Pixels per inch
Pixels per inch: use horizontal pixels, vertical pixels, screen diagonal. Review the formula, worked example and calculation steps.
Inputs
Use the units shown—
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Formula & explanation
PPI = √(horizontal pixels²+vertical pixels²)/diagonal inches
Variables & units
- Horizontal pixels
- Numeric value · minimum 1, maximum 100000
- Vertical pixels
- Numeric value · minimum 1, maximum 100000
- Screen diagonal
- in · minimum 0.000001, maximum 1000000000000
Worked example
1920×1080 on a24-inch display gives approximately91.79 PPI.
Assumptions
Assumes square pixels and a rectangular flat display.
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
Practice with an example
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