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PPI Formula:
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PPI (Pixels Per Inch) is a measurement of pixel density that indicates how many pixels are displayed per inch on a digital screen. It's an important metric for determining image quality and display sharpness.
The calculator uses the PPI formula:
Where:
Explanation: The formula calculates pixel density by dividing the total number of pixels by the physical screen size in inches.
Details: PPI is crucial for determining display quality, image sharpness, and optimal viewing distance. Higher PPI values generally indicate sharper and more detailed images.
Tips: Enter the total number of pixels along one dimension and the corresponding physical length in inches. Both values must be positive numbers.
Q1: What is a good PPI value for displays?
A: For computer monitors, 90-110 PPI is standard. For smartphones, 300-500+ PPI is common. Higher PPI provides sharper images but may require scaling for comfortable viewing.
Q2: How is PPI different from DPI?
A: PPI refers to pixels per inch on digital displays, while DPI (dots per inch) refers to printed material. They are often used interchangeably but technically measure different things.
Q3: Can I calculate PPI for both width and height?
A: Yes, but most displays have the same PPI in both dimensions since pixels are square. For rectangular pixels, you would calculate separate horizontal and vertical PPI values.
Q4: Does higher PPI always mean better quality?
A: Generally yes, but beyond a certain point (around 300 PPI at normal viewing distances), the human eye cannot distinguish individual pixels, making higher PPI less noticeable.
Q5: How do I measure inches for PPI calculation?
A: Measure the physical screen size diagonally for overall PPI, or measure the width/height for specific dimension PPI calculations.