1. What is DPI?

DPI (Dots Per Inch) is a measurement of printing or video display resolution, indicating how many individual dots can fit in a 1-inch line. It's commonly used to describe the resolution quality of printers, scanners, and digital displays.

2. How Does the Calculator Work?

The calculator uses the DPI formula:

Where:

• \( Pixels\_width \) — Horizontal resolution in pixels
• \( Pixels\_height \) — Vertical resolution in pixels
• \( Diagonal\_inches \) — Screen diagonal size in inches

Explanation: The formula calculates the diagonal resolution in pixels and divides it by the physical screen size to determine dots per inch.

3. Importance of DPI Calculation

Details: Understanding DPI helps in assessing display quality, choosing appropriate screen resolutions, and ensuring proper image scaling for different devices.

4. Using the Calculator

Tips: Enter the screen resolution in pixels (width and height) and the physical 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 refers to dots per inch (printing), while PPI is pixels per inch (digital displays). They're often used interchangeably but technically different.

Q2: What is a good DPI for monitors?
A: Standard monitors are typically 72-96 DPI. High-resolution displays can range from 200-400 DPI or more.

Q3: Does higher DPI always mean better quality?
A: Higher DPI generally means sharper images, but viewing distance matters. Extremely high DPI may not be noticeable at normal viewing distances.

Q4: How does DPI relate to screen size?
A: For the same resolution, smaller screens have higher DPI because the pixels are packed more densely.

Q5: Can I calculate DPI without knowing the screen size?
A: No, you need both the resolution (in pixels) and the physical screen size (in inches) to calculate DPI.