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PPI Calculator (Pixels Per Inch)
Calculate the pixel density (PPI) of a screen or image from its resolution and diagonal size.
Pixels per inch (PPI)
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About the PPI Calculator (Pixels Per Inch)
Pixels Per Inch (PPI) measures how densely packed a screen's pixels are. Higher PPI means a sharper, crisper image since more pixels are packed into the same physical space.
Formula: PPI = √(Width² + Height²) ÷ Diagonal Size (inches)
The numerator finds the diagonal resolution in pixels using the Pythagorean theorem, then divides by the physical diagonal size to get pixels per inch. This is useful for comparing display sharpness across monitors, phones and printed photos.
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