Feet-Inch-Fraction Calculator
Convert construction dimensions between feet-inches-fractions and metric, and round to a buildable increment.
Feet/inches/fractions, decimal, or metric (mm/cm/m). A bare number is inches.
Feet-inches12' 4-3/8"
Millimeters3768.7 mm
Centimeters376.87 cm
Meters3.769 m
Decimal feet12.365'
Decimal inches148.375"
Why a dedicated feet-inch calculator?
Most converters only accept decimals. Construction documents speak in
feet, inches, and fractions — like 12' 4-3/8" — and need
results rounded to the nearest 1/16" or 1/8". This tool parses that dialect
directly, converts cleanly to millimeters (the exact basis is 1 inch =
25.4 mm), and rounds the imperial result to the increment you choose.
Enter a value any way you like: 12' 4-3/8", 12.5',
148.375", 3810 mm, or a bare number (treated as
inches).