When to use this calculator
Calculate pixels per inch from resolution and physical screen diagonal. Uses diagonal measurement of the active display area.
Explore the everyday digital measurements calculators for other questions in this topic. For a related calculation, use the Screen Diagonal Calculator: Find a screen’s diagonal from its width and height.
PUTTING IT INTO PRACTICE
Pixel Density: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Horizontal pixels (integer) | 1,920 |
| Vertical pixels (integer) | 1,080 |
| Diagonal (inches) | 24 |
| Result | 91.787799 PPI |
- Check the input labels and enter the example values above.
- Apply the relationship: PPI = √(horizontal² + vertical²) ÷ diagonal inches.
- The result is 91.787799 PPI, rounded for display.
How to interpret your result
Uses diagonal measurement of the active display area.
Bits and bytes differ by a factor of eight. Decimal MB and GB are different from binary MiB and GiB. A file-capacity estimate should use usable storage rather than a device’s advertised total where possible.
Frequently asked questions
Are MB and MiB the same amount of data?
No. MB is one million bytes; MiB is 1,048,576 bytes. These tools state decimal units where relevant.
How do I use the pixel density calculator?
Enter horizontal pixels (integer), vertical pixels (integer), diagonal (inches). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
PPI = √(horizontal² + vertical²) ÷ diagonal inches.
What should I check before using the result?
Uses diagonal measurement of the active display area.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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