Fraction to Decimal Inches Converter
Convert a fraction of an inch (like 5/8") to its decimal equivalent, or use the 16ths reference table below.
Fraction to decimal inches
Tape measures, rulers, and most US lumber dimensions are marked in fractions of an inch -- typically down to 1/16 in, sometimes 1/32 or 1/64 for precision work. Calculators, spreadsheets, and many digital tools need that same measurement as a plain decimal number instead.
The conversion is simple division: a fraction like 5/8 becomes 0.625 by dividing 5 by 8. This page does that instantly, or use the reference table below for the most common sixteenths.
Where these numbers come from
Simple arithmetic -- numerator divided by denominator. This page was not separately keyword-researched; it was added for completeness alongside the other converters.
| Fraction | Decimal |
|---|---|
| 1/16" | 0.0625" |
| 1/8" | 0.125" |
| 3/16" | 0.1875" |
| 1/4" | 0.25" |
| 5/16" | 0.3125" |
| 3/8" | 0.375" |
| 7/16" | 0.4375" |
| 1/2" | 0.5" |
| 9/16" | 0.5625" |
| 5/8" | 0.625" |
| 11/16" | 0.6875" |
| 3/4" | 0.75" |
| 13/16" | 0.8125" |
| 7/8" | 0.875" |
| 15/16" | 0.9375" |
| 1" | 1.0" |
Frequently asked questions
Why do tape measures use fractions instead of decimals?
It's a long-standing trade convention -- fractions of an inch (down to 1/16 or 1/32) are how tape measures, rulers and most US lumber and hardware are marked, so trades read and communicate in fractions rather than decimals.
When would I need the decimal version instead?
Mainly for calculators, spreadsheets, and CNC or digital tools that require a plain number input rather than a fraction -- this page bridges that gap.
Is this the same as feet-and-inches to decimal feet?
No, that's a different conversion (mixed feet/inches to a decimal feet value) -- this page converts a fraction of an inch to its decimal-inch equivalent.
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