PPI Calculator
Work out a display's pixel density (PPI) from its resolution and diagonal size. Enter the width, height and screen size to get PPI and the dot pitch.
px
px
in
Pixel density141,2 PPI
- Dot pitch
- 0,18 mm
Come funziona
Pixels per inch (PPI) measures how densely packed a screen's pixels are — higher PPI means a sharper image. It is found from the diagonal resolution in pixels divided by the diagonal size in inches. The diagonal pixel count comes from the Pythagorean theorem: the square root of width squared plus height squared.
Dot pitch is the flip side: the distance between neighbouring pixels in millimetres, calculated as 25.4 (mm per inch) divided by PPI. Phones today reach 400–500+ PPI, while typical desktop monitors sit around 90–160 PPI.
Esempi
- A 1920×1080 15.6-inch laptop is about 141 PPI.
- A 2532×1170 6.1-inch phone is about 460 PPI.
- Higher PPI means individual pixels are harder to see.
Domande frequenti
- What is PPI?
- Pixels per inch — how many pixels fit into one inch of the screen. It describes pixel density and therefore sharpness.
- How is PPI calculated?
- Divide the diagonal resolution (√(width² + height²) in pixels) by the diagonal screen size in inches.
- What is dot pitch?
- The distance between adjacent pixels in millimetres, equal to 25.4 divided by the PPI. Smaller dot pitch means a finer image.
- Is higher PPI always better?
- Higher PPI is sharper, but beyond what the eye can resolve at normal viewing distance the benefit fades while cost and power use rise.