What is the PPI Calculator?
The ppi calculator is a free online tool that helps you work out ppi quickly and accurately. It uses the standard formula PPI = sqrt(width^2 + height^2) / diagonal and shows the result instantly as you type, along with a full breakdown so you can see exactly how the answer was reached.
How to use this calculator
- Enter the screen width and height in pixels.
- Enter the diagonal in inches.
- See the PPI.
Formula used
PPI = sqrt(width^2 + height^2) / diagonalExplanation of each input
- Width (px) โ the width used in the calculation.
- Height (px) โ the height used in the calculation.
- Diagonal (inches) โ the diagonal used in the calculation.
Understanding your result
- Pixels per inch โ the calculated pixels per inch.
Step-by-step calculation
For the example values 1920x1080, 15.6 in:
- Apply the formula:
PPI = sqrt(width^2 + height^2) / diagonal - Substitute the values: sqrt(1920^2+1080^2)/15.6
- Result: about 141 PPI
Worked example
| Inputs | 1920x1080, 15.6 in |
|---|---|
| Working | sqrt(1920^2+1080^2)/15.6 |
| Result | about 141 PPI |
Benefits and practical uses
This calculator saves you time and reduces errors when you need ppi. It is useful for students, professionals and anyone who wants a fast, reliable answer without manual calculation. Results update instantly, work in your browser and can be copied or shared in one click.
Assumptions and limitations
- Square pixels.
Frequently asked questions
What is PPI?
Pixels per inch - a measure of screen sharpness.
Disclaimer: Results are provided for general information. Please verify important figures independently.