Enter a measurement in Decimal Inches and choose your Round to Nearest precision to get an exact Fraction Result — plus the equivalent in Millimeters and Feet and Inches. You can also add, subtract, multiply, or divide inch values using the Operation field and a Second Value or Multiplication/Division Factor.
Fraction Result
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Decimal Inches
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Millimeters
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Feet and Inches
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To convert decimal inches to fractions, multiply the decimal by your desired denominator (like 16 for sixteenths), round to the nearest whole number, then express as a fraction. For example, 2.625 × 16 = 42, so 2.625" = 2 10/16" = 2 5/8".
For most carpentry and woodworking projects, 1/16" precision is standard. Use 1/32" or 1/64" for fine furniture work or precise joinery. Use 1/8" or 1/4" for rough framing or general construction.
Convert both measurements to the same denominator, add or subtract the numerators, then simplify. Alternatively, convert to decimals, perform the operation, then convert back to fractions using this calculator.
An inch fraction represents parts of an inch using fractions like 1/2", 3/4", 5/16", etc. These are commonly used in construction, carpentry, and machining where precise measurements are needed.
Tape measures show fractions as marks between inch numbers. The longest marks are 1/2", medium marks are 1/4" and 3/4", shorter marks are eighths, and the smallest marks are sixteenths.
Yes, you can multiply inch fractions by factors (like doubling a measurement) or divide them (like splitting a board into equal parts). This calculator handles these operations and converts results back to proper fractions.
The U.S. continues to use the imperial system (including inches) for historical reasons and because of the massive cost to convert existing infrastructure, tools, and industry standards to metric measurements.