Ratio Calculator
Calculate ratios, simplify ratios, and find missing values in proportions.
Published by:
isCalculator Editorial Team
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Review Board
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How to use this tool?
This calculator has two modes: Simplify Ratio and Find Missing Value. Select your mode from the dropdown at the top.
Simplify Ratio
- Enter two positive numbers (e.g., 8 and 12).
- Click Calculate.
- The result shows the ratio reduced to its simplest form (e.g., 2:3).
Find Missing Value
- Fill in exactly three of the four fields (A, B, C, D). Leave the missing one blank.
- All values must be positive numbers.
- Click Calculate.
- The calculator finds the missing value using cross-multiplication (e.g., A:B = C:D).
Note: The calculator works with any positive numbers (integers or decimals). No specific units are required—just enter the numbers as they are.
Previous Results
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Frequently Asked Questions
A ratio is a comparison between two or more numbers indicating their relative sizes.
Divide both numbers by their greatest common divisor (GCD).
Cross-multiply and solve for the unknown. For A:B = C:D, if A is unknown, A = (B*C)/D.
