What is Pixel Per Inch (PPI)?
Pixel Per Inch (PPI) is the measurement of Pixel Density of digital image and display. The full name of PPI is Pixel per inch, it tells about any pixel density or resolution of an electronic device like smartphone, monitor, TV etc. You can tell the screen sharpness of that device by looking at the PPI of any phone. The more the PPI the phone is, the more clearly the screen is.
Whenever you buy phones, you must also check the phone’s screen size and screen resolution along with its PPI, as the higher the PPI in the phone, the better the picture quality will be. There are pixels in every inch of smartphones. Picture zooming will be visible even if you zoom in as much as possible.
Let’s say if you buy 2 smartphones with 5.5-inch screen size and full HD resolution, then you will think their picture quality will be the same. But if one of the smartphones has PPI 423 and the other is 441, then obviously the smartphone whose PPI will be more, the picture quality will be good for the same smartphone.
How to Calculate PPI of Smartphone
You can calculate Pixel Per Inch (PPI) in multiple ways. The most common one is to calculate it from the diagonal screen size in inches or cm and the number of pixels alongside the
vertical and horizontal edge of the display.
1st, you need to calculate the number of pixels that match at the diagonal
dₒ = √(w² + h²)
Dp = diagonal resolution in pixels
Wp = width resolution in pixels
Hp = height resolution In pixels
Di = diagonal size in inches (it is the number advertised as the size of the display) L
Calculate Diagonal Resolution (Pixels)