Inches to Fraction Converter
Convert decimal or fractional inches into rounded fractions, feet and inches, and metric units.
Accepts decimals, simple fractions, and mixed fractions.
Choose how finely the inch fraction should be rounded.
Or convert from another unit
If both fields have values, the field you edited most recently is used.
Results
Calculated using the selected fraction precision.
The fraction result is rounded to the nearest selected denominator, so it may differ slightly from the exact decimal value.
Use this Inches to Fraction Calculator to convert decimal inches into practical fractional inches. You can choose rounding precision from 1/2 to 1/64 inch and also convert between inches, feet, millimeters, centimeters, and meters.
Calculation Method
To convert the decimal part of an inch into a fraction:
Numerator = round(decimal part × selected denominator)
The resulting fraction is then simplified.
Standard length conversions include:
1 inch = 25.4 mm exactly
1 foot = 12 inches
Example
Convert 5.375 inches using 1/16-inch precision.
The decimal part is:
0.375 × 16 = 6
6/16 = 3/8
Therefore:
5.375 inches = 5 3/8 inches
Important Note
Fractional results are rounded to the selected precision. For precise machining, engineering, or construction tolerances, use the exact decimal measurement and appropriate calibrated tools.