Steel Gauge / Gage Thickness Chart

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Steel Gauge / Gage Thickness Chart

Steel is an alloy consisting mostly of iron, with a carbon content between 0.2% and 2.14% by weight (C:110–10Fe), depending on grade. Steel sheet metal gauge (sometimes spelled "gage") indicates the standard thickness of the sheet metal. As the gauge number increases, the material thickness decreases. The gauge of sheet metal ranges from 35 gauge to about 6 gauge. Thicknesses can vary significantly, although extremely thin thicknesses are considered foil or leaf, and pieces thicker than 6 mm (0.25 in) are considered plate.

Steel Gauge Thickness

Gauge No. Thickness
fraction inch mm
6 13/64 .2031 5.16
7 3/16 .1875 4.76
8 11/64 .1719 4.37
9 5/32 .1563 3.97
10 9/64 .1406 3.57
11 1/8 .1250 3.18
12 7/64 .1094 2.78
13 3/32 .0938 2.38
14 5/64 .0781 1.98
15 - .0703 1.79
16 1/16 .0625 1.59
17 - .0563 1.43
18 - .0500 1.27
19 - .0438 1.11
20 - .0375 .953
21 - .0344 .873
22 1/32 .0313 .794
23 - .0218 .714
24 - .0250 .635
25 - .0219 .556
26 - .0188 .478
27 - .0172 .437
28 1/64 .0156 .396
29 - .0141 .358
30 - .0125 .318
31 - .0109 .277
32 - .0102 .259
33 - .0094 .239
34 - .0086 .218
35 - .0078 .198

Nonferrous Metal Gauges (aluminum) vs. Ferrous Gauges (steel & stainless)

ALUMINUM STEEL
Gauge inch mm inch mm
3 .2294 5.827 .2391 6.073
4 .2043 5.189 .2242 5.695
5 .1819 4.620 .2092 5.314
6 .1620 4.115 .1943 4.935
7 .1443 3.665 .1793 4.554
8 .1285 3.264 .1644 4.176
9 .1144 2.906 .1495 3.797
10 .1019 2.588 .1345 3.416
11 .0907 2.304 .1196 3.030
12 .0808 2.052 .1046 2.657
13 .0720 1.829 .0897 2.278
14 .0641 1.628 .0747 1.897
15 .0571 1.450 .0673 1.709
16 .0508 1.290 .0598 1.519
17 .0453 1.151 .0538 1.367
18 .0403 1.024 .0478 1.214
19 .0359 0.912 .0418 1.062
20 .0320 0.813 .0359 0.912
21 .0285 0.724 .0329 0.836
22 .0253 0.643 .0299 0.759
23 .0226 0.574 .0269 0.683
24 .0201 0.511 .0239 0.607
25 .0179 0.455 .0209 0.531
26 .0159 0.404 .0179 0.455
27 .0142 0.361 .0164 0.417
28 .0126 0.320 .0149 0.378
29 .0113 0.287 .0135 0.343
30 .0100 0.254 .0120 0.305
31 .0089 0.226 .0105 0.267
32 .0080 0.203 .0097 0.246
33 .0071 0.180 .0090 0.229
34 .0063 0.160 .0082 0.208
35 .0056 0.142 .0075 0.191
Fraction Decimal Millimeter Conversion Table

FRACTION

DECIMAL

MILLIMETER

1/64

.0156

.3969

1/32

.0313

.7938

3/64

.0469

1.1906

1/16

.0625

1.5875

5/64

.0781

1.9844

3/32

.0938

2.3813

7/64

.1094

2.7781
1/8 .125 3.1750

9/64

.1406

3.5719

5/32

.1563

3.9688

11/64

.1719

4.3656

3/16

.1875

4.7625

13/64

.2031

5.1594

7/32

.2188

5.5563

15/64

.2344

5.9531
1/4 .250 6.3500

17/64

.2656

6.7469

9/32

.2813

7.1438

19/64

.2969

7.5406

5/16

.3125

7.9375

21/64

.3281

8.3344

11/32

.3438

8.7313

23/64

.3594

9.1281

3/8 .375 9.5250

25/64

.3906

9.9219

13/32

.4063

10.3188

27/64

.4219

10.7156

7/16

.4375

11.1125

29/64

.4531

11.5094

15/32

.4688

11.9063

31/64

.4844

12.3031

1/2 .500 12.7000

33/64

.5156

13.0969

17/32

.5313

13.4938

35/64

.5499

13.8906

9/16

.5625

14.2875

37/64

.5781

14.6844

19/32

.5938

15.0813

39/64

.6094

15.4781

5/8 .625 15.8750

41/64

.6406

16.2719

21/32

.6563

16.6688

43/64

.6719

17.0656

11/16

.6875

17.4625

45/64

.7031

17.8594

23/32

.7188

18.2563

47/64

.7344

18.6531

3/4 .750 19.0500

49/64

.7656

19.4469

25/32

.7813

19.8438

51/64

.7969

20.2406

13/16

.8125

20.6375

53/64

.8281

21.0344

27/32

.8438

21.4313

55/64

.8594

21.8281

7/8 .875 22.2250

57/64

.8906

22.6219

29/32

.9063

23.0188

59/64

.9219

23.4156

15/16

.9375

23.8125

61/64

.9531

24.2094

31/32

.9688

24.6063

63/64

.9844

25.0031

1 1.00 25.400

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