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CalculatorsCálculos rápidosNew

Rule of three online

Solve simple rule-of-three problems instantly.

  • Calculate proportions and equivalences.
  • Adjust quantities in a recipe or mix.
  • Scale prices, times or measurements.

Free and private Calculated in your browser

If A corresponds to B, then C corresponds to X.

Fill in the fields to see the result.

How to use this calculator

  1. 1

    Enter A and B

    The first pair of values that correspond to each other.

  2. 2

    Enter C

    The value whose match you want to find.

  3. 3

    Copy the result

    It computes X = B × C / A.

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