Fraction to Decimal Converter
Convert fractions to decimals, decimals to fractions, and check common construction marks without leaving the page. This version is built to work as both a fast converter and a reference chart for tape-measure math, cut lists, and spreadsheet inputs.
Use this page for a fast bridge number or sanity check, then continue into the related calculators or guides below when the decision needs more than a raw conversion.
Fraction to decimal
Best for plan measurements, cut lists, and calculator fields that need decimal inches.
Common construction picks
Decimal to fraction
Use this when a drawing, product spec, or spreadsheet gives you decimal inches.
Fractions reduce automatically, and repeating decimals are labeled so rounded outputs do not look exact when they are not.
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Calculate →Fraction to Decimal Formula
To convert a fraction to a decimal, divide the numerator by the denominator. That is the whole job: 5/8 becomes 5 divided by 8, which equals 0.625.
Decimal = Numerator ÷ Denominator
Going the other direction means taking the digits after the decimal point, placing them over the matching power of 10, and simplifying. For example, 0.375 = 375/1000 = 3/8.
Common Fraction Chart
These are the fractions people reach for most often in calculators, spreadsheets, recipes, and measurement work. Thirds, fifths, tenths, and twelfths matter because they often create repeating decimals that are easy to mis-key if you do the division in your head.
| Fraction | Decimal | Fraction | Decimal |
|---|---|---|---|
| 1/2 | 0.5 | 1/3 | 0.333333 |
| 2/3 | 0.666667 | 1/4 | 0.25 |
| 3/4 | 0.75 | 1/5 | 0.2 |
| 2/5 | 0.4 | 3/5 | 0.6 |
| 4/5 | 0.8 | 1/6 | 0.166667 |
| 5/6 | 0.833333 | 1/8 | 0.125 |
| 3/8 | 0.375 | 5/8 | 0.625 |
| 7/8 | 0.875 | 1/10 | 0.1 |
| 3/10 | 0.3 | 7/10 | 0.7 |
| 9/10 | 0.9 | 1/12 | 0.083333 |
| 5/12 | 0.416667 | 7/12 | 0.583333 |
| 11/12 | 0.916667 | 1/16 | 0.0625 |
| 3/16 | 0.1875 | 5/16 | 0.3125 |
| 7/16 | 0.4375 | 9/16 | 0.5625 |
| 11/16 | 0.6875 | 13/16 | 0.8125 |
| 15/16 | 0.9375 |
Construction Fraction Chart to 1/64 Inch
When plans, hardware specs, or shop notes move past eighths and sixteenths, people often need the decimal for a 64ths mark right away. That is especially common when you are feeding a measurement into a calculator that only accepts decimals. Even 64ths reduce automatically, so 16/64 is the same as 1/4 and 40/64 is the same as 5/8.
| 64ths Mark | Decimal | 64ths Mark | Decimal |
|---|---|---|---|
| 1/64 | 0.015625 | 2/64 = 1/32 | 0.03125 |
| 3/64 | 0.046875 | 4/64 = 1/16 | 0.0625 |
| 5/64 | 0.078125 | 6/64 = 3/32 | 0.09375 |
| 7/64 | 0.109375 | 8/64 = 1/8 | 0.125 |
| 9/64 | 0.140625 | 10/64 = 5/32 | 0.15625 |
| 11/64 | 0.171875 | 12/64 = 3/16 | 0.1875 |
| 13/64 | 0.203125 | 14/64 = 7/32 | 0.21875 |
| 15/64 | 0.234375 | 16/64 = 1/4 | 0.25 |
| 17/64 | 0.265625 | 18/64 = 9/32 | 0.28125 |
| 19/64 | 0.296875 | 20/64 = 5/16 | 0.3125 |
| 21/64 | 0.328125 | 22/64 = 11/32 | 0.34375 |
| 23/64 | 0.359375 | 24/64 = 3/8 | 0.375 |
| 25/64 | 0.390625 | 26/64 = 13/32 | 0.40625 |
| 27/64 | 0.421875 | 28/64 = 7/16 | 0.4375 |
| 29/64 | 0.453125 | 30/64 = 15/32 | 0.46875 |
| 31/64 | 0.484375 | 32/64 = 1/2 | 0.5 |
| 33/64 | 0.515625 | 34/64 = 17/32 | 0.53125 |
| 35/64 | 0.546875 | 36/64 = 9/16 | 0.5625 |
| 37/64 | 0.578125 | 38/64 = 19/32 | 0.59375 |
| 39/64 | 0.609375 | 40/64 = 5/8 | 0.625 |
| 41/64 | 0.640625 | 42/64 = 21/32 | 0.65625 |
| 43/64 | 0.671875 | 44/64 = 11/16 | 0.6875 |
| 45/64 | 0.703125 | 46/64 = 23/32 | 0.71875 |
| 47/64 | 0.734375 | 48/64 = 3/4 | 0.75 |
| 49/64 | 0.765625 | 50/64 = 25/32 | 0.78125 |
| 51/64 | 0.796875 | 52/64 = 13/16 | 0.8125 |
| 53/64 | 0.828125 | 54/64 = 27/32 | 0.84375 |
| 55/64 | 0.859375 | 56/64 = 7/8 | 0.875 |
| 57/64 | 0.890625 | 58/64 = 29/32 | 0.90625 |
| 59/64 | 0.921875 | 60/64 = 15/16 | 0.9375 |
| 61/64 | 0.953125 | 62/64 = 31/32 | 0.96875 |
| 63/64 | 0.984375 |
Repeating Decimals vs. Exact Tape-Measure Decimals
Fractions built from powers of 2 and 5 terminate cleanly in decimal form, which is why many tape-measure fractions are exact decimals: 1/8 = 0.125, 3/16 = 0.1875, and 21/64 = 0.328125. By contrast, fractions like 1/3, 2/3, and 5/12 repeat forever. When you see a repeating result, treat the decimal as a rounded working number rather than a perfect endpoint.
Where This Page Helps Most
The high-frequency use cases are simple: entering fractional inches into a takeoff sheet, translating a decimal back into a shop-friendly fraction, or checking a measurement from a plan or product spec. If your next step is a larger project estimate, the related tools above route into the existing measurement and lumber workflow instead of stopping at the raw conversion.