1. What is PPI?

PPI (Pixels Per Inch) is a measurement of the pixel density of electronic image devices like displays or digital cameras. It indicates how many pixels are in one linear inch of the display.

2. How Does the Calculator Work?

The calculator uses the PPI formula:

Where:

• \( width \) — Display width in pixels
• \( height \) — Display height in pixels
• \( diagonal \) — Screen diagonal size in inches

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

3. Importance of PPI Calculation

Details: PPI is important for understanding display quality. Higher PPI means sharper images as pixels are packed more densely. It's crucial for graphic design, photography, and choosing displays.

4. Using the Calculator

Tips: Enter the display's width and height in pixels, and the diagonal size in inches. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's a good PPI for a display?
A: For computer monitors, 90-110 PPI is common. Smartphones often have 300+ PPI. "Retina" displays are typically 220-300 PPI at normal viewing distances.

Q2: Is PPI the same as DPI?
A: While often used interchangeably, PPI refers to digital displays while DPI (dots per inch) refers to printer resolution.

Q3: Does higher PPI always mean better quality?
A: While higher PPI means sharper images, there's a point of diminishing returns based on viewing distance and human eye resolution.

Q4: How does PPI relate to resolution?
A: Resolution is the total pixel count (width × height), while PPI is the density of those pixels relative to physical size.

Q5: Can I calculate PPI without knowing the diagonal?
A: No, you need all three values (width, height, and diagonal) to accurately calculate PPI.