What is PPI and why does it matter?

PPI stands for Pixels Per Inch — the pixel density of a screen or printed image. Higher PPI means more pixels are packed into each inch, producing a sharper image. Screen displays typically use 72–96 PPI, while quality photo prints require 300 PPI.

How does the Pixels to Inches Converter calculate physical size?

Physical size (inches) = pixel dimension / PPI. For example, a 3,000-pixel-wide image at 300 PPI produces a 10-inch-wide print. The Pixels to Inches Converter also shows the equivalent in centimetres and millimetres.

What PPI should I use for printing?

300 PPI is the standard for photographic-quality prints. 150–200 PPI is acceptable for standard office printing and large-format posters viewed from a distance. 72–96 PPI is appropriate for screen display only.

How do I find my screen's PPI?

PPI = √(width_px² + height_px²) / diagonal_inches. Enter your monitor’s native resolution and measured diagonal size into the screen PPI tab of the Pixels to Inches Converter to find your exact display density.

No. All calculations run entirely in your browser. Nothing is transmitted to a server.

Pixels to Inches Converter

How to Use Pixels to Inches Converter

The Pixels to Inches Converter translates between digital pixel dimensions and physical print sizes in four steps.

Enter the Pixel Dimension — Type the width, height, or both dimensions of your image in pixels.
Enter the PPI — Input the resolution density of the output device (300 for photo print, 96 for standard screen, or a custom value).
Read the Physical Size — The Pixels to Inches Converter displays the result in inches, centimetres, and millimetres.
Find Your Screen PPI — Switch to the screen PPI tab, enter your monitor resolution and diagonal size (in inches), and the tool computes your display’s pixel density.

Formula & Theory — Pixels to Inches Converter

The Pixels to Inches Converter uses the fundamental relationship between pixel count, density, and physical size:

size_in  = pixels / PPI
size_cm  = size_in × 2.54
size_mm  = size_in × 25.4

Screen PPI from resolution and diagonal:

PPI = √(width_px² + height_px²) / diagonal_in

Symbol	Meaning	Unit
pixels	Image dimension	px
PPI	Pixel density	px/in
size_in	Physical dimension	inches
size_cm	Physical dimension	cm
diagonal_in	Screen diagonal (measured)	inches

Common PPI Reference Values

Use Case	Typical PPI
Web / screen only	72–96
Standard office print	150–200
Photo-quality print	300
Fine art / archival	400–600
Retina / HiDPI displays	200–500

Megapixel to Print Size

A 24-megapixel camera producing a 6,000 × 4,000 px image at 300 PPI yields a 20″ × 13.3″ print — the Pixels to Inches Converter makes this calculation immediate.

Use Cases for Pixels to Inches Converter

The Pixels to Inches Converter is used daily by designers, photographers, and developers:

Graphic design — Designers size images for brochures, posters, and packaging by converting pixel dimensions to centimetres or inches before export.
Photography — Photographers estimate the maximum print size before quality degradation occurs by checking pixels-per-inch at the intended print dimensions.
Digital illustration — Artists set canvas PPI correctly in their software and use the Pixels to Inches Converter to confirm the physical output size for clients.
Web development — Developers check image dimensions for Retina/HiDPI displays to ensure images are supplied at 2× or 3× the displayed CSS pixel size.
E-commerce photography — Marketplace platforms specify minimum image dimensions in pixels; sellers use the converter to ensure uploaded images meet requirements.
Presentation design — Converting a 1920 × 1080 px slide to physical inches helps presenters confirm it fills the projected screen at the correct scale.