Gauge chart
20 gauge steel thickness
20 gauge steel is 0.0359 inches thick, which is 0.91 mm. One square foot weighs 1.47 pounds.
20 gauge in figures
Inches 0.0359in
Millimetres 0.91mm
Weight 1.47lb/ft²
4×8 sheet 47lb
Close to 1/32 inch (0.0313). In practice, about a thirty-second of an inch.
| Material | Inches | mm | lb/ft² | Standard |
|---|---|---|---|---|
| Steel | 0.0359 | 0.91 | 1.47 | Manufacturers' Standard Gauge (MSG) |
| Galvanized | 0.0396 | 1.01 | 1.62 | MSG plus G90 zinc coating |
| Stainless | 0.0375 | 0.95 | 1.56 | Manufacturers' standard for stainless sheet |
| Aluminium | 0.0320 | 0.81 | 0.45 | Brown & Sharpe (AWG) |
What 20 gauge steel is used for
Light ductwork, flashing, drip edge, decorative panels and general sheet metal work.
Common questions
How thick is 20 gauge steel?
- 20 gauge steel is 0.0359 inches thick, which is 0.91 mm. One square foot weighs 1.47 pounds. For reference that is about a thirty-second of an inch. Thicknesses are nominal and mill tolerance applies, so measure the sheet for anything structural.
What is 20 gauge steel in mm?
- 0.91 mm. The conversion is exact: 0.0359 inches times 25.4 gives 0.912 mm, rounded to 0.91.
Is 20 gauge stainless the same thickness as 20 gauge steel?
- No. 20 gauge galvanized is 0.0396 inches, stainless is 0.0375 inches, aluminium is 0.0320 inches, against 0.0359 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 20 gauge steel weigh?
- About 47 pounds. A 4 foot by 8 foot sheet is 32 square feet and 20 gauge weighs 1.47 pounds per square foot, so 32 times 1.47 is 46.9 pounds.