PPI & Viewing Distance Calculator

Here’s a comprehensive table summarizing the key information about PPI (Pixels Per Inch) and viewing distance:

Aspect	Details
PPI Definition	Pixels Per Inch; measure of pixel density in digital images and displays14
PPI vs DPI	PPI for digital displays, DPI for print resolution34
Optimal PPI Range	Generally 300-400 PPI for most devices viewed at normal distance2
High PPI Range	100-140 PPI (high), >140 PPI (very high)4
Standard Web PPI	72 PPI for online use4
Print Standard	300 PPI for high-quality prints4
Viewing Distance Formula	Optimal viewing distance (inches) = 3500 / PPI5
Print Size Formula	Print size (inches) = Number of pixels / PPI4
Minimum PPI Formula	Minimum PPI = 3438 / Viewing distance (inches)7
Optimal Viewing Distance	1.5 to 2 times the diagonal length of the print7
Factors Affecting Perception	Viewing distance, lighting, temperature, viewing duration, brightness6
Large Format Printing	Lower PPI (10-20) acceptable for billboards due to long viewing distance6
Effect of Higher PPI	Increased detail, clarity, and smoothness in images4
Effect of Lower PPI	Potential pixelation or blurriness, especially at close distances4

This table provides a concise overview of the relationship between PPI and viewing distance, including formulas for calculations and key considerations for different applications. Remember that these guidelines can be adjusted based on specific needs and viewing conditions.