Ratio to Percentage 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 percentage output selected: a ratio A : B is divided out and multiplied by 100, so 3 : 4 becomes 75% and 1 : 8 becomes 12.5%. The division is exact, and repeating decimals are truncated at ten places and marked as approximate.
Each conversion also produces the simplified fraction and the plain decimal value on separate result cards, with the full working — simplification, division, multiplication by 100 — listed underneath.
Percentages make ratios comparable: a 3 : 4 win ratio and a 6 : 8 one are obviously the same once both read 75%. The converter is handy for test scores, solution concentrations, screen and sensor shapes, and any report where a plain percent communicates faster than a ratio.
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.