Free ratio & proportion calculators
Simplify a ratio, solve a missing value, find equivalent ratios or divide a total fairly. Four free tools with exact decimal reduction, clear formulas and worked examples.
Reduce whole-number or decimal ratios to their simplest integer form and see each part’s share of the total.
Open calculator →Solve a missing value anywhere in A:B = C:D using exact cross multiplication.
Open calculator →Scale both sides of a ratio by the same factor and check the reduced form.
Open calculator →Split a quantity into two shares according to a ratio, with exact fractions and percentages.
Open calculator →Worked example
Exact reduction; decimal displays may be rounded.
Inputs stay in this browser. Use the same units. Results update as you type.
RatioWise is a free ratio toolkit from Crushjs, built in the same family as BuildWise and CalcWise. Use it to reduce ratios, solve proportions, scale quantities and divide totals. Each tool explains its formula, assumptions and a worked example.
No. In a part-to-part ratio of 2:3, the total has five parts. The first share is 2/5 (40%) and the second is 3/5 (60%).