🖥️ Screen Resolution & PPI Calculator
Enter a resolution and diagonal size to get pixel density (PPI), aspect ratio, total megapixels, and the matching display standard — everything you need to compare monitors and laptops.
🖥️ Display metrics
📺 This matches the 1080p (Full HD) standard.
PPI = √(width² + height²) ÷ diagonal inches. Higher PPI looks sharper; around 90–110 PPI is typical for a desktop monitor, while phones and 4K laptops run far denser. These are general estimates.
Resolution is only half the story
Two monitors can share the same 1920×1080 resolution and look completely different — because sharpness depends on how those pixels are packed into the screen size. A 1080p 24-inch monitor and a 1080p 32-inch monitor have the same pixels but very different pixel density, and the bigger one looks softer up close.
This calculator turns width, height, and diagonal into the numbers that actually matter: PPI for sharpness, aspect ratio for shape, and megapixels for the total detail your GPU has to push each frame.
❓ Frequently Asked Questions
How is pixel density (PPI) calculated?
PPI is the diagonal resolution in pixels divided by the diagonal size in inches: PPI = √(width² + height²) ÷ diagonal. For a 1920×1080 display on a 24-inch screen, √(1920² + 1080²) = 2202.9 pixels, divided by 24 gives about 91.8 PPI. The same 1080p panel at 15.6 inches is far denser at about 141 PPI.
How is the aspect ratio worked out?
The tool divides the width and height by their greatest common divisor to reduce the ratio. 1920×1080 reduces to 16:9; 2560×1440 is also 16:9; 1920×1200 reduces to 8:5, which is marketed as 16:10. The reduced ratio tells you the shape of the display regardless of its resolution.
What counts as a good PPI?
It depends on viewing distance. Desktop monitors around 90–110 PPI look fine at arm's length; laptops and phones, viewed closer, benefit from 150 PPI and up. Very high PPI ('Retina'-class) makes individual pixels invisible. There is no single right number — higher is sharper but demands more GPU power.
Are these figures exact?
The pixel, aspect, and PPI maths are exact for the numbers you enter, but treat the results as general estimates: the advertised diagonal is sometimes rounded, and panels with unusual pixel shapes or borders can differ slightly. Use it to compare displays and understand sharpness, not for manufacturing tolerances.