Practical measurement guide
PPI Calculator
Calculate pixels per inch from screen resolution and diagonal size, with formula and display-density examples.
PPI equals diagonal pixels divided by diagonal inches.
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91.79 PPI
√(1920² + 1080²) ÷ 24 = 91.79 pixels per inch
PPI formula
Pixels per inch equals the diagonal pixel count divided by the screen diagonal in inches: √(width² + height²) ÷ diagonal inches.
What PPI tells you
PPI describes pixel density, not physical screen size. Use it to compare sharpness when resolution and diagonal size are both known.
Related measurement tools
Frequently asked questions
What is the PPI formula?
PPI = √(width pixels² + height pixels²) ÷ diagonal inches.
Does higher PPI mean a larger screen?
No. PPI measures pixel density, not physical screen size.