Pixels have no fixed physical size; centimetres depend on density. Divide the pixel count by the pixels per inch, then multiply by 2.54. At 300 PPI, 1,000 px is 1000 ÷ 300 × 2.54 = 8.47 cm. On a CSS screen layout (96 px per inch), 96 px equals 2.54 cm.
Designers sizing a print, photographers checking how large a crop will come out, and developers translating a mockup measured in centimetres all hit the same question: how long is this many pixels? The answer depends entirely on the density the pixels are laid out at. Enter a pixel length and a density in pixels per inch, and the tool returns the length in centimetres, with millimetres, inches and pixels per centimetre alongside and the two-line working. Use 300 for photo-lab and offset printing, 150 for large posters seen from a distance, and 96 for CSS. One limit: the result describes how the file will be sized, not how a particular monitor shows it, because physical screen pixel sizes vary from device to device.
Type the width or height of the image, crop or element in pixels.
Enter the PPI you will print at, or 96 for CSS layout measurements.
The centimetre figure updates as you type, with millimetres, inches and px per cm below it.
Result Length: 2.54
Millimetres: 25.4
Inches: 1
Pixels per centimetre: 37.8
CSS defines 96 pixels per inch, so 96 px measures exactly one inch, 2.54 cm.
Result Length: 8.47
Millimetres: 84.7
Inches: 3.333
Pixels per centimetre: 118.11
A 1,000-pixel edge printed at photo-lab density covers about 8.5 cm.
Result Length: 32.51
Millimetres: 325.1
Inches: 12.8
Pixels per centimetre: 59.06
Halving density from 300 to 150 PPI doubles the printed size; 1920 px spans 32.5 cm.
cm = px ÷ PPI × 2.54
pxPPI2.54Dividing pixels by pixels per inch gives the physical length in inches; multiplying by 2.54 turns inches into centimetres. Pixels per centimetre is the density divided by 2.54, so 300 PPI is about 118.11 px per cm. CSS fixes its reference pixel at 1/96 inch, which is why 96 px is treated as 2.54 cm in browsers and print stylesheets.
At 96 PPI one pixel is 0.0265 cm (0.265 mm). At 300 PPI it is 0.00847 cm. A pixel only gets a size once you pick a density.
For sizing, yes. PPI counts image pixels per inch; DPI strictly counts printer ink dots, which are often several per pixel. Software and print shops commonly write DPI when they mean PPI, and either number works in this formula.
300 PPI is the usual target for prints viewed at arm's length. Posters seen from a metre or more look fine at 150 PPI, and banners viewed across a room can go lower.
The W3C defines the CSS reference pixel so that 1in equals 96px and 2.54cm. Browsers keep this ratio for layout and print stylesheets, even though the physical size on a given screen varies.
Reverse the formula: pixels = cm ÷ 2.54 × PPI. A 10 cm edge at 300 PPI needs 10 ÷ 2.54 × 300 ≈ 1,181 px.
Not if resampling is off. The pixel count stays the same and only the stated physical size changes, which is exactly what this calculation shows.
Using this tool in an assignment, article or report? Copy a citation, or a link for your website.
Tools Directory Editorial Team. (2026, October 27). Pixel to CM. Tools Directory. Retrieved October 27, 2026, from https://tools.milunir.com/photography/image-size-and-print/pixel-to-cm/
Tools Directory Editorial Team. “Pixel to CM.” Tools Directory, 27 Oct. 2026, https://tools.milunir.com/photography/image-size-and-print/pixel-to-cm/. Accessed 27 Oct. 2026.
Tools Directory Editorial Team. “Pixel to CM.” Tools Directory. Last modified October 27, 2026. Accessed October 27, 2026. https://tools.milunir.com/photography/image-size-and-print/pixel-to-cm/.
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