Sheet metal thickness chart: 7, 10, 11, 12, 14, 16, 18, 20 gauge steel

We use steel in several aspects of life. We use metal to build roofs, equipment, machines, computers, hinges, door locks, and many more. Almost everything around us these days has its part of its component. For example, a high-rise building uses metal for its internal structure. Our smartphones take advantage of metal for their internal and external casing. The chassis of our vehicles leverage steel for a more robust frame.

Here’s a tool that makes it easy for you to figure out what you have rather than having to consult a chart. Otherwise, scroll down to check out the chart.

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Everywhere we look, we see it as a part of our life. However, it does not simply come in one type. Different applications require different thicknesses, which we refer to as metal gauges. A high-rise building requires a thicker sheet than a one-story house. Your vehicle’s chassis would need a thinner sheet than a metro station.

In the following sections, we will tackle the different varieties of metal sheets, together with a chart for a clearer understanding.

What does gauge mean in steel?

A sheet metal gauge, or simply a metal gauge, refers to the thickness of a specific material, which is steel in this case. The standard system expresses it in numbers, where a higher number means a thinner material, and a lower number means a thicker one.

sheet metal

Its weight is 41.82 lbs per square foot per inch of thickness, which we use to express weight per square foot. It is a standard value for the sheet metal gauge chart, which is different for brass and aluminum. For example, an eight sheet has a thickness of 0.1644 inches. Its weight will be 41.82 * 0.1644 inches = 6.875 lbs per square foot.

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In the United States, they use inches and feet to measure. For sheet metal thickness, they use the gauge, which is a dimensionless number. Larger numbers denote a thinner sheet, while smaller numbers denote a thicker sheet.

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metal sheet

What steel gauge is thicker – 10, 11, 12, 14, 16, or 18? 

Most people would think a higher number means a thicker material. However, it does not hold with steel gauge thickness. Amp wires come in different sizes too, which is comparable with steel.

From 10 to 18, the thickest is the 10, and the thinnest is the 18. If we look at the measurements, the increments are minimal. For example, a size ten standard steel is 0.1345 inches, while a size 11 is 0.1196 inches. It does not imply there is not much difference in its strength. The former is significantly more durable than the latter despite a very minimal thickness increase.

The following section shows a table of all the measurements you need. The weight per area is also available for your convenience.

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Sheet Metal Thickness Chart

The table below shows the thicknesses of different metal sheets. We have these in millimeters and inches, so you do not have to convert from gauge to mm or to inches.

Moreover, you don’t have to spend time searching the internet about how thick is an 8-gauge because we have all the information you need in the chart below. If there is a need to make conversions, we recommend checking this article about SAE to the metric conversion size chart

Standard Steel


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

Stainless Steel


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

Galvanized Steel


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

However, we must note that the thickness may change according to the steel type. For example, a size three in standard steel is 0.2391 inches thick, while a three in stainless steel is 0.2500 inches. The difference is minimal but could make or break it in actual application. Another example is between the size 38 standard and stainless steel. The former is 0.0060 inches thick, while the latter is 0.0062 inches. Again, the difference is very minimal. 

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Types

There are several metal gauge types in the market, which gets confusing. The following should give you a rough idea of where each one is ideal to use, such as residential buildings, commercial spaces, repair shops, condominiums, and many more.

These are not the only available ones because there are so many options in the market. These are the ones that are common and sell out faster than the rest.

We thought it would be more convenient for customers to get more information on the types, particularly in the application.

24-gauge

The 24 is common for use in buildings that experience snow loads or high winds and standing seam panels. We also use it for residential roofing.

22-gauge

We use the size 22 for metal roofing. It runs on the thinner side of sheet metals, so expect it to be lighter. We also use the same for steel chairs and desks. 

20-gauge

The size 20 is common in flutter spoon and metal case manufacturing. If you wish to drill a hole at the center of it, we recommend using a carbide bit.

We also use the 20-gauge for oversize caskets because it is much lighter than a 22. 

18-gauge

We use the size for regular casket sizes. Despite its heftier weight than the 20, we recommend using it because of its smaller dimensions in a not oversize casket. 

16-gauge

Our recommendation for the 16 is for light to medium-duty projects. You can use it for your desk and table projects at home. The kitchen sink is another home application for this option. 

14-gauge

The 14-gauge is likely the global standard for frame thickness for metal structures and carports. Although several people compare the 12 with the 14, you must know when to use one over the other.

Some manufacturers interchangeably use the two, depending on the availability. Before making any decisions, we recommend confirming the requirements. 

12-gauge

The 12 typically stands out in applications such as base rail anchor of a building, overhead rafters, vertical uprights, window frames, door frames, walkways, and cutouts. Manufacturers also use a 12 for steel during manufacturing.

Moreover, you should also see the 12 in storage buildings, retail stores, parking garages, auto repair shops, and workshops. 

11-gauge

The 11-gauge is about 1.45 times stronger than its size 12 sibling. However, their practical applications are similar. We also recommend using it for window frames, walkways, cutouts, door frames, parking garages, workshops, and retail stores. 

10-gauge

The 10-gauge works best on more heavy-duty applications, such as blower systems, industrial systems, ventilation systems, and many more. 

8-gauge

The 8-gauge is similar to the 10 in terms of application. We can use it for heavy-duty systems. 

7-auge

The 7-gauge is the thickest among the thicknesses listed in this section. We recommend using a 7 for any heavy-duty project, such as tall buildings and industrial systems. Manufacturers also use a 7 for oversize tables, desks, and cabinets. However, the trade-off is weight, which is significantly more. 

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How do I find out my gauge size for sheet metal?

  1. Lay the sheet metal on a leveled surface to reduce the error in readings.

  2. Use a tape measure to measure the sheet metal’s thickness.

    Use mm for maximum accuracy.

  3. Convert the value in mm to inches by multiplying it by 0.03937.

  4. Use a sheet metal gauge chart to find the number representing your sheet’s thickness.

    For instance, a 1/20” thickness is represented by an 18 reading.

FAQ

How strong is 12-gauge steel?

We use the 12-gauge steel for storage buildings, workshops, manufacturing plants, retail stores, parking garages, and many more. It provides a ton of support, making it one of the common choices for short buildings. 

Is 11 gauge steel strong?

A size 11 has more strength than a 12. It is 1.45 times stronger than the latter.
There are several options for the steel sheet gauges. You must know your project’s requirements before choosing the size that works best. 

How thick is 7, 10, 11, & 12 gauge steel?

In standard steel, gauge 7 has a thickness of 4.554mm. Gauge 10 has a thickness of 3.416mm. Gauge 11 has a thickness of 3.308 mm, while gauges 11 & 12 have thicknesses of 3.038mm & 2.657mm.