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Pixel Count and Physical Print Dimensions

Pixel count is physical print size in inches times pixels per inch. Width and height use independent physical units; one international inch is exactly 25.4 mm.

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

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Formula and method

Pixel count is physical print size in inches times pixels per inch. Width and height use independent physical units; one international inch is exactly 25.4 mm.

printHeight = imageHeight / PPI; printWidth = imageWidth / PPI

Worked example

Enter these known values and leave the other values blank.

Viewing distance
Enter a custom pixel density
Pixel density
300 pixels/ in
Print size
Allow custom print and image file dimensions
Print width
254 mm
Print height
127 mm
Image width in pixels
3000 pixels
Image height in pixels
1500 pixels

Assumptions and limitations

  • Pixel count is physical print size in inches times pixels per inch. Width and height use independent physical units; one international inch is exactly 25.4 mm.
  • Viewing-distance presets are captured resolution heuristics, not guarantees of perceived sharpness. Standard paper and photo dimensions remain selectable; custom modes permit independent density and dimensions.

Common questions

What does this model assume?

Pixel count is physical print size in inches times pixels per inch. Width and height use independent physical units; one international inch is exactly 25.4 mm.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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