Monitor PPI Calculator
Pixels per inch, or PPI, tells you how sharp a screen looks up close. Enter the resolution and the size and see the figure.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Find the diagonal pixel count with the Pythagorean theorem, the square root of the width squared plus the height squared. Divide that by the diagonal size in inches.
Higher numbers look sharper up close. Screens viewed from farther away can use a lower figure without looking soft.
Worked example
A 2,560 by 1,440 screen, 27 inches across the diagonal, has 109 pixels per inch.
Questions
What is a good PPI?
Many desktop monitors sit around 90 to 110. Phones and laptops are often much higher, and that is noticeable up close.
Where do I find the resolution?
It is in the display settings of your computer or the specification sheet of the monitor.
Does PPI tell me everything about picture quality?
No. Contrast, colour and brightness matter too, and PPI only measures pixel density.
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