What Is Proportion Calculator?

The Proportion Calculator helps solve problems involving direct or cross multiplication proportions. In a proportion of the form a : b = c : d, if any one of the four values (a, b, c, or d) is unknown, you can leave it blank and the calculator will compute it for you. This is useful for solving ratio problems, scaling quantities, or converting measurements accurately.

How to Use:

1. Enter Known Values: Fill in three of the four values in the proportion a : b = c : d.
2. Leave One Value Blank: Leave the value you want to find empty.
3. Click “Calculate”: The calculator will solve for the missing value using the formula (missing value) = (product of the other two) ÷ (remaining value).
4. Interpret the Result: Use the output to solve math exercises, word problems, or practical ratio calculations.