Ratio to Fraction Converter
Simplify ratios, solve proportions A : B = C : x, scale ratios by any factor and convert them to fractions, decimals and percentages — with every step shown.
Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
This page opens the ratio calculator in convert mode with the fraction output selected: a ratio A : B is rewritten as the fraction A/B and reduced to lowest terms. So 25 : 10 becomes 5/2, and the decimal ratio 2.5 : 1 is first scaled to whole numbers and then reduced to the same 5/2.
The greatest-common-divisor step is shown explicitly, and alongside the fraction you always get the matching decimal and percentage cards — three views of the same relationship computed in one run with exact integer arithmetic.
Turning a ratio into a fraction is the standard first move in probability exercises, in comparing parts of a whole, and in converting sports odds or mixing rules into arithmetic you can actually compute with. If you then need to add or divide such fractions, the site's fraction calculator continues from here.
Example. Simplifying 8:12 yields the reduced integer ratio 2:3.
Limit. Inputs longer than 12 digits are refused, and reduction is exact integer arithmetic after the decimal is scaled away.