Tech calculator
Screen PPI Calculator
Measure screen pixel density from its native resolution and diagonal.
Pixel density
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How it works
Use the physical diagonal of the visible display and its native pixel resolution.
PPI = √(width² + height²) ÷ diagonal inches
Worked example
A 1920×1080 display at 24 inches is about 91.79 PPI.
How to use this tool
- Enter the known values and choose units where available.
- Check the primary result and supporting details.
- Clear or replace an input to calculate another case.
Frequently asked questions
What happens with invalid or incomplete inputs?
The result remains blank until the required inputs form a finite, meaningful calculation. Zero denominators and physically impossible negative quantities are not calculated.
Can I use decimal values?
Yes. The tool accepts decimals and keeps full precision for the calculation while rounding the displayed result for readability.