Inches to Fraction Converter
Convert decimal inches to the nearest fraction on a tape measure (1/8, 1/16, 1/32 or 1/64 inch).
About the Inches to Fraction Converter
Enter a measurement in decimal inches and choose the precision you can read on your tape. The calculator gives the nearest fraction, how far off it is in millimetres, the metric length, and the answer at every other precision.
Plans and calculators often give decimals like 2.3125 in, while tape measures show fractions. Multiply the decimal part by 16 (or 8, 32, 64), round to a whole number, and simplify.
The formula
fraction = round(decimal × denominator) ÷ denominator
Worked example
2.3125 inches to the nearest 1/16
- 0.3125 × 16 = 5
- 2.3125 in = 2 5/16 in, exactly
- = 58.737 mm; to the nearest 1/8 it would be 2 3/8 in
Questions people ask
What is 0.75 inch?
3/4 inch.
What is 0.1 inch?
About 3/32 inch (or 1/8 to the nearest eighth).
Which precision should I use?
1/16 for carpentry, 1/32 or 1/64 for fine woodworking and machining.