DPI calculator from pixels and print size
Enter the long side in pixels and the print size in centimeters — see if resolution is enough for quality output.
Calculator form
How to use
Enter pixels
Long side of your finished file or canvas.
Enter print size
Physical length of that same side in centimeters.
Read DPI
300+ is great up close; 150 works for large posters.
Sample calculations
4000 px → 30 cm
≈ 339 DPI — fine for quality prints
2000 px → 70 cm
≈ 73 DPI — viewing from far away only
Common mistakes
Mistake
Using only the short side → Use the long side or check both dimensions.
Mistake
Expecting upscale to fix DPI → DPI does not add detail — you need pixels upfront.
FAQ
What DPI is “good”?
300 for books and cards; 150–200 for posters; below 100 shows grain up close.
PPI vs DPI?
In digital print workflows people often say DPI for raster density on output.
Formula?
DPI = pixels ÷ (cm ÷ 2.54).
Lock it in with practice
Open the free editor and apply the result — a short sketch beats more reading.