Dev & Web
Screen Resolution & DPI Calculator
Enter your screen resolution and physical size to calculate pixels per inch (PPI). See how your display compares to common screens like iPhone, MacBook, and 4K monitors.
| Device | Resolution | Size | PPI |
| iPhone 15 Pro | 2556×1179 | 6.12″ | 460 |
| iPhone 14 | 2532×1170 | 6.1″ | 460 |
| MacBook Pro 14" | 3024×1964 | 14.2″ | 254 |
| MacBook Pro 16" | 3456×2234 | 16.2″ | 254 |
| iPad Pro 12.9" | 2732×2048 | 12.9″ | 264 |
| 4K Monitor 27" | 3840×2160 | 27″ | 163 |
| Full HD 24" | 1920×1080 | 24″ | 92 |
| Full HD 27" | 1920×1080 | 27″ | 82 |
| Samsung Galaxy S23 | 2340×1080 | 6.1″ | 425 |
How it works
The calculator computes the diagonal pixel count using the Pythagorean theorem, then divides by your screen's physical diagonal size to get pixels per inch. Compare your result to the reference table of popular devices.
Frequently asked questions
What is PPI (pixels per inch)?
PPI measures how many pixels fit into one inch of a display. Higher PPI means sharper images. A display above 300 PPI is generally considered Retina quality at typical viewing distances.
What is the difference between PPI and DPI?
PPI refers to screen pixel density, while DPI (dots per inch) refers to printer or image resolution. They measure the same concept (density) in different contexts.
What PPI do I need for a retina display?
Apple's Retina standard is roughly 220+ PPI for laptops and 300+ PPI for phones (viewed at typical distances). At typical desktop distance, 110+ PPI appears sharp.
Does higher PPI always look better?
At very close viewing distances (phones, tablets), higher PPI is clearly better. At typical desktop monitor distances (50-80cm), the difference above 100 PPI is minimal for most users.