Screen PPI Calculator
Fill in the values and the answer updates as you type.
How the Screen PPI Calculator works
PPI = √(width² + height²) ÷ diagonal in inches. Pixel pitch = 25.4 mm ÷ PPI. Example: with Horizontal pixels 2,560 px, Vertical pixels 1,440 px, and Screen diagonal 27 in, the result is Pixels per inch (PPI) = 108.8; Pixel pitch (mm) = 0.2335; Megapixels = 3.7.
Inputs and results
The Screen PPI Calculator takes 3 inputs and gives 3 results.
What you enter
- Horizontal pixels (px) — starts at 2560.
- Vertical pixels (px) — starts at 1440.
- Screen diagonal (in) — starts at 27.
What you get
- Pixels per inch (PPI)
- Pixel pitch (mm)
- Megapixels
Example: Screen PPI Calculator with the starting values
With horizontal pixels 2560 px, vertical pixels 1440 px and screen diagonal 27 in, the calculator returns:
| Pixels per inch (PPI) | 108.8 |
|---|---|
| Pixel pitch (mm) | 0.2335 |
| Megapixels | 3.7 |
Change any value above and the results update straight away.
Screen PPI Calculator FAQ
How do I use the Screen PPI Calculator?
Enter horizontal pixels, vertical pixels and screen diagonal in the fields, then read pixels per inch (ppi), pixel pitch (mm) and megapixels in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Screen PPI Calculator calculate?
Pixel density from resolution and screen size. It returns pixels per inch (ppi), pixel pitch (mm) and megapixels from the 3 values you provide.
What values does the Screen PPI Calculator start with?
It opens with horizontal pixels 2560 px, vertical pixels 1440 px and screen diagonal 27 in so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Screen PPI Calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Screen PPI Calculator for important decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm important decisions with a qualified professional. See the Disclaimer for more.