Photo print size from pixels
Your 24.0 MP photo prints at 500 ppi on that sheet and its pixels stop showing from about 0.6 ft away.
Result
Resolution on your print
ppi
Pixels stop showing from
ft
- The photo and the sheet have different shapes, so part of the photo is cut off. The resolution shown is for the side that has to fill the sheet.
| Print side matched to the photo width, in inches | 0.8 ft |
|---|---|
| Print side matched to the photo height, in inches | 0.7 ft |
| Pixels per inch across the width | 600.0 ppi |
| Pixels per inch down the height | 500.0 ppi |
| The smaller of the two (the photo must cover the sheet) | 500.0 ppi |
| Distance at which one pixel spans one minute of arc | 0.6 ft |
How it works
A print is sharp when the photo has enough pixels for every inch of paper. The tool divides the pixels along each side by the inches of the print and keeps the smaller figure, because the photo has to cover the whole sheet. It then shows the largest print at four common quality levels, from a print held in the hand to a wall print viewed from a few feet. The viewing distance follows from the sharpness of the eye: a pixel is no longer seen as separate once it is smaller than one minute of arc. Enter the pixel size of a 12 megapixel photo, such as 4000 × 3000, and the tool shows the max print size at each quality level.
Formula
Orient the print: if the photo is landscape and the print portrait (or the reverse) swap print_w and print_h. In inches, pw = print_w / 0.0254 and ph = print_h / 0.0254. The photo must cover the print, so the pixels per inch is ppi = min(px_w / pw, px_h / ph). The largest print at N pixels per inch is px_w / N wide and px_h / N high (N = 300, 200, 150, 100). A pixel stops being resolved when it subtends one minute of arc: distance = 1 / (ppi x tan(1 arcmin)) inches. megapixels = px_w x px_h, returned in px (the MP display unit divides by 1,000,000). tan(1 arcmin) = tan(pi / 10800). The warning w_cropped appears when px_w / pw and px_h / ph differ by more than 1 %.
Worked example
The tool opens with this example; the result above is computed from it.
| Input | Value |
|---|---|
| Photo width in pixels | 6,000 px |
| Photo height in pixels | 4,000 px |
| Print width | 10 in |
| Print height | 8 in |
| Resolution on your print | 500 ppi |
| Pixels stop showing from | 0.6 ft |
Common cases
| Case | Starting values | Resolution on your print | Pixels stop showing from |
|---|---|---|---|
| Twelve megapixel photo on eight by ten | Photo width in pixels 4,000 px; Photo height in pixels 3,000 px; Print width 10 in; Print height 8 in | 375 ppi | 0.8 ft |
| Phone photo as a wall print | Photo width in pixels 4,032 px; Photo height in pixels 3,024 px; Print width 24 in; Print height 18 in | 168 ppi | 1.7 ft |
| Web-size image as a postcard | Photo width in pixels 1,200 px; Photo height in pixels 800 px; Print width 6 in; Print height 4 in | 200 ppi | 1.4 ft |
| Camera photo as a large canvas | Photo width in pixels 6,000 px; Photo height in pixels 4,000 px; Print width 36 in; Print height 24 in | 167 ppi | 1.7 ft |
Questions and answers
What size can I print a twelve megapixel photo?
A photo of 4,000 px by 3,000 px on a 10 in by 8 in sheet comes out at 375 ppi, which holds up from about 0.8 ft away. The largest print at the hand-held standard is 13.3 in by 10.0 in, and 26.7 in by 20.0 in for a print seen from two to four feet.
Can I print an image from a website?
A web image of 1,200 px by 800 px gives only 200 ppi on a 6 in by 4 in postcard, and its pixels show from 1.4 ft away. For a sharp postcard you want the original photo, not the web copy.
How big can I print a twenty-four megapixel photo?
A photo of 6,000 px by 4,000 px prints at 167 ppi on a 36 in by 24 in canvas, and the pixels stop showing from about 1.7 ft. The largest print at the hand-held standard is 20.0 in by 13.3 in.
Assumptions and limits
- The photo is scaled to cover the whole sheet, so a different shape means a crop; the resolution is that of the limiting side.
- The viewing distance assumes eyesight that resolves one minute of arc, the usual definition of normal vision; many people see a little less or more.
- The four quality levels are guide values for how far away a print is viewed. They are conventions, not limits of a printer.
- Inches are international inches, the common standard for print sizes.
The result is an estimate for planning, not professional advice.
Sources
- Dots per inch (Wikipedia): PPI is the input resolution of an image; a 1,000 x 1,000 px image at 250 PPI prints at 4 x 4 inchesretrieved 2026-10-13
- DPI to pixels reference table and viewing-distance guidance (300 hand-held, 200-250 at 1-2 ft, 150 at 2-4 ft, 100 at 4 ft or more)retrieved 2026-10-13
- Visual acuity (Wikipedia): 20/20 vision resolves a visual angle of one minute of arc, about 1.75 mm at 6 mretrieved 2026-10-13
Last updated:
Method in depth: Pixels per inch, viewing distance and print size
Cite this page: Frame Kit, “Photo print size from pixels”, https://frame-kit.pages.dev/photo-print/photo-print-size-from-pixels/ (updated 13 October 2026).
Found a mistake? Email handycalc.sites+framekit@gmail.com.