How to convert pixels to centimeters and inches
Quick answer
To convert pixels to centimeters, divide the pixels by the DPI to get inches, then multiply by 2.54. At 300 DPI, 1 cm is about 118 pixels, and the Pixel, cm and inch converter does the sum for any length and resolution.
Open Pixel, cm and inch converter
Steps
- Open the Pixel, cm and inch converter and type the length you have.
- Choose its unit: pixels, centimeters, millimeters or inches.
- Choose the resolution in DPI. Use 300 for print photos and 72 or 96 for screens.
- Read the same length in every unit, and the pixel sizes of common paper.
Why DPI matters
Pixels have no physical size on their own. The same 1200 pixels are 4 inches wide at 300 DPI and about 16.7 inches wide at 72 DPI. DPI says how many pixels fit in one inch.
For printing, 300 DPI is the usual target for photos. 150 DPI is fine for drafts, and screens only care about the pixel count.
Common sizes in pixels
At 300 DPI an A4 page is 2480 by 3508 pixels, and a 4 by 6 inch photo print is 1200 by 1800 pixels. The table on the page shows A4, A5, A3, US Letter and passport photos at the DPI you choose.
Changing the DPI setting of a file does not change its pixels. To change the real size of a picture, use the Resize images tool.
Common questions
How many pixels is 1 cm?
At 300 DPI it is about 118 pixels, and at 96 DPI about 38 pixels. The formula is pixels = cm divided by 2.54, times DPI.
How many pixels is an A4 page?
At 300 DPI, A4 is 2480 by 3508 pixels. At 150 DPI it is 1240 by 1754.
Does this change my picture?
No. It is only a calculator and uses no file.
Written by Basic App Company. Last checked against the tool on 12 Nov 2026. The tool runs in your browser, so your pictures are not uploaded.