1. What is PPI?

PPI (Pixels Per Inch) is a measurement of pixel density that indicates how many pixels are displayed per inch on a digital display. It's an important factor in determining the sharpness and clarity of images on screens.

2. How Does the Calculator Work?

The calculator uses the PPI formula:

Where:

• \( Width \) — Horizontal resolution in pixels
• \( Height \) — Vertical resolution in pixels
• \( Diagonal \) — Physical screen diagonal in inches

Explanation: The formula calculates the diagonal resolution in pixels and divides it by the physical diagonal measurement in inches to determine pixel density.

3. Importance of PPI Calculation

Details: PPI is crucial for understanding display quality, comparing different monitors, and determining the optimal viewing distance. Higher PPI values generally indicate sharper and more detailed images.

4. Using the Calculator

Tips: Enter the horizontal and vertical resolution in pixels, and the physical diagonal size in inches. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a good PPI value for monitors?
A: For typical desktop viewing distances (20-30 inches), 100-140 PPI is generally considered good. Higher values are better for closer viewing.

Q2: How does PPI relate to Retina displays?
A: Retina displays are Apple's marketing term for displays with PPI high enough that individual pixels are not discernible at normal viewing distances.

Q3: Is higher PPI always better?
A: While higher PPI generally means sharper images, it also requires more graphics processing power and may not be noticeable beyond certain thresholds depending on viewing distance.

Q4: How does PPI affect text readability?
A: Higher PPI displays typically render text more sharply and clearly, reducing eye strain during prolonged reading sessions.

Q5: Can I calculate PPI for non-rectangular displays?
A: The standard PPI calculation assumes rectangular displays. For non-standard shapes, different calculation methods may be required.