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Print Size Calculator — Pixels to Inches & cm
This print size calculator turns pixel width, pixel height, and DPI into physical print dimensions. Results show centimeters first, then inches — no signup and no server.
Updated October 2026
Will my phone photo print well at 8×10?
An 8×10 inch print at 300 DPI needs about 2400×3000 pixels, so a 12 megapixel phone photo usually clears that bar when you print at photo-lab quality.
Enter your exact pixel dimensions above at 300 DPI and compare the inch or cm output to 20.3×25.4 cm (8×10 inches). If the numbers are smaller, the print size calculator is telling you the photo will print smaller than 8×10 unless you lower DPI or upscale (which softens detail).
Not sure of your pixel size yet? Drop the file on the image size checker first — it links back here with width and height filled in.
The math
Print size uses S = P ÷ PPI: divide each pixel edge by the pixels-per-inch (DPI) value to get inches, then multiply inches by 2.54 for centimeters or by 25.4 for millimeters.
Example one: a 3000×2400 px photo at 300 PPI prints at 10×8 inches (3000÷300 and 2400÷300). Example two: the same idea at a lower density — 4000×3000 px at 150 PPI prints at 26.67×20 inches (4000÷150 and 3000÷150).
Print size at your DPI
Higher DPI spreads the same pixels over a smaller sheet, which looks sharper up close.
Use the preset buttons for 72, 150, 300, and 600 DPI to see how a social-media export differs from a lab print. The formula stays pixels ÷ DPI = inches; centimeters follow by multiplying inches by 2.54.
DPI by viewing distance
Viewing distance determines how many dots per inch your eyes can resolve.
| Viewing context | Typical DPI |
|---|---|
| Billboard (far away) | 15–30 DPI |
| Poster on a wall | 100–150 DPI |
| Photo held at arm’s length | 250–300 DPI |
| Fine art print inspected closely | 300–600 DPI |
For the definition of dots per inch, see the Dots per inch article on Wikipedia.
Compare common print sizes
Lab sizes below assume 300 DPI so you can compare pixel requirements at a glance.
| Print size (inches) | Pixels needed @300 DPI |
|---|---|
| 4 × 6 | 1200 × 1800 |
| 5 × 7 | 1500 × 2100 |
| 8 × 10 | 2400 × 3000 |
| 11 × 14 | 3300 × 4200 |
| 16 × 20 | 4800 × 6000 |
| 20 × 30 | 6000 × 9000 |
Frequently asked questions
How does a print size calculator work?
Enter pixel width, pixel height, and DPI. The print size calculator divides pixels by DPI to get inches, then multiplies by 2.54 for centimeters. SnapShrink shows centimeters first, then inches.
Will my phone photo print well at 8×10?
An 8×10 inch print at 300 DPI needs about 2400×3000 pixels. Type your phone photo’s pixel dimensions into the calculator at 300 DPI and compare the inch/cm result to 8×10.
Which DPI should I use for printing?
Use 300 DPI for photo prints viewed at arm’s length, 150 DPI for large posters seen from farther away, and 72 DPI only for draft proofs. The calculator includes preset buttons for each.
Is this print size calculator free?
Yes. The print size calculator is read-only math in your browser with no paywall counter and no file upload. Change numbers as often as you like.
Can I increase DPI without resizing the image?
No. DPI is metadata that reinterprets existing pixels on paper. Raising DPI without adding pixels makes the print smaller; you cannot invent detail by changing DPI alone.
Ready to shrink files for the web?
Compression is separate from this calculator — still 100% in-browser.