DPI Calculator
Runs in your browser — your data is never uploaded.
Work out how large an image prints at a given DPI, and how many pixels you need for a print of a given size. 300 DPI is the usual standard for photographic printing, so a 4-inch print needs 1200 pixels along that edge. The result gives inches, millimetres, and the pixel count required at 300 DPI.
How to use DPI Calculator
- 1
Enter the pixel dimension along one edge of your image.
- 2
Enter the DPI you intend to print at — 300 is standard.
- 3
Read the physical size, and the pixels needed for a sharp print.
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Frequently asked questions
What DPI do I need for printing?+
300 DPI for anything held at reading distance — photos, flyers, business cards. 150 DPI is acceptable for large posters seen from a distance. Below about 150 the pixels become visible up close.
Does changing the DPI setting improve my image?+
No. DPI is a number in the file’s metadata that tells a printer how large to print the existing pixels. It adds no detail. Raising it from 72 to 300 without resampling just makes the print smaller.
Why do people say “72 DPI for web”?+
It is a leftover from early Macintosh displays and means nothing on the modern web — browsers only care about pixel dimensions. Set image size in pixels and ignore the DPI field entirely for screen work.