How it works
Estimate screen pixel density assuming square pixels and the stated active-display diagonal in inches.
PPI = √(width²+height²)/diagonal
Worked example
Show example inputs and result
Horizontal pixels: 1,920 · Vertical pixels: 1,080 · Diagonal size: 24.
- Pixel density
- 91.78779875 ppi
Questions and answers
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.
Method reviewed: October 8, 2026 · Methods & accuracy