PPI of iPhone 17
The iPhone 17 display measures 1179×2556 pixels across a6.1-inch diagonal, giving it a pixel density of approximately461.4 PPI. The iPhone 17 Pro is slightly sharper at about 458.1 PPI.
iPhone 17
461.4 PPI
1179×2556 · 6.1″
iPhone 17 Pro
458.1 PPI
1206×2622 · 6.3″
Is that Retina-class?
Both exceed the ~300 PPI rule-of-thumb, so at typical phone viewing distance the individual pixels are not perceivable — effectively Retina-class. Note that "Retina" is Apple's marketing term and depends on viewing distance, not a fixed PPI number.
Calculate PPI for any screen
PPI Calculator
√(W²+H²) ÷ size — precise to 0.1 PPIUnit:
in
Use the diagonal printed on the box or spec sheet.
in wide
For when you measured the viewable width with a ruler.
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PPI
—PPI = √(W² + H²) ÷ diagonal · Retina-class estimate ≥ 300 PPI (approximate; depends on viewing distance)