Ratio Calculator
Solve proportion ratios (A:B = C:D) and simplify ratio expressions.
Ratio Calculator
About Ratio Calculator
The Ratio Calculator solves proportion equations (A:B = C:D), simplifies ratios to their lowest terms (e.g. 1920:1080 to 16:9), and scales recipe, aspect ratio, or financial ratios up and down with instant step-by-step solutions.
How to Use Ratio Calculator
Step 1
Choose "Simplify Ratio" or "Solve Proportion (A:B = C:D)".
Step 2
Enter the ratio numbers into the corresponding fields.
Step 3
Click "Calculate Ratio".
Step 4
View the simplified fraction, decimal equivalent, and step-by-step solution.
Practical Use Cases for Ratio Calculator
Video & Screen Aspect Ratio Scaling
Simplify display resolutions (3840x2160, 1920x1080) to standard aspect ratios (16:9, 4:3, 21:9) and scale dimensions.
Culinary Recipes & Ingredient Scaling
Scale baking and cooking ingredient proportions up or down proportionally for larger or smaller batch sizes.
Input & Output Examples
Simplifying 1920 : 1080 Screen Resolution
Ratio: 1920 : 1080
Simplified: 16 : 9 (Greatest Common Divisor GCD = 120, Decimal: 1.778)
Key Features & Performance
- ✓Solves for missing value in four-part proportions (A : B = C : X).
- ✓Simplifies 2-part and 3-part ratios to lowest integer terms using GCD.
- ✓Converts ratios to equivalent decimals and percentages.
- ✓Step-by-step mathematical reduction steps.
- ✓100% Client-Side instant math engine.
- ✓1-Click Copy simplified ratio output.
Key Terminology & Definitions
Ratio
A quantitative relationship between two numbers indicating how many times the first number contains the second.
Greatest Common Divisor (GCD)
The largest positive integer that divides each of the integers in a ratio without leaving a remainder.