Ratio Calculator

Simplify ratios, solve equivalent ratios, compare values, and convert ratios to fractions and percentages with this free ratio calculator.

Calculate Ratios

12 : 18
3 : 5 = 9 : ?
2 : 3 compared to 4 : 6
Your result will appear here.

How ratios are calculated

Simplify ratio:
Divide both values by their greatest common factor

Equivalent ratio:
Use cross multiplication to solve the missing value

Compare ratio:
Convert both ratios to decimal form and compare

This calculator helps with proportions, scaling, recipes, finance, grades, and comparisons.

Why ratio calculations matter

Ratios help compare amounts, scale values, and describe relationships between numbers. They are commonly used in math, business, cooking, maps, and measurements.

Simplified and equivalent ratios make patterns easier to read and apply.

What your result means

Your result shows the simplified or solved ratio based on the selected mode. It may also show decimal form, fraction form, and percentage equivalents.

Supporting values help explain how the ratio was reduced, solved, or compared so you can use the result confidently in real-world math.

Ratio calculator tips

Frequently asked questions

How do you simplify a ratio?

Divide both sides of the ratio by their greatest common factor.

What is an equivalent ratio?

An equivalent ratio shows the same relationship using different numbers.

How do you compare two ratios?

Convert both ratios to decimals or fractions and compare their values.

Can a ratio be written as a percentage?

Yes. A ratio can be converted to a fraction, decimal, and percentage.