Monitor size & resolution calculator
A bigger screen spreads the same pixels over more inches, so size and resolution have to be judged together. Enter a diagonal and resolution to see the real pixel density, how far to sit, and whether stepping up to 4K would actually look sharper for you.
At 24″, this 27″ 1440p panel sits around 46 pixels per degree — below the ~60 PPD acuity limit, so a sharper panel (4K) would look noticeably crisper at this distance.
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Frequently asked questions
How do I know if I'll see the difference between 1440p and 4K?
It depends on pixel density and how far you sit. This calculator estimates the pixels-per-degree your eye receives; past roughly 60 pixels per degree, most people can't resolve more detail, so a higher resolution stops helping.
What is a good pixel density for a monitor?
Around 90 to 110 pixels per inch (PPI) looks crisp at a typical desk distance. A 27-inch 1440p monitor is about 109 PPI; a 27-inch 4K is about 163 PPI, which is sharper but often needs display scaling.
How far should I sit from my monitor?
Far enough that you can't pick out individual pixels but close enough to fill a comfortable field of view. The calculator gives an ideal distance where your monitor's pixel density hits the limit of what your eye can resolve.