27 gauge steel thickness and weight
0.0164 in · 0.42 mm · 0.670 lb/ft²
27 gauge sheet steel (Manufacturers' Standard Gauge) is 0.0164 in, or 0.42 mm, thick. It weighs 0.670 lb per square foot (3.27 kg/m²).
Weight of common sheet sizes
| Sheet | lb | kg |
|---|---|---|
| 4 × 8 ft | 21.4 | 9.7 |
| 4 × 10 ft | 26.8 | 12.2 |
| 5 × 10 ft | 33.5 | 15.2 |
| 1000 × 2000 mm | 14.4 | 6.5 |
| 1250 × 2500 mm | 22.5 | 10.2 |
| 1500 × 3000 mm | 32.4 | 14.7 |
27 gauge in other metals
| Material | Thickness (in) | Thickness (mm) | kg/m² |
|---|---|---|---|
| Sheet steel | 0.0164 | 0.42 | 3.27 |
| Galvanized steel | 0.0202 | 0.51 | 4.03 |
| Stainless steel | 0.017 | 0.43 | 3.42 |
| Aluminum | 0.014 | 0.36 | 0.96 |
Gauge numbers are tied to the material, so 27 gauge aluminum is not the same thickness as 27 gauge steel. When ordering, give the thickness in inches or millimetres.
Compared with nearby gauges
| Gauge | in | mm | lb/ft² | Thickness vs 27 ga |
|---|---|---|---|---|
| 24 gauge | 0.0239 | 0.61 | 0.976 | +46 % |
| 25 gauge | 0.0209 | 0.53 | 0.854 | +27 % |
| 26 gauge | 0.0179 | 0.45 | 0.731 | +9 % |
| 27 gauge | 0.0164 | 0.42 | 0.670 | — |
| 28 gauge | 0.0149 | 0.38 | 0.608 | −9 % |
| 29 gauge | 0.0135 | 0.34 | 0.551 | −18 % |
| 30 gauge | 0.012 | 0.30 | 0.490 | −27 % |
A lower gauge number means a thicker sheet. The steps between gauges are not equal, because the gauge system started as a measure of weight per square foot rather than of thickness.
Metric and fractional equivalents
Outside the US, sheet is ordered in millimetres. The nearest standard metric thickness to 27 gauge (0.42 mm) is 0.5 mm, which weighs 3.93 kg/m². If a drawing calls for 27 gauge and you buy metric sheet, check whether the small difference in thickness matters for bending, welding or fit.
Weight of strips
Weight per running foot of a 27 gauge strip, for sheared blanks and formed parts.
| Strip width | lb per foot of length |
|---|---|
| 6 in | 0.33 |
| 12 in | 0.67 |
| 24 in | 1.34 |
| 36 in | 2.01 |
| 48 in | 2.68 |
Where 27 gauge is used
Thin gauges like this are used for HVAC duct, roofing and wall cladding, flashing, and light formed parts. Thickness tolerances for cold-rolled and hot-rolled sheet are set by ASTM A568 and depend on width, so the measured thickness can be a few thousandths of an inch off the nominal gauge value.
Frequently asked questions
How thick is 27 gauge steel in mm?
27 gauge sheet steel is 0.42 mm (0.0164 in). The nearest standard metric sheet is 0.5 mm.
How much does a 4 × 8 sheet of 27 gauge steel weigh?
About 21.4 lb (9.7 kg): 0.670 lb/ft² × 32 ft².
Is 27 gauge thicker than 28 gauge?
Yes. A lower gauge number is thicker: 27 gauge is 0.0164 in, 28 gauge is 0.0149 in, and 26 gauge is 0.0179 in.
How thick is 27 gauge galvanized steel?
0.0202 in (0.51 mm), slightly more than plain 27 gauge because the gauge includes the zinc coating.
Is 27 gauge aluminum the same thickness as steel?
No. 27 gauge aluminum is 0.014 in (0.36 mm); aluminum uses a different gauge table.
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Data adapted from Wikipedia, "Sheet metal" (CC BY-SA 4.0).