Display Screen Aspect Ratio Calculator
Local ProcessingCalculate standard aspect ratio (e.g. 16:9, 4:3, 21:9) from screen pixel width and height.
How It Works & Processing Standards
Enter values above to calculate results automatically. Check each input field for guidance and units.
Example: Pixel Width = 1920, Pixel Height = 1080 → Ratio = 16:9, Decimal = 1.777778
Tool processing runs in your browser. If you create a calculator or conversion share link, its values are included in the URL. See the privacy policy for account, analytics and advertising data.
Tells you that 1920 × 1080 is 16:9 and what 2560 × 1080 really is.
How to Use Display Screen Aspect Ratio Calculator
- 1Enter width and heightThe resolution in pixels.
- 2Read the ratioThe simplest ratio (divided by the GCD) and the decimal ratio.
- 3Use itCompare decimal ratios when choosing another resolution with the same shape.
Examples
Full HD
Input: 1920 × 1080
Result: 16:9
Ultrawide monitor
Input: 2560 × 1080
Result: 64:27
Common Use Cases
- Checking a monitor or TV ratio
- Whether a video or thumbnail matches a platform’s ratio
- Choosing a ratio before cropping an image
Frequently Asked Questions (FAQ)
Isn’t 2560 × 1080 21:9?
It is marketed as 21:9, but the exact ratio is 64:27 (about 2.37:1). 21:9 is about 2.33:1.
How do I crop to that ratio?
Use the image crop tool with a fixed ratio.