Convert inch fractions (1 1/2, 3/4, 5/8) to decimal and millimeters, and vice versa. Accepts mixed fractions. Free.
In the imperial system, inch length measurements often use fractions instead of decimals — especially in woodworking, construction, mechanics, and tools. A 1/2" wrench, a 3/4" bolt, or a 1 1/2" board are everyday examples. Inch fractions follow denominators that are powers of 2: 1/2, 1/4, 1/8, 1/16, 1/32, and 1/64, a standard inherited from successively halving the inch. This converter accepts simple fractions (e.g., 3/4), mixed fractions (e.g., 1 1/2 or 1-1/2), and decimal values, converting between fractional inch, decimal inch, and millimeter. The relationship with the metric system uses 1 inch = 25.4 mm (exact international definition since 1959). Thus, 1/2" = 0.5" = 12.7 mm, and 3/4" = 0.75" = 19.05 mm. When converting from decimal to fraction, the result is rounded to the nearest fraction with a denominator up to 64, the standard for inch fraction tables. It is essential for woodworkers, mechanics, furniture assemblers, and anyone working with fractional inch specifications or translating measurements between imperial and metric systems.
Divide the numerator by the denominator. E.g., 3/4 = 0.75". Mixed fractions: 1 1/2 = 1.5".
1/2" = 0.5" × 25.4 = 12.7 mm.
The converter rounds to the nearest fraction with a denominator up to 64. E.g., 0.375" = 3/8".
1 inch = 25.4 mm (exact international definition since 1959).
Yes, completely free, with no registration and no usage limit.