Fraction to Decimal Converter
A fraction is just a division waiting to happen: 3/8 is 3 ÷ 8 = 0.375. Going back, a decimal becomes the nearest fraction with a sensible denominator (this tool searches up to 64ths). Most people need this for imperial measurements – rulers, spanners, drill bits – which are all in halves, quarters, eighths and sixteenths.
Inch fractions as decimals
| Fraction | Decimal | Fraction | Decimal |
|---|---|---|---|
| 1/16 | 0.0625 | 9/16 | 0.5625 |
| 1/8 | 0.125 | 5/8 | 0.625 |
| 3/16 | 0.1875 | 3/4 | 0.75 |
| 1/4 | 0.25 | 7/8 | 0.875 |
| 3/8 | 0.375 | 15/16 | 0.9375 |
| 1/2 | 0.5 | 1 | 1.0 |
A 12-inch ruler divides each inch into 16ths, so its smallest mark is 0.0625 in.
Repeating decimals and rounding
Some fractions do not land cleanly: 1/3 is 0.333…, 1/7 is 0.142857 repeating. The converter rounds the display to six places, and when you convert back it picks the closest fraction up to 64ths – so 0.333 returns as 1/3, not 333/1000. For measurements, round to the nearest available tool mark rather than carrying six decimals you cannot cut to.
Where this fits
Pair this with the mm to inches converter when a drawing is metric but your tools are imperial: convert to a decimal inch, then read off the nearest fraction here. For scaling a recipe up or down by a fractional amount, the percentage calculator is the cleaner route.
FAQ
How do I convert a fraction to a decimal?
Divide the top number by the bottom number. 3/8 is 3 ÷ 8 = 0.375.
How do I convert 0.625 to a fraction?
0.625 is 625/1000, which reduces to 5/8.
What is a mixed number?
A whole number plus a fraction, such as 1 3/4. It equals 1 + 0.75 = 1.75.
Why does 1/3 show as 0.333333?
1 ÷ 3 repeats forever. The tool rounds to six places for display and recognises it as 1/3 when converting back.
What is 5/8 as a decimal?
0.625.