DPI & Print Size Calculator
Convert pixel dimensions and DPI to physical print size (cm/inch). A reference table lists common paper sizes such as A4 at 300 DPI. Everything stays in your browser.
| Paper | Size (mm) | 300DPI (px) | 150DPI (px) |
|---|---|---|---|
| A4 | 210 × 297 | 2480 × 3508 | 1240 × 1754 |
| A5 | 148 × 210 | 1748 × 2480 | 874 × 1240 |
| A6 (postcard) | 105 × 148 | 1240 × 1748 | 620 × 874 |
| L (photo) | 89 × 127 | 1051 × 1500 | 526 × 750 |
| Business card | 91 × 55 | 1075 × 650 | 537 × 325 |
How to Use the DPI & Print Size Calculator
Enter your image's pixel count and the output DPI, or pick an example chip. Inches and cm update together, and the table below shows how many pixels common paper sizes need at each DPI. Handy for checking resolution before sending files to print.
Worked examples
- 3000px @300DPI → prints up to 10.00 in (25.40 cm)
- 2480px @300DPI → 8.27 in (21.00 cm) = exactly A4 width
- 1024px @72DPI → 14.22 in (36.12 cm) = physical size at screen density
- 1500px @150DPI → 10.00 in (25.40 cm) = the same 10 in would need 3000 px at 300 DPI
Before You Print
Use this as a quick preflight check for posters, flyers, photo prints and scanned images. A file can look large on screen but still be too small for high-quality print if the pixel count is low for the chosen DPI.
DPI Does Not Add Image Detail
Here DPI is an output-density assumption: it assigns a number of pixels to each printed inch. Changing only an image file's DPI metadata does not create pixels or detail. Printing the same pixel dimensions at a larger physical size lowers effective pixels per inch and can make the result look softer.
Required resolution depends on the print process, paper, viewing distance, and supplier, so follow the printer's specification instead of treating 300 DPI as universal. Check shape separately with the Aspect Ratio Calculator.