Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Assumes square pixels and a rectangular active display area. Diagonal excludes the bezel; PPI is not printer DPI.
Example Calculation
- Horizontal pixels: 1920
- Vertical pixels: 1080
- Diagonal size: 24 in
A 1920×1080 display at 24 inches has about 91.79 pixels per inch.
Frequently asked questions
How do I use this calculator?
Enter horizontal pixels, vertical pixels, diagonal size. The result updates automatically. Use Reset to restore the example values.
What method does it use?
PPI=√(horizontal pixels²+vertical pixels²)/diagonal inches; pitch=25.4/PPI mm.. Assumes square pixels and a rectangular active display area. Diagonal excludes the bezel; PPI is not printer DPI.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.