DPI & Print Size Calculator
Convert image pixels to physical print dimensions at your chosen resolution. Or enter a print size to find the pixels needed. Optionally select an image to fill in its width and height without uploading it.
Calculate pixels for a target print size
Enter your desired physical print dimensions. The calculator shows the pixels needed at the selected PPI and the effective PPI of your current image when printed at that size.
PPI is a print-size calculation, not a measurement of the image file's embedded DPI metadata. This tool does not change image pixels, metadata or files.
How to calculate image print size
Divide the pixel width and height by the print resolution in pixels per inch (PPI). For example, a 2400 × 3000 pixel image printed at 300 PPI measures 8 × 10 inches. Multiply inches by 2.54 for centimetres, or 25.4 for millimetres.
How many pixels do I need for printing?
Multiply the desired print width and height in inches by the target PPI. An 8 × 10 inch print at 300 PPI requires 2400 × 3000 pixels. Higher print resolution requires more pixels at the same physical size.
DPI versus PPI
PPI describes the number of image pixels per printed inch. DPI technically refers to printer dots per inch, though the terms are often used interchangeably in print instructions. This calculator uses PPI for image-to-print conversions; it does not read or rewrite embedded DPI metadata.
Does changing the PPI setting improve image quality?
No. Changing the target PPI in this calculator changes the computed physical print size, not the number of pixels in your file. Enlarging a small image may require resampling and can reduce visible sharpness.
What print resolution should I choose?
300 PPI is a common target for close-viewed photo prints, while lower effective resolutions may be suitable for larger prints viewed from farther away. Follow the requirements of your print provider or document submission system.