PPI Calculator
Calculate screen pixels per inch (PPI), dot pitch, total pixels, and aspect ratio from resolution and diagonal size. Supports inch and cm input — 100% in-browser.
Loading tool...
What is PPI Calculator?
A PPI Calculator determines the pixel density of a display by dividing its diagonal resolution in pixels by the physical diagonal size in inches. The result — pixels per inch (PPI) — measures how tightly packed the pixels are, which directly affects perceived image sharpness. The tool also reports dot pitch (the physical size of one pixel in millimeters), total pixel count, aspect ratio, and a display quality category. Everything is calculated locally in your browser, so no data leaves your device.
Key Benefits
- Instant PPI, dot pitch, and total pixel calculation from resolution and diagonal
- Supports both inch and centimeter diagonal input with automatic conversion
- Reduced aspect ratio via GCD plus exact decimal ratio
- Display category from very low density to Retina / print quality
- 100% client-side — no server, no upload, no tracking
Common Use Cases
- •Comparing screen sharpness when shopping for monitors, phones, or TVs
- •Verifying that a display meets Retina-class density for UI and graphic design
- •Display engineering and procurement — dot pitch and pixel area calculations
- •QA testing of display panels and verifying advertised resolution
How to Use the PPI Calculator
- Enter screen resolution: Type the display width and height in pixels, e.g. 1920 × 1080 for Full HD or 2560 × 1440 for QHD.
- Enter diagonal size: Input the physical diagonal size of the screen. Toggle between inches and centimeters — the tool converts automatically.
- Read the results: The calculator instantly shows PPI, dot pitch in millimeters, total pixel count, and the reduced aspect ratio.
- Check the display category: Review the category label (Retina, high density, standard, low, or very low) to gauge perceived sharpness at normal viewing distance.
Key Features
- Instant PPI calculation from screen width, height, and diagonal size.
- Dot pitch in millimeters for precise physical pixel dimensions.
- Supports both inch and centimeter diagonal input with automatic conversion.
- Reduced aspect ratio via GCD (e.g. 16:9) plus exact decimal ratio.
- Display category classification from very low density to Retina / print quality.
- 100% client-side — no server, no upload, no tracking.