The Screen Resolution & Aspect Ratio Checker detects your display’s resolution and tells you its aspect ratio, total megapixels and the named standard it matches. You can also type any width and height to identify the ratio of a different screen or image — all in your browser.
What it detects
On load, the tool reads your screen’s width and height and multiplies by your device pixel ratio to report physical pixels — the true resolution behind the CSS pixels a page normally sees. It then reduces those numbers to an aspect ratio.
How the aspect ratio is found
The width and height are divided by their greatest common divisor to reduce the ratio to lowest terms, then matched against the common standards:
| Resolution | Ratio | Standard |
|---|---|---|
| 1920×1080 | 16:9 | Widescreen HD/4K |
| 2560×1600 | 16:10 | Widescreen laptops |
| 3440×1440 | 21:9 | Ultrawide |
| 2048×1536 | 4:3 | Classic / tablets |
Enter any resolution to identify its ratio, decimal value and megapixel count. Everything is read and calculated locally in your browser — nothing is uploaded.