Screen PPI Calculator
Calculate pixel density and screen size from resolution and diagonal, and compare two screens.
Common screens
Compare with a second screen
Your result
Enter the resolution and the diagonal, or pick a common screen.
How to use it
- Enter the width, the height, and the diagonal.
- Add a second screen if you want one.
- Read the density and the sizes.
Examples
- 1920 by 1080 at 24 inches1920, 1080, and 24. The density is 91.79, the width is 20.92, and the height is 11.77.
- No second screenThe second fields are blank. The second row stays blank.
- A diagonal of zeroDiagonal 0. A message asks for a diagonal above zero.
Tool details and privacy
The density is rounded half up to two decimals. The inch sizes use that same density.
Leave the second screen empty to hide its row. If you start it, complete all three fields.
Options
- Pixels are whole numbers up to 20000. The diagonal is in inches and uses two decimals.
Limits
- Amounts use two decimal places and up to 12 digits before the decimal point. Rounding is half up.
- 1,250 is rejected. Write 1250 or 1250.50.
- A second screen, once started, needs all three fields.
Privacy
The numbers are calculated in your browser and are not sent to any server.
Questions
What is the density of 1920×1080 at 24 inches?
91.79 pixels per inch, with a width of 20.92 inches and a height of 11.77.
Does it read my device?
No. You type the numbers.
What if the second screen is blank?
It is ignored and its row stays blank.
Is the diagonal in centimetres?
No. The diagonal is in inches.