Sheet metal usually refers to making a metal sheet with a given thickness into a functional part through a variety of cold processing methods such as shearing, punching, bending and forming. Through these cold working methods, the thickness change of sheet metal parts can be more stable. When working with sheet metal, it is common for the term “gauge” to be used. This guide will explain the gauge system with presenting a sheet metal gauge size chart.

## What Is the Function of Sheet Metal Gauges?

When specifying the thickness of a sheet metal, gauges are employed to do so. Measurement gauges are neither standard nor metric in nature, and the values they produce are not dependent on any of these measurement systems. When determining the actual thickness of sheet metal in inches or millimeters, gauges of sheet metal chart can be utilized to help you. In the example above, 18 gauge steel is 0.0478 inch or 1.214 millimeter in thickness, according to a gauge conversion chart. The gauge number “18” has no significance in relation to the actual measurements.

There are multiple different gauge systems in use today, with unique gauge designations for certain metal kinds being used in each system. According to one gauge system, 18 gauge steel is 0.0478 inches thick, and 18 gauge aluminum is 0.0403 inches thick in the same gauge system. Because of the different thicknesses of the metal, a gauge chart should be used to check that the metal satisfies the requisite specifications before usage.

## Sheet Metal Gauge Size Chart

Gauge sizes are a series of numbers that represent the thickness of an individual of sheet metal, with a higher number indicating a thinner sheet. Depending on the gauge size standard used, the corresponding thicknesses will differ for each material. Gauge size standards were devised in order to account for the weight of the sheet for each material.

The following sheet metal gauge size table chart gives the weight and thickness of sheet metal given as a “gauge” and indicates the standard thickness of sheet metal and wire. For most materials, as the gauge number increases, the material thickness decreases.

1.Standard Steel Gauge Size Chart

ThicknessWeight Per Area
Gaugeinmmlb/ft²kg/m²
30.23916.0739.75447.624
40.22425.6959.14644.656
50.20925.3148.53441.668
60.19434.9357.92738.701
70.17934.5547.31535.713
80.16444.1766.70732.745
90.14953.7976.09929.777
100.13453.4165.48726.790
110.11963.0384.87923.822
120.10462.6574.26720.834
130.08972.2783.65917.866
140.07471.8973.04714.879
150.06731.7092.74613.405
160.05981.5192.44011.911
170.05381.3672.19510.716
180.04781.2141.9509.521
190.04181.0621.7058.326
200.03590.9121.4657.151
210.03290.8361.3426.553
220.02990.7591.2205.955
230.02690.6831.0975.358
240.02390.6070.9754.760
250.02090.5310.8534.163
260.01790.4550.7303.565
270.01640.4170.6693.267
280.01490.3780.6082.968
290.01350.3430.5512.689
300.01200.3050.4902.390
310.01050.2670.4282.091
320.00970.2460.3961.932
330.00900.2290.3671.793
340.00820.2080.3351.633
350.00750.1910.3061.494
360.00670.1700.2731.335
370.00640.1630.2611.275
380.00600.1520.2451.195

2.Galvanized Steel Gauge Size Chart

ThicknessWeight Per Area
Gaugeinmmlb/ft²kg/m²
80.16814.2706.85833.482
90.15323.8916.25030.514
100.13823.5105.63827.527
110.12333.1325.03024.559
120.10842.7534.42221.591
130.09342.3723.81018.603
140.07851.9943.20215.636
150.07101.8032.89614.142
160.06351.6132.59012.648
170.05751.4612.34611.453
180.05161.3112.10510.278
190.04561.1581.8609.083
200.03961.0061.6157.888
210.03660.9301.4937.290
220.03360.8531.3716.692
230.03060.7771.2486.095
240.02760.7011.1265.497
250.02470.6271.0084.920
260.02170.5510.8854.322
270.02020.5130.8244.023
280.01870.4750.7633.725
290.01720.4370.7023.426
300.01570.3990.6403.127
310.01420.3610.5792.828
320.01340.3400.5472.669

