Creative Tools
Large Format Print Calculator
Enter the image pixels, the file’s current DPI, the print size you want, and the printer’s minimum DPI.
How big can this image go?
Large-format jobs are limited by how many pixels you actually have, not by the DPI number saved in the file. A 3000 × 2000 px image at 300 DPI is only 10 × 6.7 inches at that setting. Stretch it toward a poster and the effective DPI falls, because the same pixels cover more inches. Enter the pixel size, the file’s current DPI, the print size you want, and the minimum the printer asked for — 100 DPI is a common large-format floor for work viewed at a distance. The result is the effective pixels-per-inch at that target, plus the largest width and height that still meet the minimum. Related checks: print size for pixels-to-paper, and DPI calculator when you already know the finished size and only need the rate. Soft files and heavy compression still look soft at a passing DPI.
Worked example
3000 × 2000 px, file set to 300 DPI, so it currently prints at about 25.4 × 16.9 cm. A 90 × 60 cm target is about 85 px/in on both axes. If the printer wants at least 100 px/in, that target is too big. The largest size at 100 px/in is 76.2 × 50.8 cm (30 × 20 in).
Limits and assumptions
Does not judge sharpness, noise or viewing distance. Some bureaus accept under 100 DPI for graphics seen from several metres. Not a colour-management or RIP check.
Frequently asked questions
What does effective DPI mean?
Pixels along that side divided by the target length in inches. It is pixels per inch at the size you asked to print, not a length.
Why enter the file’s current DPI?
It shows the size the file is prepared to print at today. Scaling larger uses the same pixels, so the effective DPI drops.
What is the largest size?
Pixel width and height divided by the minimum DPI. That is as big as the image can go while staying at the printer’s floor.
What if width and height disagree?
The lower figure is the one that will look softer. Match the target shape to the image, or crop, before you judge the job.
Is 100 DPI always enough?
It is a common large-format minimum for distant viewing. Close-up photo prints usually want nearer 150–300.