Screen Resolution / Aspect Ratio Calculator
Enter a resolution to get its simplified aspect ratio and megapixel count, or compare two resolutions.
Last updated
—Aspect ratio
—Common name
—Megapixels
—Ratio (decimal)
About this tool
The aspect ratio is the width and height divided by their greatest common divisor — 1920×1080 shares a GCD of 120, reducing to the familiar 16:9. "Common name" matches against widely-used ratios (16:9, 4:3, 21:9, 16:10, 3:2, 1:1, 5:4) within a small tolerance, since real-world resolutions don't always reduce to a perfectly clean fraction.
Nothing you enter here is sent to a server — the entire tool runs as JavaScript in your browser tab.