Math Calculator
Ratio Calculator
Simplify ratios and solve missing values in equivalent ratios.
⚠️ Please enter two valid positive numbers.
Simplified Ratio
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⚠️ Please enter valid positive values for A, B, and C.
Missing Value
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Calculator guide
How this calculator works
How to use this calculator
Enter two numbers to simplify a ratio, or use the equivalent ratio solver to find a missing value in A : B = C : ?.
Formula used
To simplify a ratio, both sides are divided by their greatest common divisor. To solve A : B = C : X, use X = B × C ÷ A.
Example calculation
12 : 18 simplifies to 2 : 3. For 2 : 3 = 10 : X, X = 15.
What the result means
The simplified ratio shows the same relationship in the smallest whole-number form.
Frequently asked questions
Can ratios include decimals?
Yes. Decimals are scaled before simplifying.
Can ratios be negative?
This calculator is designed for positive ratios.
What is an equivalent ratio?
Equivalent ratios describe the same relationship using different numbers.