3.Stainless Steel Gauge Size Chart

ThicknessWeight Per Area
Gaugeinmmlb/ft²kg/m²
00000000.500012.70020.808101.594
0000000.468611.90219.50195.213
000000.437511.11318.20788.894
00000.406310.32016.90982.555
0000.37509.52515.60676.195
000.34388.73314.30869.856
00.31257.93813.00563.496
10.28137.14511.70757.157
20.26566.74611.05353.966
30.25006.35010.40450.797
40.23445.9549.75547.627
50.21875.5559.10144.437
60.20315.1598.45241.267
70.18754.7637.80338.098
80.17194.3667.15434.928
90.15623.9676.50031.738
100.14063.5715.85128.568
110.12503.1755.20225.398
120.10942.7794.55322.229
130.09372.3803.89919.039
140.07811.9843.25015.869
150.07031.7862.92614.284
160.06251.5882.60112.699
170.05621.4272.33911.419
180.05001.2702.08110.159
190.04371.1101.8198.879
200.03750.9531.5617.620
210.03440.8741.4326.990
220.03120.7921.2986.339
230.02810.7141.1695.710
240.02500.6351.0405.080
250.02190.5560.9114.450
260.01870.4750.7783.800
270.01720.4370.7163.495
280.01560.3960.6493.170
290.01410.3580.5872.865
300.01250.3180.5202.540
310.01090.2770.4542.215
320.01020.2590.4242.073
330.00940.2390.3911.910
340.00860.2180.3581.747
350.00780.1980.3251.585
360.00700.1780.2911.422
370.00660.1680.2751.341
380.00620.1570.2581.260

4.Aluminium Gauge Size Chart

ThicknessWeight Per Area
Gaugeinmmlb/ft²kg/m²
0000000.580014.7328.18539.962
000000.516513.1197.28935.587
00000.460011.6846.49231.694
0000.409610.4045.78028.222
000.36489.2665.14825.135
00.32498.2524.58522.386
10.28937.3484.08319.933
20.25766.5433.63517.749
30.22945.8273.23715.806
40.20435.1892.88314.076
50.18194.6202.56712.533
60.16204.1152.28611.162
70.14433.6652.0369.942
80.12853.2641.8138.854
90.11442.9061.6147.882
100.10192.5881.4387.021
110.09072.3041.2806.249
120.08082.0521.1405.567
130.07201.8291.0164.961
140.06411.6280.9054.417
150.05711.4500.8063.934
160.05081.2900.7173.500
170.04531.1510.6393.121
180.04031.0240.5692.777
190.03590.9120.5072.474
200.03200.8130.4522.205
210.02850.7240.4021.964
220.02530.6430.3571.743
230.02260.5740.3191.557
240.02010.5110.2841.385
250.01790.4550.2531.233
260.01590.4040.2241.096
270.01420.3610.2000.978
280.01260.3200.1780.868
290.01130.2870.1590.779
300.01000.2540.1410.689
310.00890.2260.1260.613
320.00800.2030.1130.551
330.00710.1800.1000.489
340.00630.1600.0890.434
350.00560.1420.0790.386
360.00500.1270.0710.345
370.00450.1140.0640.310
380.00400.1020.0560.276
390.00350.0890.0490.241
400.00310.0790.0440.214

5.Zinc Gauge Size Chart

ThicknessWeight Per Area
Gaugeinmmlb/ft²kg/m²
281.000025.40037.152181.392
270.500012.70018.57690.696
260.37509.52513.93268.022
250.25006.3509.28845.348
240.12503.1754.64422.674
230.10002.5403.71518.139
220.09002.2863.34416.325
210.08002.0322.97214.511
200.07001.7782.60112.697
190.06001.5242.22910.884
180.05501.3972.0439.977
170.05001.2701.8589.070
160.04501.1431.6728.163
150.04001.0161.4867.256
140.03600.9141.3376.530
130.03200.8131.1895.805
120.02800.7111.0405.079
110.02400.6100.8924.353
100.02000.5080.7433.628
90.01800.4570.6693.265
80.01600.4060.5942.902
70.01400.3560.5202.539
60.01200.3050.4462.177
50.01000.2540.3721.814
40.00800.2030.2971.451
30.00600.1520.2231.088
20.00400.1020.1490.726
10.00200.0510.0740.363

6.Birmingham Gage Size Chart

Thickness
Gaugeinmm
00000000.666616.932
0000000.625015.875
000000.588314.943
00000.541613.757
0000.500012.700
000.445211.308
00.396410.069
10.35328.971
20.31477.993
30.28047.122
40.25006.350
50.22255.652
60.19815.032
70.17644.481
80.15703.988
90.13983.551
100.12503.175
110.11132.827
120.09912.517
130.08822.240
140.07851.994
150.06991.775
160.06251.588
170.05561.412
180.04951.257
190.04401.118
200.03920.996
210.03490.886
220.03120.792
230.02780.706
240.02470.627
250.02200.559
260.01960.498
270.01740.442
280.01560.396
290.01390.353
300.01230.312
310.01100.279
320.00980.249
330.00870.221
340.00770.196
350.00690.175
360.00610.155
370.00540.137
380.00480.122
390.00430.109
400.00380.097
410.00340.086
420.00300.076
430.00270.069
440.00240.061
450.00210.053
460.00190.048
470.00170.043
480.00160.041
490.00130.033
500.00120.030
510.00110.027
520.00100.024