Screen PPI Calculator
Calculate the pixel density (PPI) of a display from its resolution and diagonal size in inches.
- Diagonal in pixels
- 2203
Formula: PPI = √(w² + h²) / diagonal
About Screen PPI Calculator
Screen PPI Calculator is a free online calculator that gives you an instant, accurate result as you type. Calculate the pixel density (PPI) of a display from its resolution and diagonal size in inches.
The calculation uses the standard formula PPI = √(w² + h²) / diagonal and updates live with every change to the inputs. Everything runs client-side in your browser — fast, private, and free to use as often as you like.
Apple’s original "Retina" threshold was about 300 PPI at typical phone viewing distance, where individual pixels become indistinguishable.
Frequently Asked Questions
Is Screen PPI Calculator free to use?
Yes. Screen PPI Calculator is completely free, with no sign-up, no downloads, and no usage limits. You can use it as many times as you like on any device with a web browser.
How accurate is this calculator?
The calculator applies the standard formula (PPI = √(w² + h²) / diagonal) with full floating-point precision and rounds only the displayed result. For most practical purposes the results are exact.
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