Image print size calculator

Print size from pixels and DPI, or the pixels needed for a print.

Formula Screens & design

Print width

Print height: ≈ 16.93 cm
Print width in inches: 10.00 in
Print height in inches: ≈ 6.67 in
Megapixels: 6.00 MP

How it works

DPI (dots per inch) sets how many image pixels are printed per inch of paper. Dividing the pixel width by the DPI gives the print width in inches; one inch is exactly 2.54 cm.

To find the pixels needed, the print size in inches is multiplied by the DPI and rounded to the nearest pixel.

Printing at a lower DPI makes a bigger print with less detail. Resizing software cannot add real detail that the original image lacks.

Formula

Print width (in) = pixels ÷ DPI
Print width (cm) = pixels ÷ DPI × 2.54
Pixels = print width (in) × DPI

Worked example

A 3000 × 2000 pixel photo at 300 DPI prints at 10 × 6.67 inches, or 25.4 × 16.93 cm. A 15 × 10 cm print at 300 DPI needs 1772 × 1181 pixels.

Questions people ask

What DPI should I print at?

300 DPI is the usual standard for photos and brochures. Large posters viewed from a distance often look fine at 100 to 150 DPI.

Does changing the DPI setting change the image?

No. The DPI value only tells the printer how large to print; the pixels stay the same unless you resample.