cm to pixels calculator
Enter a final print size in centimetres or inches and get the required pixel dimensions for your chosen PPI/DPI.
Formula for cm to pixels
To convert centimetres to pixels, first convert centimetres to inches, then multiply by the target PPI/DPI.
pixels = (centimetres / 2.54) x PPI · pixels = inches x PPI
Use the right aspect ratio
A 6 x 4 inch print is 3:2. At 300 PPI it needs 1800 x 1200 px. If your image has a different ratio, the print lab must crop it, add borders or distort it.