What Is the Screen PPI & Display Calculator?
Pixel density measures the concentration of individual picture elements per linear inch of display surface.
How Does the Screen PPI & Display Calculator Work?
Calculates diagonal resolution via Pythagorean theorem and divides by physical diagonal length in inches.
Screen PPI & Display Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
\text{PPI} = \frac{\sqrt{W^2 + H^2}}{\text{Diagonal}_{\text{inches}}}
Uses the Pythagorean theorem to compute diagonal pixels, divided by diagonal screen size.
How to Use the Screen PPI & Display Calculator
- Enter screen resolution (e.g., 2560×1440) and diagonal measurement (e.g., 27").
Step-by-Step Example Calculation
27-inch 1440p display
Input Values:
width:2560
height:1440
diagonal:27
Worked Steps: A 27-inch 1440p monitor has a pixel density of ~108.8 PPI (0.233 mm dot pitch).
Understanding Your Result
Values above 100 PPI offer comfortable desktop clarity; 200+ PPI delivers Apple Retina-grade sharpness.
Factors That Affect the Result
- Viewing distance: phones viewed at 12 inches require ~300+ PPI, while TVs viewed at 8 feet need only ~60–80 PPI.
When Should You Use This Calculator?
- Buying a computer monitor, sizing UI typography for mobile apps, and selecting television displays.
Assumptions & Limitations
- Assumes standard square subpixels (1:1 pixel aspect ratio).
Frequently Asked Questions
Calculation Accuracy & Reference Note
Standard display geometry formula.