Fraction & Decimal Converter
Convert a fraction to a decimal (and its simplest form), or convert a decimal into the closest simple fraction.
Why some fractions convert cleanly and others don't
A fraction becomes a terminating decimal only when its denominator, in lowest terms, has no prime factors other than 2 and 5 — which is why 1/4 becomes a clean 0.25 while 1/3 becomes a repeating 0.333...
A rounding trap to watch for
Repeating decimals get truncated for display, which can introduce small errors if a rounded decimal is carried into further calculations. Where precision matters, keep the fraction through multi-step math and convert to decimal only at the final step.