1. What is Screen DPI?

Screen DPI (Dots Per Inch) measures the pixel density of a display, indicating how many pixels fit into a linear inch of screen space. Higher DPI means sharper images and text.

2. How Does the Calculator Work?

The calculator uses the DPI formula:

Where:

• \( width \) — Screen width in pixels
• \( height \) — Screen height in pixels
• \( diagonal\_inches \) — Diagonal screen size in inches

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

3. Importance of DPI Calculation

Details: Knowing your screen's DPI helps in designing graphics, understanding display quality, and ensuring proper scaling of UI elements across different devices.

4. Using the Calculator

Tips: Enter your screen's resolution (width × height in pixels) and its diagonal size in inches. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between DPI and PPI?
A: DPI (Dots Per Inch) refers to printer resolution, while PPI (Pixels Per Inch) refers to screen resolution, though they're often used interchangeably for displays.

Q2: What is a good DPI for a monitor?
A: Standard monitors are around 90-110 DPI. "Retina" displays are 200+ DPI. Smartphones often exceed 300 DPI.

Q3: Does higher DPI always mean better quality?
A: Higher DPI means sharper images, but beyond ~300 DPI at normal viewing distances, the human eye can't perceive the difference.

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

Q5: Does DPI affect performance?
A: Higher DPI displays require more GPU power to render graphics at native resolution, which can impact performance in graphics-intensive applications.