Calculate My Ppi

PPI Formula:

\[ PPI = \frac{\sqrt{Width^2 + Height^2}}{Diagonal} \]

PPI (pixels/inch):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is PPI?

PPI (Pixels Per Inch) is a measurement of the pixel density of electronic display devices. It indicates how many pixels are present per inch of screen space, which affects the sharpness and clarity of displayed content.

2. How Does the Calculator Work?

The calculator uses the PPI formula:

\[ PPI = \frac{\sqrt{Width^2 + Height^2}}{Diagonal} \]

Where:

\( Width \) — Screen width in pixels
\( Height \) — Screen height in pixels
\( Diagonal \) — Screen diagonal measurement in inches

Explanation: The formula calculates the diagonal pixel count using the Pythagorean theorem, then divides by the physical screen diagonal to determine pixel density.

3. Importance of PPI Calculation

Details: PPI is crucial for understanding display quality. Higher PPI values generally mean sharper images and text. This measurement is important for comparing display devices, designing graphics for specific screens, and ensuring optimal viewing experiences.

4. Using the Calculator

Tips: Enter the screen resolution (width and height in pixels) and the physical diagonal measurement in inches. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between PPI and DPI?
A: PPI refers to pixels per inch on digital displays, while DPI (dots per inch) refers to printer resolution. Though often used interchangeably, they measure different things.

Q2: What is considered a good PPI value?
A: For smartphones, 300+ PPI is generally good. For computer monitors, 100-140 PPI is common. For high-resolution "Retina" displays, values exceed 200 PPI.

Q3: Does higher PPI always mean better quality?
A: Generally yes, but there's a point of diminishing returns where the human eye can't perceive additional sharpness, and higher PPI may impact performance and battery life.

Q4: How does viewing distance affect PPI requirements?
A: Devices viewed from farther away (like TVs) require lower PPI than devices viewed up close (like smartphones) to achieve the same perceived sharpness.

Q5: Can I calculate PPI for non-rectangular displays?
A: This formula works best for standard rectangular displays. For irregular shapes, more complex calculations would be needed.