Screen PPI Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the width and height in pixels and the diagonal in inches.
- Read the PPI and dot pitch.
How it works
PPI = √(width² + height²) ÷ diagonal — the diagonal pixel count divided by the diagonal in inches.
Worked example
1920×1080 on 15.6". ≈ 141 PPI.
Common mistakes
- Using the visible area diagonal vs the advertised size — they can differ slightly.
- Entering centimetres for the diagonal instead of inches.
Frequently asked questions
What's a good PPI?
Phones are often 400+ PPI; laptops around 130–220; desktop monitors 90–160. Higher PPI looks sharper.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.