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PIXELVERSE

Screen PPI Calculator

Enter a screen's resolution and diagonal to get its pixel density, dot pitch, physical size, and the distance at which pixels stop being visible.

Display

px
px
in

Examples

Pixel density
108.8PPI

2560 × 1440 on a 27" screen.

Dot pitch
0.2335 mm
Total pixels
3.69 MP
Screen size
59.8 × 33.6 cm
Aspect ratio
16:9
Pixels blend together beyond
80 cm (31.6 in) viewing distance

How to use the screen ppi calculator

  1. Enter the resolution in pixels.
  2. Set the diagonal in inches, as manufacturers list it.
  3. Read the PPI and the details, or start from one of the example displays.

The formula

PPI = √(width² + height²) ÷ diagonal. A 27-inch QHD monitor has √(2560² + 1440²) ≈ 2937 pixels along its diagonal, so 2937 ÷ 27 ≈ 109 PPI.

When pixels disappear

A person with typical sharp vision resolves about one arcminute. The calculator uses that to estimate the distance beyond which neighbouring pixels blend together. A phone needs very high density because it is held close; a television can be far less dense because it is watched from across a room.

Questions

What is a good PPI for a monitor?

Around 100–110 PPI is comfortable at 100% scaling. Around 160–220 PPI looks crisp at 150–200% scaling.

Is PPI the same as resolution?

No. Resolution is the pixel count; PPI is how tightly those pixels are packed, which depends on the screen size.