Ratio Calculator

What this calculator does

Ratios compare two or more quantities. This calculator simplifies a two-part ratio and can scale it to a total amount for recipes, mixtures, shares or classroom maths.

Formula used

For whole-number inputs, the calculator divides both parts by their greatest common divisor. To scale the ratio, it divides the target total in proportion to the two parts.

How to read the result

A simplified ratio keeps the same relationship in smaller numbers. A scaled ratio keeps the relationship but changes the total quantity.

Assumptions

• Works best with positive two-part ratios.
• Decimal values are scaled directly.
• The target total is optional but helps turn the ratio into real quantities.

Sources and checks

This calculator uses a standard public formula. Where rules or thresholds can change, source links are listed on the relevant page.

Frequently asked questions