For each iPhone 8 Plus and XR pixel, there are three subpixels. Each has red, green, and blue.

For each iPhone XS Max pixel, there are two subpixels. Each has green, but they alternate between red and blue.

For the iPhone 8 Plus, the 1920x1080 screen size is 5.5", or 4.79 x 2.70 inches = 12.933 inches squared.

For the iPhone XS Max, the 2688x1242 screen size is 6.5", or 5.90 x 2.72 inches = 16.048 inches squared.

For the iPhone XR, the 1792x828 screen is 6.1", or 5.54 x 2.56 inches = 14.18 inches squared.

For the iPhone 8 Plus, there are 3x1920x1080 = 6220800 subpixels, or 481002 subpixels per square inch.

For the iPhone XS Max, there are 2x2688x1242 = 6676992 subpixels, or 416064 subpixels per square inch.

For the iPhone XR, there are 3x1792x828 = 4451328 subpixels, or 313916 subpixels per square inch.

If we are to set a standard for pixel density with the iPhone 8 Plus as equal too 100%, it would be as follows:

100% - iPhone 8 Plus

86% - iPhone XS Max

65% - iPhone XR

Now, these are on the basis of two-dimensional measurements. If we were to calculate based on one-dimensional measurements, you have to take the square root of the difference in area pixel density. Once we do this, we get:

401 ppi: iPhone 8 Plus (and also all other Plus iPhones)

373 ppi: iPhone XS Max (and also XS and X)

326 ppi: iPhone XR (and also 4, 4S, 5, 5C, 5S, SE, 6, 6s, 7, 8)

For each iPhone XS Max pixel, there are two subpixels. Each has green, but they alternate between red and blue.

For the iPhone 8 Plus, the 1920x1080 screen size is 5.5", or 4.79 x 2.70 inches = 12.933 inches squared.

For the iPhone XS Max, the 2688x1242 screen size is 6.5", or 5.90 x 2.72 inches = 16.048 inches squared.

For the iPhone XR, the 1792x828 screen is 6.1", or 5.54 x 2.56 inches = 14.18 inches squared.

For the iPhone 8 Plus, there are 3x1920x1080 = 6220800 subpixels, or 481002 subpixels per square inch.

For the iPhone XS Max, there are 2x2688x1242 = 6676992 subpixels, or 416064 subpixels per square inch.

For the iPhone XR, there are 3x1792x828 = 4451328 subpixels, or 313916 subpixels per square inch.

If we are to set a standard for pixel density with the iPhone 8 Plus as equal too 100%, it would be as follows:

100% - iPhone 8 Plus

86% - iPhone XS Max

65% - iPhone XR

Now, these are on the basis of two-dimensional measurements. If we were to calculate based on one-dimensional measurements, you have to take the square root of the difference in area pixel density. Once we do this, we get:

401 ppi: iPhone 8 Plus (and also all other Plus iPhones)

373 ppi: iPhone XS Max (and also XS and X)

326 ppi: iPhone XR (and also 4, 4S, 5, 5C, 5S, SE, 6, 6s, 7, 8)

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