Mm to Inch Converter

Common Steel Plate Thicknesses

Engineering drawings often specify plate thickness in fractions (e.g., 3/8″). Use this reference table to find the exact decimal and metric (mm) equivalents.

The Formula

Inch = Millimeters ÷ 25.4

Fraction	Decimal	Metric (mm)
1/8″	0.1250	3.18 mm
1/4″	0.2500	6.35 mm
3/8″	0.3750	9.53 mm
1/2″	0.5000	12.70 mm
3/4″	0.7500	19.05 mm
1″	1.0000	25.40 mm

Note: For pipe schedules or non-standard dimensions, please contact our sales team.

Often asked about

What is the exact conversion factor?

1 Inch is exactly defined as 25.4 millimeters. To go from mm to inches, divide by 25.4. To go from inches to mm, multiply by 25.4.
Do you stock imperial thickness plates?

Yes, our inventory includes plates in standard inch increments (e.g., 0.5″, 1.0″, 2.0″) as well as standard metric thicknesses.
What is gauge thickness?

Gauge is an older system for thinner sheets (e.g., 10 Gauge ≈ 3.4mm). For heavy industry and structural steel, we primarily work with direct mm or inch measurements.

Thomas Refstad

Export Sales Director

+47 908 63 858 thomas.refstad@sverdrupsteel.com

Common Steel Plate Thicknesses

Often asked about

What is the exact conversion factor?

Do you stock imperial thickness plates?

What is gauge thickness?

Thomas Refstad