Screen Pixel Density Calculation Formula

How do you calculate the pixel density of a cell phone screen?

Pixel density (ppi)=√(X²+Y²)/


(X:number of length pixels;Y:number of width pixels;Z:screen size)

For example, for an iPhone


Resolution: 1334*750,

Screen size: 4.7 inches, its pixel Density (ppi):



Does anyone know how the density of LED display is calculated?

Pixel density = (1000mm/pixel pitch mm)*(1000mm/pixel pitch mm) points/m2

Resolution = (length of the display area mm/pixel pitch mm)*(width of the display area mm/pixel pitch mm)

Example: the density of the P6 is 27777 dots

Pixel density is in units of points/m2 and 1m=1000mm. The unit is dot/m2, and 1m=1000mm, the dot pitch P6 is 6mm dot pitch

So, (1000mm/6mm)*(1000mm/6mm)=27777 dot/m2

Vision Dazzle Optical Asahi

[Extension of Knowledge]

Dot Pitch (dotpitch), Pitch (pitch), pixel pitch (pixelpitch), these three terms are the same meaning, refers to the LED display, the center of a lamp bead to the center of the adjacent lamp bead distance in millimeters.

In the industry, also commonly used “pixelpitch” word in the letter “P” to abbreviate the point pitch, for example, 1.5mm point pitch screen known as P1.5, 2mm point pitch screen known as P2. other point pitches, and so on. And so on. In addition, the point pitch is also often combined with the product series name, for example, Vantage Lighting’s “WL2.5” indicates the 2.5mm point pitch display under the WL series, and “WL2.8″ indicates the 2.8mm point pitch display under the WL series. WL2.8” means 2.8mm dot pitch display under WL series.

How to find the pixel density of a camera

Camera pixel density calculation: pixel density = √{(number of pixels of length^2 + number of pixels of width^2)}/screen size.

A pixel is the basic encoding of the fundamental primary color pigment and its gray scale. Pixels are the basic units that make up a digital image, and the size of the image resolution is usually expressed in pixels per inch (PPI). More pixels means an increase in density per pixel, a decrease in the signal-to-noise ratio of individual pixels, a decrease in signal tolerance, and a signal that is easily saturated and susceptible to interference. In practice, it is the noise that is severe at high iso. (Note that here is the pixel density per unit area, one of the key is the size of the camera ccd, a 14.7 megapixel 1/1.8-inch than a 10 megapixel 1/2.5-inch digital camera pixel density is low) must pay attention to here is the pixel density. And again on a ccd of the same size the pixel density goes down, while it improves the signal to noise ratio and also improves the amount of high iso noise, it’s blatantly obvious that with fewer pixels the resolution goes down. There’s more to gain than to lose.

Calculation formula for cell phone pixel density?

Pixel density calculation formula for cell phone/computer screen

How many inches of the screen refers to the length of the diagonal. Pixel density refers to (to 1920 x 1080, 5 inches, for example), 1920 and 1080 of the square and open the root (is the algorithm of the length of the hypotenuse of a right triangle), open out equal to 2202.9, divided by 5 inches to get ppi441 or so

Example: “HTCOne (32GB/single card/international version)

4.7 inches of screen, the Resolution 1920×1080 Solve for pixel density?

Solution: √(1920^2+1080^2)=2202.9071

2202.9/5=468.7021 (ppi)≈469ppi

Answer: The pixel density of this screen is about 469ppi.

Zhang Yang

Made 18/03/2014

What is the density of px

“px” is a unit used to measure the size of an image on a screen or monitor, and it stands for pixel. A pixel is the smallest visible point on a display device and consists of the primary colors red, green, and blue. Pixel density refers to the number of pixels per inch (or centimeter) and is expressed in “ppi” (pixels per inch) or “dpi” (dots per inch).

The formula for calculating pixel density is as follows:

Pixel Density=Resolution/Screen Size

Where resolution is the product of the number of horizontal pixels and the number of vertical pixels on the screen. Screen size is the diagonal length of the screen.

For example, if a display device has a resolution of 1920×1080 and a screen size of 15.6 inches, the following formula can be used to calculate the pixel density:

Pixel Density = (1920^2+1080^2)^0.5/15.6

The resulting result is usually given in ppi, which represents the number of pixels per inch .

It’s important to note that pixel density is not directly proportional to display quality or image sharpness. While a higher pixel density may provide a more detailed image in some cases, other factors such as display technology, screen size, and resolution can also have an impact on the display.

It’s worth noting that pixel density may vary across devices and display technologies. For example, devices such as cell phones, tablets, and TVs typically have high pixel densities, while computer monitors have lower pixel densities because they are typically viewed from a greater distance.