Enter horizontal resolution, vertical resolution, and diagonal size (in inches). PPI = square root of (w² + h²) divided by the diagonal.
Pixels per inch (PPI)
163
High density (150-220 PPI)
Tip: Apple considers a display "Retina" at roughly 220 PPI for laptops, 300 PPI for phones. Typical 1080p 24" monitors are ~92 PPI; 4K 27" is ~163 PPI.