PPI Calculator
Free CalculatorTurn your screen resolution and diagonal size into pixels per inch — the pixel density that decides how crisp your assets look.
100% private
Runs in your browser — no numbers leave your device.
Your screen
Screen width in pixels — the horizontal resolution.
Screen height in pixels — the vertical resolution.
Diagonal screen size in inches, corner to corner.
Pixels per inch (PPI)
505
Pixel density of the screen — higher PPI means sharper text and images.
Diagonal resolution (px)
3,079
The diagonal pixel count, √(width² + height²).
How it works
Enter resolution
Add the screen width and height in pixels.
Add diagonal size
Enter the diagonal screen size in inches.
We do the maths
We find the diagonal pixel count, then divide by inches.
Read your PPI
Pixel density and diagonal resolution update live.
Design assets that stay razor-sharp
Reverze rebuilds your App Store screenshots at pixel-perfect density for every device.
What is a PPI calculator and how do you calculate PPI?
PPI, or pixels per inch, measures the pixel density of a display — how many pixels are packed into each linear inch of the screen. A PPI calculator turns three numbers into that density: the screen's width in pixels, its height in pixels, and its diagonal size in inches. It first finds the diagonal resolution with the Pythagorean theorem — √(width² + height²) — then divides that pixel count by the diagonal size in inches to give you the PPI.
Pixel density matters because it decides how crisp your text, icons and screenshots look. A higher PPI packs more detail into the same physical space, so assets exported at too low a resolution appear soft or pixelated on dense modern displays. Knowing the target device's PPI helps you design and export App Store creative at the right resolution — exactly what Reverze automates so every screenshot stays razor-sharp across iPhone, iPad and Android.