The useful equation
Width in inches equals pixel width divided by pixels per inch. Apply the same calculation to height. For centimeters, multiply inches by 2.54. This is a relationship between file dimensions and physical size, not a promise of visual quality. Enter the resolution your printer recommends for the intended process. If that recommendation is missing, ask before purchasing enhancement solely to reach a familiar number. Our calculator uses your inputs locally and uploads no image.
Work in both directions
To find a required file size, multiply the desired width and height in inches by the target PPI. Round required pixel dimensions upward when you need whole pixels. A 10 by 15 inch image at 240 PPI needs 2400 by 3600 pixels. A 10 by 15 inch image at 300 PPI needs 3000 by 4500 pixels. The arithmetic changes with the requirement; neither calculation establishes which specification is appropriate for your printer or viewing distance.
A crop changes the answer
Suppose the original is 3000 by 4500 pixels but you crop it to 2400 by 3000. At 300 PPI that remaining area corresponds to 8 by 10 inches, not 10 by 15. Using the original dimensions in a sizing calculator would overstate the available detail. Save the actual cropped dimensions from the editor. If the intended print is larger, compare a less aggressive crop, a smaller print or an enhancement candidate. Do not stretch one dimension simply to make the numbers fit.
What the tool cannot decide
The calculator cannot inspect blur, compression, invented detail, rights or color. It also does not add printer-specific bleed automatically. Treat its result as a sizing checkpoint followed by visual and receiving-specification checks. Preserve the original dimensions and the chosen target in a brief. That small record makes later handoffs easier: another person can see why the export has its dimensions instead of guessing from a filename such as final-large-new.
Sources used for this page
These records support the facts and comparisons above. Merchant-controlled records are labelled so you can separate product claims from independent evidence.
- Adobe image size and resolution reference — Merchant documentation · helpx.adobe.com · Merchant-controlled · checked 2026-09-25
- Let's Enhance print-preparation help (September 16, 2026) — Merchant documentation · help.letsenhance.io · Merchant-controlled · checked 2026-09-25