Pixel To Centimetre Calculator

Work out pixel to centimetre instantly with clear inputs, formula shown and shareable results.

About Pixel To Centimetre Calculator

Pixels only have a physical size once a resolution is specified: length in inches is pixels divided by dpi. At the CSS default of 96 dpi, 1920 pixels is 20 inches or 50.8 cm; at 300 dpi print resolution the same pixel count is only 16.3 cm. That is why images must be sized in pixels for a target dpi.

Formulas

Physical length

inches = pixels / dpi

Metric

cm = inches x 2.54

Worked example

With the default values below, Pixel To Centimetre Calculator returns Physical Size of 50.800. Change any input above and every figure here is recalculated in your browser.

Inputs used

Pixel dimensionminimum 0 px: 1,920 px
Resolutionminimum 0 dpi: 96 dpi

Results

Physical Size: 50.800 cm
Same Size In Millimetres: 508.00
Same Size In Inches: 20.0000
Equivalent In Typographic Points: 1,440.00

Step by step

1Values used
2Physical length
3Metric
4Physical Size= 50.800 cm
5Same Size In Millimetres= 508.00
6Same Size In Inches= 20.0000
7Equivalent In Typographic Points= 1,440.00

Assumptions and limits

The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why is 96 dpi the web default?

It was the nominal resolution of early Windows displays and became the CSS reference, so 1 CSS pixel is defined as 1/96 inch.

How many pixels do I need for an A4 print?

At 300 dpi, 2480 by 3508 pixels. Below about 200 dpi the pixel structure becomes visible at reading distance.