How this calculator works
Large posters are commonly viewed from farther away, so a lower PPI can still appear sharp. This tool reports the true value instead of applying one universal quality claim.
effective PPI = image pixels ÷ poster inches
Frequently asked questions
Is 150 PPI enough for a poster?
It can be appropriate for larger prints viewed from a normal distance. Close-viewed fine art may require more.
Does the tool support A-series posters?
Yes. A4 through A0 are included alongside 12×18, 18×24, and 24×36 inch formats.
Does it account for orientation?
Yes. It compares portrait and landscape and uses the orientation with the stronger effective PPI.