Image Pixel Density Calculator
Estimate image pixel density from pixel width, pixel height and a specified physical diagonal.
How to use this calculator
- Enter integer pixel dimensions and the actual physical diagonal in inches.
- Check the labels and units before using a result outside this page.
- Change one input at a time if you want to compare scenarios.
Formula and method
PPI = √(width² + height²) ÷ diagonal inches
- PPI = √(width² + height²) ÷ diagonal inches
- The result depends on the physical diagonal and does not account for display scaling, subpixels or perceived sharpness.
Worked examples
Worked example
A 1920 × 1080 display with a 24-inch diagonal.
Pixel diagonal is about 2202.9, so PPI is about 91.8.
Pixel diagonal is about 2202.9, so PPI is about 91.8.
Understanding the result
Estimate image pixel density from pixel width, pixel height and a specified physical diagonal.
The result depends on the physical diagonal and does not account for display scaling, subpixels or perceived sharpness.
Important notes
The result depends on the physical diagonal and does not account for display scaling, subpixels or perceived sharpness.
Displayed outputs are rounded for readability; preserve full precision when continuing a calculation.
Frequently asked questions
What does this image pixel density calculator show?
Estimate image pixel density from pixel width, pixel height and a specified physical diagonal.
Which inputs should I check first?
Enter integer pixel dimensions and the actual physical diagonal in inches.
Can the result be used as a final professional specification?
The result depends on the physical diagonal and does not account for display scaling, subpixels or perceived sharpness.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.