Ratio calculator.
Use this free ratio calculator to get fast estimates, compare scenarios, and understand the numbers with clear step-by-step context.
Use the Ratio Calculator.
Results update automatically as you type. No account is required.
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About the Ratio Calculator
A ratio calculator simplifies a ratio between two terms to its lowest form and shows the relationship as a decimal and a percentage. Ratios compare quantities and appear in cooking, mixing, scaling, and finance.
How it works
Both terms are divided by their greatest common factor to simplify, just like reducing a fraction. The decimal form is simply term A divided by term B.
Reading the result
The donut chart shows each term’s share of the whole, making the proportion easy to see at a glance.
Note: Calculations run instantly in your browser and use exact mathematical formulas. For very large numbers, results are shown to standard floating-point precision.
FAQ
How do I scale a ratio?
Multiply both terms by the same number. The simplified ratio tells you the smallest whole-number relationship to scale from.
What is the difference between a ratio and a fraction?
A ratio compares two quantities (A to B); a fraction expresses a part of a whole. 16:9 as a fraction of the total is 16/25.
Where are ratios used?
Screen aspect ratios, recipe scaling, map scales, mixing concentrations, and financial ratios all rely on the same idea.