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.
Examples (click to try)
—
inches
—
cm
| 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.
FAQ
Is my data sent to a server?
No. Everything runs in your browser; nothing is transmitted or stored externally.
What is the formula?
inches = pixels ÷ DPI; cm = inches × 2.54. Since 1 inch = 25.4 mm, you can also get mm = inches × 25.4.
What DPI should I print at?
Use about 300 DPI for normal prints, around 150 DPI for large posters viewed from a distance, and 72–96 DPI for screen display. For example, printing A4 at 300 DPI needs roughly 2480×3508 px.
What is the largest size I can print from my image?
Enter your pixel count and the target DPI (300 for print) to see the printable size in cm/inch. Example: 3000 px @ 300 DPI prints up to 10 inches (25.4 cm). Enlarging beyond that looks soft.