1. What is PPI (Pixels Per Inch)?

Definition: PPI measures the pixel density of a screen or image, indicating how many pixels are displayed per inch of screen space.

Purpose: It helps determine the sharpness and clarity of displays, important for designers, photographers, and anyone working with digital images.

2. How Does the PPI Calculator Work?

The calculator uses the formula:

Where:

• \( PPI \) — Pixels per inch
• \( Width \) — Screen width in pixels
• \( Height \) — Screen height in pixels
• \( Diagonal \) — Screen diagonal measurement in inches

Explanation: The formula calculates the diagonal resolution in pixels (using Pythagorean theorem) and divides by the physical screen size.

3. Importance of PPI Calculation

Details: Higher PPI means sharper images. Understanding PPI helps when choosing displays, designing graphics, or preparing images for print.

4. Using the Calculator

Tips: Enter the screen resolution (width and height in pixels) and the physical diagonal 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 display quality.

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

Q3: Does higher PPI always mean better quality?
A: While higher PPI means sharper images, there's a point of diminishing returns where the human eye can't perceive additional detail.

Q4: How do I find my screen's resolution?
A: On Windows: Right-click desktop > Display settings. On Mac: Apple menu > About This Mac > Displays.

Q5: What's the PPI of a 4K 27-inch monitor?
A: Approximately 163 PPI (3840x2160 resolution on 27" diagonal).