Google Pixel 7a

Pixel pitch (computed from PPI; a rectangular estimate, not a measured panel pitch)

58.9 um

Physical size (computed from the rectangle, not the usable area)

2.5 by 5.56 in (6.4 by 14.1 cm)

Aspect ratio (computed)

9:20

Megapixels (computed)

2.59

Looks sharp from (assuming 20/20 vision, one pixel per arcminute)

8 in and further

Pixels per degree at an assumed 12 in viewing distance

90.4

Every row above is computed here from the stated resolution and the stated diagonal. With w and h in pixels and the diagonal in inches: PPI = sqrt(w^2 + h^2) / diagonal, which here is sqrt(1080^2 + 2400^2) / 6.1; pixel pitch = 25.4 mm / PPI; physical size = pixels / PPI, which is the full panel rectangle and not the usable area, so a screen with rounded corners or a notch has less usable area than the size shown; sharpness distance = 1 / (PPI x tan(1/60 degree)), the distance at which one pixel spans one arcminute for 20/20 vision; pixels per degree = 2 x distance x tan(0.5 degree) x PPI at the assumed viewing distance. Values are rounded to two decimals, and to one decimal for the pitch, the sizes in centimeters, the distances, and the pixels per degree.