Pixel & DPI calculator
Convert mm, cm, inches, and pixels to check the resolution an image needs.
How to calculate pixels and print size
- Choose a direction and unit.
- Enter width, height, and resolution.
- Copy the result or continue to the image resizer.
Print size and pixels
Required pixels equal the length in inches multiplied by the selected resolution. A4 at 210 × 297 mm and 300 PPI is about 2480 × 3508 pixels.
Continue with the actual image
If the calculated size exceeds your source photo, enlarging cannot invent real detail. Compare the values first, then continue to the image resizer.
FAQ
Are DPI and PPI the same?
They describe different things, but this calculator treats the entered resolution as pixels per inch for image-size conversion.
Does calculating resize my photo?
No. Use the button below the result to open the resizer with the calculated dimensions.