Free Ratio Calculator
Solve A:B = C:D for the missing term.
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Inputs
Result
D
12.0000
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Short answer
Solve A:B = C:D for the missing term.
What is the Ratio Calculator?
Solve A:B = C:D for the missing term.
How does the Ratio Calculator work?
Enter the inputs above and read the result.
Formula
Variables
Explanation
Cross-multiplication of two equal ratios.
Examples
Applications
Advantages
Limitations
Common mistakes
Tips
Related concepts
The Ratio Calculator sits inside the Math Calculators hub, in the algebra & equations cluster. Solving for unknowns and manipulating expressions. Understanding the terms below makes the output easier to interpret and easier to compare against neighbouring measures.
Practical use cases and industry applications
Understanding Ratio
Solve A:B = C:D for the missing term. Within math calculators, ratio belongs to the algebra & equations cluster, where it shares terminology and assumptions with closely related tools.
Learning how ratio is calculated
Cross-multiplication of two equal ratios. Working through the variables one at a time — — makes the result reproducible by hand and easier to sanity-check.
Using ratio to make a decision
Because outputs depend on the assumptions you enter, run more than one scenario before committing to a figure.
How ratio compares with related measures
equation, root, exponent, logarithm all describe adjacent aspects of algebra & equations. Comparing this calculator's output against those measures — using the related tools listed on this page — prevents a single metric from being read in isolation.
Frequently asked questions
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