1. What is a PPI Calculator?

Definition: PPI (Pixels Per Inch) calculator determines the pixel density of a digital display based on its resolution and screen size.

Purpose: It helps compare display quality, understand image sharpness, and make informed decisions when purchasing screens.

2. How Does the PPI Calculator Work?

The calculator uses the formula:

Where:

• \( PPI \) — Pixels per inch (pixel density)
• \( P_x \) — Horizontal pixel count
• \( P_y \) — Vertical pixel count
• \( D \) — Screen diagonal size in inches

Explanation: The formula calculates the diagonal pixel count (using Pythagorean theorem) and divides by the physical screen size.

3. Importance of PPI Calculation

Details: Higher PPI means sharper images and text. PPI affects viewing experience, especially for high-resolution content and close viewing distances.

4. Using the Calculator

Tips: Enter the screen resolution (horizontal and vertical pixels) and the physical screen size (diagonal in inches). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a good PPI for a smartphone?
A: Modern smartphones typically have 300-500 PPI for sharp display at close viewing distances.

Q2: How does PPI relate to DPI?
A: PPI refers to screen pixels, while DPI (dots per inch) refers to printer resolution. They're often used interchangeably but technically different.

Q3: Does higher PPI always mean better quality?
A: While higher PPI means sharper display, other factors like color accuracy, contrast, and viewing angles also affect perceived quality.

Q4: What's the PPI of a 24" 1920×1080 monitor?
A: Approximately 92 PPI (1920×1080 resolution on 24" diagonal).

Q5: Can I calculate PPI if I know the screen dimensions?
A: Yes, you can use width and height in inches instead of diagonal, but the diagonal method is more common and simpler.