Ratio Calculator
Simplify a ratio to lowest terms, or solve for a missing value.
Ratios compare two quantities directly — a recipe, a mixing formula, a map scale — and simplifying them to lowest terms makes the underlying proportion easier to see and scale.
Simplifying vs. solving
Simplifying reduces a ratio like 8:20 down to 2:5. Solving finds a missing value when you know a ratio holds proportionally — cross-multiplication gives you the answer without needing to simplify first.
Frequently asked questions
Is a ratio the same as a fraction?
They're closely related, but ratios are typically used to compare two separate quantities, while fractions represent a part of a single whole.
How do I scale a recipe using ratios?
Keep the ratio between ingredients constant — if you double one ingredient, double all the others in the same ratio too.