Standard US Sheetmetal Gage Sizes

This listing applies only to steel for the moment. I will update it to include aluminum gage sizes at a later date, but hardly anyone uses that anyways...

Hot and Cold Rolled Sheet (Steel)

Gauge Number

Decimal Equivalent

Tolerance

4

.224

.216

.230

5

.209

.201

.216

6

.194

.186

.203

7

.179

.171

.186

8

.164

.157

.171

9

.149

.142

.157

10

.134

.127

.142

11

.120

.112

.127

12

.105

.097

.112

13

.090

.082

.097

14

.075

.071

.082

15

.067

.063

.071

16

.060

.056

.062

17

.054

.050

.056

18

.048

.044

.050

19

.042

.038

.044

20

.036

.034

.038

21

.033

.031

.034

22

.030

.028

.031

23

.027

.025

.028

24

.024

.022

.025

25

.021

.019

.022

26

.018

.017

.019

27

.016

.015

.017

28

.015

.014

.015

29

.014

.012

.014

Galvanized Sheet

Gauge Number

Decimal Equivalent

Tolerance Range

8

.168

.159

.177

9

.153

.142

.162

10

.138

.129

.147

11

.123

.114

.132

12

.108

.099

.117

13

.093

.085

.101

14

.079

.071

.087

15

.071

.065

.077

16

.064

.057

.069

17

.058

.052

.063

18

.052

.046

.057

19

.046

.039

.051

20

.040

.035

.044

21

.037

.032

.041

22

.034

.029

.038

23

.031

.026

.035

24

.028

.023

.032

25

.025

.020

.029

26

.022

.018

.025

27

.020

.017

.023

28

.019

.015

.022

29

.017

.014

.020

30

.016

.012

.019

Stainless Sheet

Gauge Number

Decimal Equivalent

Tolerance Range

7

.1874

8

.1650

10

.1350

11

.1200

12

.1054

13

.0900

14

.0751

16

.0595

18

.0480

19

.0420

20

.0355

22

.0293

24

.0235

26

.0178

28

.0151