1. What is a Pixel Density Calculator?

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

Purpose: It helps designers, developers, and consumers understand display quality and sharpness.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{PPI} \) — Pixels per inch (pixels/in)
• \( W \) — Width in pixels (px)
• \( H \) — Height in pixels (px)
• \( D \) — Diagonal screen size (inches, in)

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

3. Importance of Pixel Density

Details: Higher PPI means sharper images and text. Understanding PPI helps in choosing displays and designing graphics for different devices.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is a good PPI value?
A: For smartphones, 300+ PPI is considered good. For monitors, 100-140 PPI is typical. For printing, 300 PPI is standard.

Q2: Is higher PPI always better?
A: Higher PPI means sharper display, but beyond a certain point (depending on viewing distance), the difference becomes imperceptible.

Q3: How does PPI relate to DPI?
A: PPI refers to screen pixels, while DPI (dots per inch) refers to printer dots. They are often used interchangeably but are technically different.

Q4: Does PPI affect performance?
A: Higher PPI displays may require more GPU power to render graphics smoothly, potentially impacting performance.

Q5: How do I find my screen's resolution?
A: On Windows: Right-click desktop > Display settings. On Mac: Apple menu > About This Mac > Displays.