How to calculate print size
Divide the image width and height in pixels by the desired pixels per inch. For example, 1,800 × 1,200 pixels at 300 PPI gives a 6 × 4 inch print (15.24 × 10.16 cm).
Fit or fill?
Fit keeps the entire image but may leave margins. Fill covers the print while cropping the excess. For 1,800 × 1,200 pixels on an 8 × 10 inch portrait print, fit gives 225 PPI and margins; fill gives 120 PPI and crops 840 pixels from the width in total.
How many pixels do I need?
Multiply the desired size in inches by the target PPI. This tool rounds up to a whole pixel so the requested PPI is not undershot. One inch equals 2.54 centimetres or 25.4 millimetres.
Frequently asked questions
Does changing PPI increase detail?
No. It changes the calculated physical print size. Adding pixels requires resampling, which cannot recover detail that was never captured.
Is 300 PPI always required?
No. Suitable resolution depends on the image, print process and viewing distance. Ask your print provider for its requirements.
Does the image leave my device?
No. The optional image is opened locally to read the dimensions supported by your browser. No image is sent to UVs Tool Hub by this tool.
Why are width and height PPI different?
The image and print aspect ratios differ. Stretching to fill changes proportions; use the fit and fill results to compare options.