Galaxy A55 5G — 390.5 PPI
The Galaxy A55 5G features a 6.6-inch Super AMOLED 120Hz display at 1080 × 2340 pixels.
390.5
PPI
Retina-classAt 390 PPI, this exceeds the ~300 PPI threshold where individual pixels become imperceptible at hand-held distance. This is Retina-class density — sharp enough that increasing PPI further yields diminishing visible returns.
Compare with similar phones
457.6 PPI
iPhone 17 Pro Max
1320×2868 · 6.9″ · Retina-class
458.1 PPI
iPhone 17 Pro
1206×2622 · 6.3″ · Retina-class
461.4 PPI
iPhone 17
1179×2556 · 6.1″ · Retina-class
456.9 PPI
iPhone 17 Air
1260×2740 · 6.6″ · Retina-class
457.6 PPI
iPhone 16 Pro Max
1320×2868 · 6.9″ · Retina-class
458.1 PPI
iPhone 16 Pro
1206×2622 · 6.3″ · Retina-class
Calculate any screen's PPI
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.
—
PPI
—PPI = √(W² + H²) ÷ diagonal · Retina-class estimate ≥ 300 PPI (approximate; depends on viewing distance)