What is the thickness of 16 gauge in inches or millimeters?

• A. 1/4 in or 6 mm
• B. 1/8 in or 3.4 mm
• C. 1/16 in or 1.5 mm
• D. 1/32 in or 0.8 mm

Answer: (C)

Gauge thickness maps to approximate actual thickness. For common steel, 16 gauge is about 0.059 to 0.0625 inches, which is roughly 1.5 mm. The closest match among typical options is 1/16 inch, about 0.0625 inch or ~1.5 mm. The other sizes are noticeably thicker or thinner than 16 gauge (for example, 1/8 inch is around 3.4 mm, and 1/32 inch is about 0.8 mm), so they don’t align with the 16-gauge standard.