PPI Calculator
Enter a screen's pixel resolution and diagonal size in inches to calculate pixels per inch (PPI).
Pixel density
91.8 PPI
Diagonal pixels: 2,203
Popular monitors — PPI comparison
| Display | Resolution | PPI |
|---|---|---|
| 24 in Full HD monitor | 1920 x 1080 | 92 |
| 27 in QHD monitor | 2560 x 1440 | 109 |
| 27 in 4K UHD monitor | 3840 x 2160 | 163 |
| 32 in 4K UHD monitor | 3840 x 2160 | 138 |
| 34 in Ultrawide QHD monitor | 3440 x 1440 | 110 |
| 15.6 in Full HD laptop | 1920 x 1080 | 141 |
| 13.3 in QHD laptop | 2560 x 1440 | 221 |
Source note: PPI values are calculated here from each display's stated resolution and diagonal size using PPI = diagonal pixels / diagonal inches. Diagonal sizes are nominal manufacturer sizes.
How to use this calculator
1. Enter pixel resolution and diagonal size in inches. 2. Read the PPI. 3. Compare displays at the same viewing distance, not across very different sizes.
Formula
Diagonal pixels = sqrt(Width^2 + Height^2). PPI = Diagonal pixels / Diagonal inches.
Worked example: 1920 x 1080 on a 24 inch screen gives About 92 PPI.
Frequently asked questions
What is PPI?
PPI is the number of pixels per inch on a display, calculated from the diagonal pixel count divided by the diagonal size in inches.