A ratio compares two values. A ratio calculator helps reduce two numbers into their simplest comparison.
Use the calculator first, then read the guide below to understand the formula and examples.
Direct answer
To use a ratio calculator, enter the two values you want to compare. The calculator finds the greatest common factor and divides both numbers by it.
Formula idea
Simplified ratio = first value ÷ common factor : second value ÷ common factor.
Example
If the values are 20 and 30, the greatest common factor is 10. Divide both values by 10 and the simplified ratio becomes 2:3.
Where ratios are used
Ratios are used in recipes, maps, design, finance, classrooms, mixtures, comparisons, and scaling measurements.
Common mistake
Do not treat a ratio as a percentage unless the question asks for a percentage. A ratio compares parts directly, while a percentage compares a value to 100.
FAQs
What does 2:3 mean?
It means the first value has 2 parts while the second value has 3 parts.
Can a ratio use decimals?
Ratios can start with decimals, but simplified ratios are usually shown as whole numbers when possible.
Is 20:30 the same as 2:3?
Yes. 20:30 simplifies to 2:3.