Pixel Density Calculator
Calculate display pixels per inch from resolution and diagonal size.
How to use
- Enter horizontal and vertical pixel counts.
- Enter diagonal screen size in inches and calculate.
Capabilities and scope
Pixel diagonal √(w²+h²) is divided by physical diagonal inches.
How it works
PPI=√(width²+height²)/diagonalInches.
Example
1920×1080 at 24 inches is about 91.79 PPI.
Useful for
- Compare monitor or phone pixel density
- Relate resolution to physical display size
Before you use it
- Nominal diagonal, active-area differences, and subpixel layout are not modeled.
Frequently asked questions
Is PPI the same as printer DPI?
No. PPI describes display pixels; DPI is commonly used for printed dots.