Ratio Calculator
Calculate missing values in ratios and solve proportion problems
Ratio Calculator
Use our ratio calculator below to find the missing value in a ratio. Provide any three values to calculate the fourth in the ratio A:B = C:D. Also includes ratio scaling and aspect ratio tools for comprehensive ratio calculations.
Quick Navigation
🔢 Basic Ratio Calculator
📊 Calculation Results
How it works
A × D = B × C
3 × D = 4 × 600
D = (4 × 600) ÷ 3 = 800
📏 Ratio Scaling Calculator
Scale ratios up or down by a specific factor. Perfect for resizing images, maps, blueprints, or any proportional scaling needs.
Result
🖥️ Common Screen Aspect Ratios
Reference table of common screen resolutions and their aspect ratios. These are widely used in displays, videos, and digital content.
| Name | Aspect Ratio | Width (pixels) | Height (pixels) |
|---|---|---|---|
| 480p | 3:2 | 720 | 480 |
| 576p | 5:4 | 720 | 576 |
| 720p | 16:9 | 1,280 | 720 |
| 1080p | 16:9 | 1,920 | 1,080 |
| 4K UHD | 16:9 | 3,840 | 2,160 |
| 8K UHD | 16:9 | 7,680 | 4,320 |
| XGA | 4:3 | 1,024 | 768 |
| WQHD | 16:9 | 2,560 | 1,440 |
📚 Understanding Ratios
What is a Ratio?
A ratio is a quantitative relationship between two numbers that describes how many times one value can contain another. Ratios are often expressed as two numbers separated by a colon (:).
Cross Multiplication
To solve ratio problems, we use cross multiplication. In the ratio A:B = C:D, we multiply A × D = B × C to find the missing value.
Common Applications
Ratios are used in cooking recipes, map scales, aspect ratios for screens, describing odds, and many other real-world applications.
Ratio Applications and Examples
A ratio is a quantitative relationship between two numbers that describe how many times one value can contain another. Applications of ratios are fairly ubiquitous, and the concept of ratios is quite intuitive.
As shown above, ratios are often expressed as two numbers separated by a colon. They can also be written as "1 to 2" or as a fraction ½. The ratio represents the number that needs to be multiplied by the denominator in order to yield the numerator.
Common Uses of Ratios
- Screen aspect ratios: Describing screen dimensions and video formats
- Maps and models: Scaled-down versions of actual sizes
- Cooking and baking: Recipe proportions and ingredient ratios
- Financial analysis: Price-to-earnings ratios, debt-to-income ratios
- Medicine: Drug dosage calculations and concentration ratios
- Architecture: Building proportions and scale drawings