Aspect Ratio Calculator
Calculate, simplify, and resize aspect ratios for images, videos, and screens.
Aspect Ratio Calculator
Calculate, convert, and resize with any aspect ratio
Aspect Ratio
16:9
Decimal
1.7778
Percentage
177.78%
Common Aspect Ratios
| Ratio | Name / Use Case | |
|---|---|---|
| 16:9 | HD Video — YouTube, TV | Use |
| 4:3 | Old TV — iPad | Use |
| 1:1 | Square — Instagram Square | Use |
| 9:16 | Vertical — Stories, TikTok | Use |
| 21:9 | Ultrawide — Cinema, Monitor | Use |
| 3:2 | Photography — DSLR | Use |
| 2:3 | Portrait — Portrait Photo | Use |
| 1:1.414 | A4 Paper — Print, Document | Use |
How to Use Aspect Ratio Calculator
- 1
Enter width and height to calculate the simplified aspect ratio.
- 2
View the ratio, decimal value, percentage, and visual preview.
- 3
Switch to Resize mode to calculate dimensions from a preset ratio.
- 4
Click any ratio in the reference table to use it instantly.
About Aspect Ratio Calculator
Calculate and convert aspect ratios instantly with our free Aspect Ratio Calculator. Two powerful modes help you work with any ratio:
**Calculate Ratio**: Enter width and height to get the simplified aspect ratio (e.g., 1920x1080 = 16:9), decimal value, and percentage. A visual preview shows the proportional rectangle, and the tool highlights matching standard ratios like 16:9, 4:3, 1:1, and more.
**Resize by Ratio**: Select a preset ratio (16:9, 4:3, 1:1, 21:9, 3:2, 9:16, etc.) or use a custom ratio, enter one dimension, and the other calculates automatically. Lock/unlock width or height to control which dimension you set.
Includes a quick-reference table of common aspect ratios with names, use cases, and example resolutions. Click any ratio to instantly use it in the calculator. Perfect for video editors, photographers, designers, and developers working with responsive layouts.