Web and Digital
PPI Calculator
PPI Calculator calculate screen pixel density, pixel pitch, total megapixels, and physical width and height from resolution and diagonal size.
Web and Digital
PPI Calculator
Calculate screen pixel density, pixel pitch, total megapixels, and physical width and height from resolution and diagonal size.
Formula
PPI = sqrt(horizontal pixels^2 + vertical pixels^2) / diagonal inches.
About the PPI Calculator
Calculate screen pixel density, pixel pitch, total megapixels, and physical width and height from resolution and diagonal size.
How the PPI Calculator Works
Pixel diagonal is divided by physical diagonal, then the aspect ratio resolves physical width and height and the reciprocal density gives pixel pitch.
Formula
PPI = sqrt(horizontal pixels^2 + vertical pixels^2) / diagonal inches.
The calculation runs in your browser. Values are validated for required ranges, compatible units, and method-specific restrictions before results are displayed.
Required Inputs
- Horizontal resolution (required) - enter in px.
- Vertical resolution (required) - enter in px.
- Display diagonal (required) - enter in in.
Results Reported
The result panel reports the final answer and the intermediate quantities needed to check the calculation:
- Pixel density (PPI)
- Pixel pitch (mm)
- Total resolution (MP)
- Active width (in)
- Active height (in)
PPI Calculator Example
Select Example Data in the calculator to load this reproducible input set:
| Input | Example value |
|---|---|
| Horizontal resolution | 2560 px |
| Vertical resolution | 1440 px |
| Display diagonal | 27 in |
How to Use the Calculator
- Confirm that the calculator title and formula match the quantity you need.
- Enter every required value using the unit shown with its field.
- Select Example Data to inspect a valid input set, or enter your own values and select Calculate.
- Review all reported values and the displayed formula before using the answer.
- Use Copy Result or Download CSV when you need a reusable record.
Accuracy and Limitations
Use the active display diagonal and native pixel resolution. Marketing screen size, rounded dimensions, non-square pixels, scaling, and subpixel structure can differ.
Keep units consistent, use measurements that represent the actual situation, retain full precision during the calculation, and round only the final answer. Professional decisions may require current official rules, field measurements, laboratory methods, or specialist review.
Frequently Asked Questions
What does the PPI Calculator calculate?
Calculate screen pixel density, pixel pitch, total megapixels, and physical width and height from resolution and diagonal size.
Which formula does the PPI Calculator use?
PPI = sqrt(horizontal pixels^2 + vertical pixels^2) / diagonal inches. Pixel diagonal is divided by physical diagonal, then the aspect ratio resolves physical width and height and the reciprocal density gives pixel pitch.
What should I check before using the PPI Calculator result?
Use the active display diagonal and native pixel resolution. Marketing screen size, rounded dimensions, non-square pixels, scaling, and subpixel structure can differ.