metal Gauge (SMG) system is specifically used for measuring the thickness of metal sheets.

American Wire Gauge (AWG) / Brown & Sharpe wire gauge (B&S)

AWG also known as B&S wire gauge system was introduced in America on 1857 to measure the size of wires. AWG measuring system allocates the gauges number starting from 0000 to 40 for different diameter of wires. Theses number are inversely allocated, smallest size of wire allocated 40 gauge number and largest size of wire has allocated 0000 gauge number. AWG system is mostly using in American region.

American Wire Gauge to mm and inch conversion chart:

AWG Number	Thickness in mm	Thickness in inches
Gauge 0000 (4/0)	11.684	0.4600
Gauge 000 (3/0)	10.404	0.4096
Gauge 00 (2/0)	9.266	0.3648
Gauge 0 (1/0)	8.252	0.3249
Gauge 1	7.348	0.2893
Gauge 2	6.544	0.2576
Gauge 3	5.827	0.2294
Gauge 4	5.189	0.2043
Gauge 5	4.621	0.1819
Gauge 6	4.115	0.1620
Gauge 7	3.665	0.1443
Gauge 8	3.264	0.1285
Gauge 9	2.906	0.1144
Gauge 10	2.588	0.1019
Gauge 11	2.305	0.0907
Gauge 12	2.053	0.0808
Gauge 13	1.828	0.0720
Gauge 14	1.628	0.0641
Gauge 15	1.450	0.0571
Gauge 16	1.291	0.0508
Gauge 17	1.150	0.0453
Gauge 18	1.024	0.0403
Gauge 19	0.912	0.0359
Gauge 20	0.812	0.0320
Gauge 21	0.723	0.0285
Gauge 22	0.644	0.0253
Gauge 23	0.573	0.0226
Gauge 24	0.511	0.0201
Gauge 25	0.455	0.0179
Gauge 26	0.405	0.0159
Gauge 27	0.361	0.0142
Gauge 28	0.321	0.0126
Gauge 29	0.286	0.0113
Gauge 30	0.255	0.0100
Gauge 31	0.227	0.00893
Gauge 32	0.202	0.00795
Gauge 33	0.180	0.00708
Gauge 34	0.160	0.00630
Gauge 35	0.143	0.00561
Gauge 36	0.127	0.00500
Gauge 37	0.113	0.00445
Gauge 38	0.101	0.00397
Gauge 39	0.0897	0.00353
Gauge 40	0.0799	0.00314

Standard Wire Gauge (SWG)

SWG, originally developed in the UK, is a gauge system mainly used for measuring wire diameter and thickness. The SWG system allocates gauge numbers from 7/0 to 50, where smaller wires have higher gauge numbers and larger wires have lower gauge numbers. It’s commonly used in Europe.

Standard Wire Gauge to mm and inch conversion chart:

SWG Number	Thickness in mm	Thickness in inches
Gauge 0	8.230	0.3240
Gauge 1	7.620	0.3000
Gauge 2	7.010	0.2760
Gauge 3	6.401	0.2520
Gauge 4	5.893	0.2320
Gauge 5	5.385	0.2120
Gauge 6	4.877	0.1920
Gauge 7	4.470	0.1760
Gauge 8	4.064	0.1600
Gauge 9	3.658	0.1440
Gauge 10	3.251	0.1280
Gauge 11	2.946	0.1160
Gauge 12	2.642	0.1040
Gauge 13	2.337	0.0920
Gauge 14	2.032	0.0800
Gauge 15	1.829	0.0720
Gauge 16	1.626	0.0640
Gauge 17	1.422	0.0560
Gauge 18	1.219	0.0480
Gauge 19	1.016	0.0400
Gauge 20	0.914	0.0360
Gauge 21	0.813	0.0320
Gauge 22	0.711	0.0280
Gauge 23	0.635	0.0250
Gauge 24	0.558	0.0220
Gauge 25	0.508	0.0200
Gauge 26	0.457	0.0180
Gauge 27	0.416	0.0164
Gauge 28	0.376	0.0148
Gauge 29	0.345	0.0136
Gauge 30	0.315	0.0124
Gauge 31	0.295	0.0116
Gauge 32	0.274	0.0108
Gauge 33	0.254	0.0100
Gauge 34	0.234	0.0092
Gauge 35	0.213	0.0084
Gauge 36	0.193	0.0076
Gauge 37	0.173	0.0068
Gauge 38	0.152	0.0060
Gauge 39	0.132	0.0052
Gauge 40	0.122	0.0048
Gauge 41	0.112	0.0044
Gauge 42	0.102	0.0040
Gauge 43	0.091	0.0036
Gauge 44	0.081	0.0032
Gauge 45	0.071	0.0028
Gauge 46	0.061	0.0024
Gauge 47	0.051	0.0020
Gauge 48	0.041	0.0016
Gauge 49	0.031	0.0012
Gauge 50	0.025	0.0010

Sheet Metal Gauge (SMG)

SMG is specifically used to measure the thickness of metal sheets. The system works similarly to other gauge systems, where higher gauge numbers represent thinner sheets and lower numbers represent thicker sheets. SMG is used worldwide.

