Formula
PPI = √(horizontal pixels² + vertical pixels²) ÷ diagonal inches.
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Screen pixel density
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Reproducible, not guessed
PPI = √(horizontal pixels² + vertical pixels²) ÷ diagonal inches.
Perceived sharpness also depends on scaling, viewing distance, font rendering and panel structure.
Results are for first-pass estimates and scenario comparison. Important tax, employment, health and investment decisions should be verified against local official guidance or a qualified professional.