Convertisseur DPI en PPI Gratuit
Convertissez entre DPI (points par pouce) et PPI (pixels par pouce). Comprenez la différence pour l'impression et l'affichage.
px
px
inches
Pixels Per Inch (PPI)
91.8 PPI
Taille du pixel0.277 mm
Total Pixels2,073,600 px
Formule
Screen PPI Calculation
PPI = sqrt(W² + H²) / Diagonal Inches
Where W and H are the pixel dimensions.
Common Screen PPI
Exemple Résolu
1920x1080 display, 24-inch diagonal.
- 01Diagonal pixels = sqrt(1920² + 1080²) = 2203
- 02PPI = 2203 / 24 = 91.8 PPI
- 03Pixel size = 25.4 / 91.8 = 0.277 mm
Questions Fréquentes
What PPI is considered "Retina"?
Apple defines Retina as a PPI where individual pixels are indiscernible at typical viewing distance. For phones (held close), this is ~326+ PPI. For laptops (~18 inches away), ~220+ PPI. For desktops (24+ inches), ~110+ PPI.
Is higher PPI always better?
Higher PPI means sharper text and images but also requires more GPU power and makes UI elements smaller unless scaled. For most desktop use, 100-163 PPI is comfortable.
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