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Converting Sheet Metal Gauge To Thickness In Inches

Working with sheet metal, as shown in Figure 1, gauge sizes can be confusing at the best of times. Sheet metal gauges work opposite to what one might consider the norm. The smaller the number, the thicker the material. Hence, 4 gauge material is thicker than 6 gauge material.

sheet of steel

Figure 1 - Sheet metal

To make things more complex, the conversion from gauge thickness is different depending on the type of metal being used.

Table 1 provides a set of conversion tables for the most common sheet metals:

  • Steel
  • Galvanized Steel
  • Aluminum
  • Stainless Steel (Series 300)
  • Copper (Alloy 110)
Table 1 - Sheet Metal Gauge To Thickness In Inches
Gauge Steel In Inches Galvanized Steel In Inches Aluminum In Inches Stainless Steel, Series 300, In Inches Copper, Alloy 110, In Inches

3

0.2391

 

0.2294

   

4

0.2242

 

0.2043

   

5

0.2092

 

0.1819

   

6

0.1943

 

0.1620

   

7

0.1793

 

0.1443

   

8

0.1644

 

0.1285

   

9

0.1495

0.1532

0.1144

   

10

0.1345

0.1382

0.1019

0.134

 

11

0.1196

0.1233

0.0907

0.119

 

12

0.1046

0.1084

0.0808

0.103

 

13

0.0897

0.0934

0.0720

   

14

0.0747

0.0785

0.0641

0.074

 

15

0.0673

0.0710

0.0571

   

16

0.0598

0.0635

0.0508

0.059

 

17

0.0538

0.0575

0.0453

   

18

0.0478

0.0516

0.0403

0.047

0.040

19

0.0418

0.0456

0.0359

   

20

0.0359

0.0396

0.0320

0.035

0.032

21

0.0329

0.0366

0.0285

   

22

0.0299

0.0336

0.0253

0.030

0.025

23

0.0269

0.0306

0.0226

   

24

0.0239

0.0276

0.0201

0.024

0.020

25

0.0209

0.0247

0.0179

   

26

0.0179

0.0217

0.0159

0.019

0.0159

27

0.0164

0.0202

0.0142

 

0.0135

28

0.0149

0.0187

0.0126

 

0.0126

29

0.0135

0.0172

0.0113

   

30

0.0120

0.0157

0.0100

 

0.010

31

0.0105

0.0142

0.0089

   

32

0.0097

0.0134

0.0080

   

33

0.0090

 

0.0071

   

34

0.0082

 

0.0063

   

35

0.0075

 

0.0056

   

36

0.0067

     

0.005

37

0.0064

       

38

0.0060

       

 

 

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