Proportion Calculator
Enter three of four values in the ratio A / B = C / D, and our calculator will instantly find the missing one.
If all four values are entered, it will check if the proportion is correct. Perfect for solving math problems, scaling recipes, checking blueprints, or working with any kind of ratios. Fast, accurate, and easy-to-use — no formulas needed!
About the Proportion Calculator
A proportion states that two ratios are equal: A / B = C / D. This calculator helps you solve for the missing value when three values are known.
Why use Proportions?
- Quickly find missing values in ratios.
- Ensure accuracy in recipes, projects, and finances.
- Check equality of ratios in experiments or studies.
- Perfect for students learning fractions and ratios.
Proportions are widely used in math, science, finance, recipes, and everyday calculations. For example:
- Scaling recipes: If 4 cups flour : 2 cups sugar = x cups flour : 3 cups sugar → find x
- Maps and blueprints: distance on map : actual distance = measured distance : actual distance
- Mixing solutions or chemicals in a lab
How to use it:
Enter three values and leave one blank to calculate the missing value. If all four values are entered, the calculator will check if the proportion is correct.