Aluminum Thickness Converter

Convert a thickness value between millimeters and inches. Gauge numbers are not a universal unit: gauge-to-thickness relationships can vary by material type and standard, so this page does not infer gauge from a single universal chart.

Conversion factors

• 1 inch = 25.4 millimeters.
• Inches = millimeters ÷ 25.4.
• Millimeters = inches × 25.4.

Ordering reminder

For aluminum sheet and foil, state the required thickness in a defined unit and include the applicable product standard and tolerance. If a drawing uses gauge, confirm the gauge system and its corresponding nominal thickness before ordering.