Stainless Steel Gauge Conversion Chart to mm - Tip sheet

Standard to metric conversion tables used in the Stainless Steel industry. The Standard Gage provides the thicknesses for standard steel, galvanized steel, and stainless steel.  Gauge sizes are numbers that indicate the thickness of a piece of metal, with a higher number referring to a thinner sheet. The equivalent thicknesses differ for each gauge size standard, which was developed based on the weight of the sheet for a given material. 

You can use the charts below to determine the equivalent thickness, in inches or millimeters, for a gauge number from the selected gauge size standard. 

The weight per unit area of the sheet can also be seen in pounds per square foot and kilograms per square meter.

The strength per square inch or Tensile Strength is shown in KSI, PSI, and Megapascal.

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Gauge Conversion

Gauge Nominal
Thickness
Min.
Thickness
Max.
Thickness
No. mm inches mm inches mm inches
10 3.43 0.135 3.28 0.129 3.58 0.141
11 3.05 0.120 2.92 0.115 3.17 0.125
12 2.67 0.105 2.54 0.100 2.77 0.109
13 2.285 0.090 2.18 0.086 2.38 0.094
14 1.9 0.075 1.8 0.071 1.98 0.078
15 1.71 0.067 1.65 0.065 1.8 0.071
16 1.52 0.060 1.44 0.057 1.6 0.063
17 1.37 0.054 1.3 0.051 1.43 0.056
18 1.22 0.048 1.14 0.045 1.27 0.05
19 1.04 0.041 0.99 0.039 1.12 0.044
20 0.892 0.035 0.84 0.033 0.96 0.038
21 0.815 0.032 0.76 0.030 0.86 0.034
22 0.74 0.029 0.69 0.027 0.79 0.031
23 0.668 0.026 0.61 0.024 0.71 0.028
24 0.61 0.024 0.56 0.022 0.64 0.025
25 0.51 0.020 0.48 0.019 0.56 0.022
26 0.455 0.018 0.41 0.016 0.49 0.019
27 0.41 0.016 0.36 0.014 0.44 0.017
28 0.385 0.015 0.35 0.013 0.41 0.016
29 0.33 0.013 0.31 0.012 0.35 0.014

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Length

Meter Millimeter Inch Feet Yard
m mm in
(“)
ft yd
1 1000 39.3700 3.2808 1.093613
0.001 1 0.03937 0.00328 0.001093
0.0254 25.4 1 0.08333 0.08777
0.3048 304.8 12 1 0.333
0.9144 914.4 36 3 1

Weight

Kilogram Ton Pound
Kg Ton Lb
1 0.001 2.2045
1000 1 2204
0.4536 0.000453 1

Tensile Strength

Pound/Square Inch 1000 Pound/Square Inch Megapascal
PSI KSI Mpa
1 0.001 0.006895
1000 1 6.895
145.0326 0.1450326 1

 

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