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Pixels to Print Size Calculator

See how big your photo will actually print before you send it.

How it is calculated

The tool converts one side of an image from pixels into a physical length. It divides the pixel count by the print resolution: inches = pixels ÷ DPI, then converts to centimetres with cm = inches × 2.54. Pixels is the number of pixels along the side you care about (width or height), and DPI is the dots (pixels) per inch the printer will use. Both results are shown with two decimals. Pixels and DPI must both be above zero. The tool handles one dimension per run, so enter the width and then the height to get the whole print size. It does not resample or crop the file; it only tells you how large the image prints at that density.

Worked example

A photo is 4000 pixels wide and you plan to print it at 300 DPI. Divide: 4000 ÷ 300 = 13.33 in. In centimetres: 13.33 × 2.54 = 33.87 cm. If you printed the same width at 150 DPI instead, 4000 ÷ 150 = 26.67 in (67.73 cm): the print is twice as wide, but the pixels are spread twice as thin, so it looks softer from close up.

Try this example →

Common mistakes

  • Entering the width and height pixels together. Each side needs its own run, since only one pixel count is read at a time.
  • Using the screen resolution (72 or 96) as DPI for a printed photo. That gives an enormous print that will look soft; printers usually want a much higher figure.
  • Treating the file's DPI tag as a quality measure. The tag is only a label; the pixel count and the DPI you choose decide the print size.
  • Forgetting that a larger print needs fewer DPI only because it is viewed from further away, not because it looks sharper from close.

About this calculator

An image's printed size depends on the relationship between its pixel dimensions and the printing resolution: print size (inches) = pixel dimension ÷ DPI (dots per inch). A 3000×2000 pixel photo printed at 300 DPI — the standard for sharp photo prints viewed up close — comes out to 10×6.67 inches, but the same file printed at 150 DPI stretches to 20×13.3 inches, covering more area with the same pixels spread thinner, which is why low-DPI enlargements look soft or pixelated up close even though nothing was lost from the file.

Photographers and print shops use this calculation to confirm a file has enough resolution before committing to a print size — sending a phone screenshot to be printed poster-size without checking DPI is a common and costly mistake — and graphic designers use it when preparing files for magazines, packaging or signage, where the required DPI varies by viewing distance (300 DPI for close-up prints, but billboards viewed from a distance can use far lower DPI and still look sharp).

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