What is the thickness of 22 gauge in millimeters?

• A. 0.4 mm
• B. 0.8 mm
• C. 1.2 mm
• D. 2.0 mm

Answer: (B)

Gauge numbers work inversely: as the gauge increases, the metal gets thinner. For common steel sheet, 22 gauge is about 0.0299 inches, which is roughly 0.76 millimeters. In practice, that thickness is rounded to the nearest typical metric value, so 0.8 mm is the closest and most standard representation. The other options are noticeably off: 0.4 mm is much thinner (closer to higher gauge numbers), 1.2 mm is thicker (lower gauge), and 2.0 mm is even thicker still. So 0.8 mm best matches the standard 22 gauge thickness.