1. What is a PPI Calculator?

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

Purpose: It helps compare display sharpness and understand how resolution and screen size affect image clarity.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{PPI} \) — Pixels per inch (pixel density)
• \( \text{Width} \) — Horizontal resolution in pixels
• \( \text{Height} \) — Vertical resolution in pixels
• \( \text{Diagonal} \) — Screen size in inches (measured diagonally)

Explanation: The formula calculates the diagonal resolution in pixels and divides it by the physical screen size.

3. Importance of PPI Calculation

Details: Higher PPI means sharper images. Understanding PPI helps when choosing displays for different viewing distances.

4. Using the Calculator

Tips: Enter the screen resolution (width and height in pixels) and the diagonal screen size 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 viewing at close distances.

Q2: How does PPI relate to viewing distance?
A: Higher PPI matters more for close viewing (phones, tablets). For TVs viewed from far away, lower PPI is acceptable.

Q3: Is higher PPI always better?
A: While higher PPI means sharper images, there's a point of diminishing returns where human eyes can't perceive the difference.

Q4: What's the difference between PPI and DPI?
A: PPI refers to screen pixels, while DPI refers to printer dots. They're often used interchangeably but are technically different.

Q5: Does PPI affect performance?
A: Higher PPI displays require more GPU power to render graphics at their native resolution.