Ratio Calculator

Simplify ratios and solve for the missing value A:B = C:? Simplify ratios to lowest terms, find equivalent ratios and solve proportions for a missing value. Free online ratio and proportion calculator.

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À propos de Ratio Calculator

Ratios compare quantities — 16:12 simplifies to 4:3, and scaling recipes, maps and mixtures is proportion-solving. This calculator does both jobs: reduce any ratio (with up to four parts) to its simplest whole-number form, and find the missing term of a proportion like 3:4 = 15:? instantly. Equivalent ratio tables show the scaling at a glance, useful for adjusting ingredient quantities or interpreting scale drawings.

Comment utiliser Ratio Calculator

  1. Choose Simplify or Solve mode.
  2. Enter your ratio values.
  3. Read the simplified or completed ratio.
  4. Use the equivalent table to scale quantities.

Fonctionnalités clés

How do I simplify a ratio with decimals?
Multiply all terms by a power of ten to clear the decimals, then divide by the greatest common divisor — the calculator does both steps for you.
How is a ratio different from a fraction?
A fraction compares a part to a whole; a ratio compares two (or more) quantities directly. 1:2 as a ratio means "one part to two parts", not "one out of two".

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