Gifs Calculator
Image Size & Print Size Calculator works out Print width and Print height from What to work out, Image width and Image height. The default figures on this page give print width of 10.000 in; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
3 steps
- At 300 ppi, 3000 x 2400 px prints 10 x 8 in (25.4 x 20.32 cm).
- That is 7.2 megapixels at an aspect ratio of 5:4.
- Capacity: 64 GB = 64000 MB; floor(64000 / 25) = 2560 photos.
Its 4 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
3 sources
What the Image Size & Print Size Calculator calculates
Converts between image pixel dimensions, print size in inches or centimetres and pixel density, and works out how many photos of a given file size fit on a memory card.
How to use this Image Size & Print Size Calculator
Enter What to work out, Image width, Image height and Pixel density to print at. Print width updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Print width, Print height and Pixel density.
The method follows Definition of pixel density: ppi = pixels / inches of print, IEC 80000-13 decimal capacity units (1 GB = 1000 MB) as used by card manufacturers and Researched engineering contracts R789 (IMAGE-DPI), R799 (PRINT-SIZE) and the PHOTO-CAPACITY contract.
Research fixture R799-GT-1: 3000 x 2400 px at 300 ppi example
With Image width: 3000, Image height: 2400, Pixel density to print at: 300, the calculator returns Print width: 10, Print height: 8. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Print width, Print height and Pixel density. The inputs you can vary are What to work out, Image width, Image height, Pixel density to print at, Pixels along one edge and Print length of that edge.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
What information do I need for the Image Size & Print Size Calculator?
You need What to work out, Image width, Image height, Pixel density to print at, Pixels along one edge, Print length of that edge, Card capacity and Size of one photo. The page opens with default figures that give print width of 10.000 in, so you can see the scale before entering your own.
What does this Image Size & Print Size Calculator show?
It shows Print width, Print height, Pixel density, Megapixels, Aspect ratio, Photos that fit on the card and Card capacity, with the working and any warnings for your entries.
Can I check how the Image Size & Print Size Calculator result was calculated?
Yes. The “How this is worked out” section shows the calculation steps, and the sources section identifies the references used for the method.