Ratio Calculator
Reduce two numbers to their simplest whole-number ratio and optionally scale the relationship so the first term equals a chosen target. It is useful for recipes, mixtures, maps, dimensions and everyday proportional reasoning.
Simplified ratio3:4
Scaled ratio12:16
Second ÷ first1.333333
How this tool works
For whole numbers, divide both terms by their greatest common divisor. To scale, multiply both terms by target first term ÷ original first term.
Example
The ratio 18:24 simplifies to 3:4. Scaling that relationship so the first term is 12 produces 12:16.
Common questions
Can I enter decimals?
Yes for scaling. The simplest-ratio display converts common decimal values to an integer approximation before reducing.
Is order important?
Yes. A:B and B:A describe reciprocal relationships and are generally not interchangeable.