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Print Size (DPI) Calculator

Find the print size for your image at a given DPI.

How it is calculated

Enter the image width and height in pixels and the print resolution in DPI (dots per inch). The tool divides pixels by DPI to get inches and then converts to centimetres: size (cm) = pixels ÷ DPI × 2.54, once for the width and once for the height. A higher DPI packs more pixels into every inch, so the print gets smaller and sharper; a lower DPI gives a larger but softer print. The results are shown to two decimals. Pixels and DPI must all be above zero. The tool does not resample or crop the image and does not know your printer or paper size, so it only gives the size at which your pixels are spread at the DPI you chose.

Worked example

A camera photo is 4000 × 3000 pixels and you want to print it at 300 DPI. Width: 4000 ÷ 300 = 13.33 inches, and 13.33 × 2.54 = 33.87 cm. Height: 3000 ÷ 300 = 10 inches, which is 25.40 cm. At a lower 150 DPI the same file would cover 67.73 cm by 50.80 cm, twice as large in each direction, but with half as many pixels per inch.

Try this example →

Common mistakes

  • Typing the DPI saved in the file's metadata and assuming it limits the print. The pixel count matters; a file labelled 72 DPI prints fine at 300 DPI if it has enough pixels, only smaller.
  • Entering the paper size in the pixel fields. These fields take the image pixels, not the centimetres of the paper.
  • Swapping width and height for a portrait photo, which then gives a landscape size.
  • Expecting a different aspect ratio to fit the paper. A 4:3 image does not fill a 3:2 paper; it needs cropping or leaves white margins.
  • Using 300 DPI for everything. Large posters seen from a distance are often printed at much lower DPI, so a low value can be fine there.

About this calculator

This calculator finds the physical print size of a digital image from its pixel dimensions and print resolution, using size = pixels ÷ DPI (dots per inch), with the result converted to centimetres. DPI here really describes PPI (pixels per inch) at the point of printing — the higher the DPI a print size is calculated at, the smaller and sharper the physical print, since more pixels are packed into each inch; standard practice uses 300 DPI for photo-quality prints viewed up close and drops to 150 DPI or lower for large posters and banners meant to be seen from a distance.

Photographers use it to check whether an image file will print sharp at a chosen size before ordering prints, graphic designers use it to prepare files that meet a print shop's resolution requirements, and photo lab technicians use it to validate customer files ahead of production.

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