Sheet Metal Gauge thickness to mm conversion chart:

SMG Number	Standard Steel (mm)	Galvanized Steel (mm)	Stainless Steel (mm)	Aluminum (mm)	Copper (mm)
Gauge 1	7.620	7.620	7.620	6.350	6.350
Gauge 2	6.350	6.350	6.350	5.159	5.159
Gauge 3	5.490	5.490	5.556	4.762	4.762
Gauge 4	5.000	5.000	5.080	4.191	4.191
Gauge 5	4.500	4.500	4.500	3.810	3.810
Gauge 6	4.115	4.115	4.191	3.404	3.404
Gauge 7	3.658	3.658	3.962	3.048	3.048
Gauge 8	3.264	3.264	3.571	2.769	2.769
Gauge 9	2.946	2.946	3.175	2.588	2.588
Gauge 10	3.416	3.416	3.571	2.588	2.588
Gauge 11	3.048	3.048	3.175	2.304	2.304
Gauge 12	2.657	2.769	2.778	2.052	2.052
Gauge 13	2.380	2.393	2.381	1.828	1.828
Gauge 14	2.108	2.108	1.984	1.628	1.628
Gauge 15	1.829	1.829	1.786	1.448	1.448
Gauge 16	1.613	1.613	1.588	1.290	1.290
Gauge 17	1.448	1.473	1.372	1.150	1.150
Gauge 18	1.214	1.214	1.270	1.024	1.024
Gauge 19	1.067	1.067	1.067	0.912	0.912
Gauge 20	0.953	0.953	0.914	0.813	0.813
Gauge 21	0.839	0.839	0.813	0.724	0.724
Gauge 22	0.759	0.759	0.711	0.644	0.644
Gauge 23	0.686	0.686	0.635	0.574	0.574
Gauge 24	0.610	0.610	0.559	0.511	0.511
Gauge 25	0.508	0.508	0.508	0.455	0.455
Gauge 26	0.457	0.457	0.457	0.404	0.404
Gauge 27	0.406	0.406	0.406	0.361	0.361
Gauge 28	0.356	0.356	0.356	0.321	0.321
Gauge 29	0.305	0.305	0.305	0.287	0.287
Gauge 30	0.254	0.254	0.254	0.255	0.255
Gauge 31	0.229	0.229	0.229	0.227	0.227
Gauge 32	0.203	0.203	0.203	0.200	0.200
Gauge 33	0.178	0.178	0.178	0.180	0.180
Gauge 34	0.152	0.152	0.152	0.160	0.160
Gauge 35	0.127	0.127	0.127	0.140	0.140
Gauge 36	0.102	0.102	0.102	0.127	0.127
Gauge 37	0.089	0.089	0.089	0.110	0.110
Gauge 38	0.076	0.076	0.076	0.086	0.086
Gauge 39	0.063	0.063	0.076	0.076	0.076
Gauge 40	0.051	0.051	0.051	0.063	0.063

Sheet Metal Gauge thickness to inch conversion chart:

SMG Number	Standard Steel (inches)	Galvanized Steel (inches)	Stainless Steel (inches)	Aluminum (inches)	Copper (inches)
Gauge 1	0.299	0.299	0.299	0.250	0.250
Gauge 2	0.250	0.250	0.250	0.203	0.203
Gauge 3	0.216	0.216	0.218	0.187	0.187
Gauge 4	0.197	0.197	0.200	0.165	0.165
Gauge 5	0.177	0.177	0.177	0.150	0.150
Gauge 6	0.162	0.162	0.165	0.134	0.134
Gauge 7	0.144	0.144	0.156	0.120	0.120
Gauge 8	0.128	0.128	0.141	0.109	0.109
Gauge 9	0.116	0.116	0.125	0.102	0.102
Gauge 10	0.102	0.102	0.111	0.091	0.091
Gauge 11	0.090	0.090	0.093	0.081	0.081
Gauge 12	0.075	0.075	0.079	0.072	0.072
Gauge 13	0.064	0.064	0.064	0.064	0.064
Gauge 14	0.055	0.055	0.054	0.064	0.055
Gauge 15	0.048	0.048	0.048	0.045	0.045
Gauge 16	0.040	0.040	0.040	0.040	0.040
Gauge 17	0.036	0.036	0.036	0.036	0.036
Gauge 18	0.032	0.032	0.032	0.032	0.032
Gauge 19	0.027	0.027	0.027	0.027	0.027
Gauge 20	0.025	0.025	0.025	0.025	0.025
Gauge 21	0.023	0.023	0.023	0.023	0.023
22	0.021	0.021	0.021	0.021	0.021
Gauge 23	0.018	0.018	0.018	0.018	0.018
Gauge 24	0.016	0.016	0.016	0.016	0.016
Gauge 25	0.014	0.014	0.014	0.014	0.014
Gauge 26	0.013	0.013	0.013	0.013	0.013
Gauge 27	0.012	0.012	0.012	0.012	0.012
Gauge 28	0.010	0.010	0.010	0.010	0.010
Gauge 29	0.009	0.009	0.009	0.009	0.009
Gauge 30	0.008	0.008	0.008	0.008	0.008
Gauge 31	0.007	0.007	0.007	0.007	0.007
Gauge 32	0.006	0.006	0.006	0.006	0.006
Gauge 33	0.005	0.005	0.005	0.005	0.005
Gauge 34	0.004	0.004	0.004	0.004	0.004
Gauge 35	0.003	0.003	0.003	0.003	0.003
Gauge 36	0.0025	0.0025	0.0025	0.0025	0.0025
Gauge 37	0.0021	0.0021	0.0021	0.0021	0.0021
Gauge 38	0.0018	0.0018	0.0018	0.0018	0.0018