Ratio
Calculate and simplify ratios, find equivalent ratios
How to use Ratio
- 1Enter the values of your ratio, such as A : B.
- 2Add a known value for the missing side if you want to scale it.
- 3Read the simplified ratio and any scaled equivalent instantly.
What Is a Ratio?
A : B → divide both by gcd(A, B) to simplifyA ratio compares two quantities and shows their relative size. Simplifying a ratio keeps the same relationship with the smallest whole numbers.
Ratios appear in recipes, maps, finance, and mixing — anywhere you need to keep one quantity proportional to another.
Frequently asked questions
How do I simplify a ratio?
Divide both sides by their greatest common divisor so the numbers share no common factor other than 1.
Can I scale a ratio to a known total?
Yes. If you know one part, the calculator finds the matching other part that preserves the same proportion.
What is a 1:1 ratio?
It means the two quantities are equal in size; scaling one scales the other by the same amount.