Pixels to cm and cm to pixels: free converter with mm and inches
Convert pixels to centimetres, millimetres or inches at any DPI. Both directions, instant math.
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Pixels to centimetres and millimetres
Convert pixels to cm, mm or inches at any DPI — and back. Check that your photo file really matches the printed size. The formula is shown on the page.
- 01
Type a value in any unit (px, cm, mm, in).
- 02
Pick your DPI (300 is the safe default).
- 03
Read the converted value in the other units.
Calculating is free. A document photo — by the AI
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Make a document photoFrequently asked questions about document photos
What's the formula for pixels to cm?
cm = (pixels ÷ DPI) × 2.54. Example: 1200 pixels at 300 DPI = (1200 ÷ 300) × 2.54 = 10.16 cm.
And mm to pixels?
pixels = (mm ÷ 25.4) × DPI. Example: 35 mm at 300 DPI = (35 ÷ 25.4) × 300 ≈ 413 pixels.
Why does the result have decimals?
Pixels are integers but the conversion factor (25.4 mm per inch) isn't. We round the pixel output to the nearest integer (since you can't have a fractional pixel) and show physical dimensions to 0.1 mm.