Ratio Calculator: The Complete Guide
Make sense of any ratio. Enter two values to see the ratio simplified to lowest terms, expressed as a decimal, and broken down into what percentage each part is of the whole.
Who the Ratio Calculator is for
People working with proportions — recipes, mixes, aspect ratios, or splitting amounts.
How to use the Ratio Calculator
- Type your values into the fields above — pick your currency or units where the calculator offers them.
- Results update automatically as you type; there's no submit button and nothing is sent to a server.
- Adjust any input to compare scenarios, then copy the result with a single click.
How it works
A ratio A : B is simplified by dividing both terms by their greatest common divisor. The decimal form is A ÷ B, and each part's share of the total is its value ÷ (A + B) × 100.
Features
- Simplified ratio
- Decimal form
- Parts of the whole
- Instant result
Reading ratios
A ratio compares two quantities. Simplifying it to lowest terms makes it easier to read and compare — 1920 : 1080 becomes 16 : 9. Expressing it as a decimal or as percentages of the total helps when you need to scale a recipe, split a bill, or understand proportions.