How this calculator works
Use this converter before creating a print document. Choose the final physical size and output resolution to calculate the pixel canvas required for the job.
How to use the CM to Pixels Converter
- Enter the intended print width and height in centimeters.
- Select a target PPI based on viewing distance and print quality.
- Create or export the artwork using the calculated whole-pixel dimensions.
Worked example
A 21 × 29.7 cm A4 document requires approximately 2480 × 3508 pixels at 300 PPI before bleed is added.
Accuracy note: Always confirm whether the printer wants trim dimensions or a larger canvas that includes bleed.
Frequently asked questions
How many pixels are in 1 cm at 300 PPI?
One centimeter requires approximately 118.11 pixels at 300 PPI.
Should I round pixel dimensions?
Yes. Pixel dimensions must be whole numbers, so this tool rounds to the nearest pixel.
Is 300 PPI always required?
It is a common high-quality target for close viewing. Posters viewed from farther away may work at 150 or 220 PPI.
From a print size to a usable pixel target
Example: A4 is 21 × 29.7cm. At 300 PPI the untrimmed target rounds to 2480 × 3508 pixels. Rounding to whole pixels is expected because an image cannot contain part of a pixel.
What can make this result wrong for a job?
- Entering the finished trim size when the printer expects bleed in the supplied file.
- Stretching an image with a different aspect ratio instead of cropping it.
- Assuming 300 PPI is mandatory for every format; distant-viewed posters may use a lower target if the printer approves it.
Use the 3mm Bleed Calculator when artwork reaches the edge, the A4 Pixels Calculator for an A4 preset, or the Business Card Pixel Size Calculator for regional card dimensions.
Method checked: August 9, 2026. Confirm dimensions, bleed, color space, and export settings against the provider's template.