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Resolution px to cm

Convert pixel dimensions into physical centimetres and inches at a given pixels-per-inch value.

Built and maintained by The NumberPrism Editorial TeamEditorial policy

Your details

Image width (pixels)

Image height (pixels)

Pixel density (PPI)

PPI

96 PPI is the CSS reference; phone screens are usually far higher.

Results update as you type. The formula and assumptions are explained below the calculator.

Physical width

50.8 cm

Physical height28.58 cm

Size in inches20 × 11.25 in

Diagonal22.95 in (58.3 cm)

Total pixels2,073,600 px

Assumes the image is shown at its native pixel count. At a different PPI the physical size scales inversely, so double the PPI halves the printed size.

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What does this tool do?

A screen or print has no physical size until a pixel density is chosen. This converter applies the PPI value to both dimensions and gives the diagonal in centimetres and inches.

The Formula

Centimetres = Pixels ÷ PPI × 2.54; diagonal = √(width² + height²) ÷ PPI

Frequently Asked Questions

What PPI should I use for a screen?

Use the display's actual pixel density, often 96 PPI for older desktop monitors and 220–460 PPI for phones. The manufacturer's specification gives the exact figure.

Why does the same image print at different sizes?

Physical size is set by the output density. The same 1,920-pixel width is 20 inches at 96 PPI but only 6.4 inches at 300 PPI.

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