Gauge chart
12 gauge steel thickness
12 gauge steel is 0.1046 inches thick, which is 2.66 mm. One square foot weighs 4.27 pounds.
12 gauge in figures
Inches 0.1046in
Millimetres 2.66mm
Weight 4.27lb/ft²
4×8 sheet 137lb
Close to 7/64 inch (0.1094). In practice, a little over three thirty-seconds of an inch.
| Material | Inches | mm | lb/ft² | Standard |
|---|---|---|---|---|
| Steel | 0.1046 | 2.66 | 4.27 | Manufacturers' Standard Gauge (MSG) |
| Galvanized | 0.1084 | 2.75 | 4.43 | MSG plus G90 zinc coating |
| Stainless | 0.1094 | 2.78 | 4.55 | Manufacturers' standard for stainless sheet |
| Aluminium | 0.0808 | 2.05 | 1.13 | Brown & Sharpe (AWG) |
What 12 gauge steel is used for
Structural sheet: shelving, racking, machine frames, security panels and heavy enclosures.
Common questions
How thick is 12 gauge steel?
- 12 gauge steel is 0.1046 inches thick, which is 2.66 mm. One square foot weighs 4.27 pounds. For reference that is a little over three thirty-seconds of an inch. Thicknesses are nominal and mill tolerance applies, so measure the sheet for anything structural.
What is 12 gauge steel in mm?
- 2.66 mm. The conversion is exact: 0.1046 inches times 25.4 gives 2.657 mm, rounded to 2.66.
Is 12 gauge stainless the same thickness as 12 gauge steel?
- No. 12 gauge galvanized is 0.1084 inches, stainless is 0.1094 inches, aluminium is 0.0808 inches, against 0.1046 inches for uncoated steel. Each material is tabulated under a different standard, so the gauge number alone does not give a thickness.
What does a 4x8 sheet of 12 gauge steel weigh?
- About 137 pounds. A 4 foot by 8 foot sheet is 32 square feet and 12 gauge weighs 4.27 pounds per square foot, so 32 times 4.27 is 136.7 pounds.