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Length Converter — Precision for Blueprints & Layout

Convert between imperial and metric length units with blueprint-grade accuracy. Includes common trade benchmarks for framing and MEP layout.

To convert inches to millimeters, multiply by 25.4 exactly. For feet to meters, multiply by 0.3048. In US construction, "nominal" dimensions (like a 2x4) differ from actual measurements (1.5" x 3.5"). Always verify actual dimensions before final layout.

Length Unit Converter
in · ft · yd · mm · cm · m
25.400 mm
1 in = 25.4 mm
Conversion Formula
1 × 25.4 = 25.4 mm
Quick Conversion Grid

Standard Trade Benchmarks

ApplicationImperialMetric (Approx)Notes
Standard Stud Spacing16" OC406 mmStandard wall framing
Wide Stud Spacing24" OC610 mmAdvanced framing
Standard Ceiling Height8' 0"2438 mmResidential minimum
Kitchen Counter Height36"914 mmFinished floor to top
ADA Grab Bar Height33"–36"838–914 mmAccessibility code
 Common industry layout standards for field reference.