PPI guide
27 Inch 4K PPI: Pixel Density and Pixel Pitch
A 27 inch 4K monitor has many more pixels than a 27 inch 1440p display, but that also changes scaling and readability.
Quick answer
A 27 inch 3840 x 2160 display has about 163.18 PPI and a pixel pitch of about 0.156 mm.
How 27 inch 4K PPI is calculated
First calculate the pixel diagonal: sqrt(3840^2 + 2160^2). Then divide that number by the physical diagonal, 27 inches.
The result is about 163.18 pixels per inch. Pixel pitch is 25.4 mm divided by PPI, which gives about 0.156 mm.
Practical meaning
At 27 inches, 4K is very sharp but usually needs display scaling for comfortable text. Without scaling, interface elements can feel small.
A 27 inch 1440p monitor is about 108.79 PPI, which many users find comfortable at native scaling. Choose based on sharpness, scaling preference and graphics workload.
27 inch monitor PPI comparison
| Resolution | PPI | Pixel pitch |
|---|---|---|
| 1920 x 1080 | 81.59 | 0.311 mm |
| 2560 x 1440 | 108.79 | 0.233 mm |
| 3840 x 2160 | 163.18 | 0.156 mm |
Frequently asked questions
Is 4K worth it on 27 inches?
It is worth it if you value crisp text and images and are comfortable using display scaling.
What is the PPI of 27 inch 1440p?
About 108.79 PPI.
What does pixel pitch mean?
Pixel pitch is the physical distance between pixels. Smaller pitch means denser pixels.