Ratio Calculator
Solve proportions A:B = C:D by entering any three values to find the fourth. Shows simplified ratio.
How to Use Ratio Calculator
The Ratio Calculator is a free online tool that solves proportions of the form A:B = C:D. Enter any three of the four values and the calculator finds the missing one using cross-multiplication. It also shows the simplified ratio and the formula used. Whether you are scaling recipes, calculating map distances, solving math problems, determining proportional dimensions for design, or working with any ratio relationships, this tool provides instant accurate results with the work shown.
Step-by-Step Instructions
- Enter three of the four values (A, B, C, D)
- Leave one field empty — that is the value to solve for
- Click Solve to find the missing value
- View the result, simplified ratio, and formula
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