[Q] Native Pixel Density

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So, I've messed around with pixel density on my HD2 and now my SGS2 as well. One thing has always intrigued me; what is the native pixel density of these screens (given that the HD2 and the SGS2 share size/res).

So I worked it out thus (robbed straight from wikipedia):

1. Calculate diagonal resolution in pixels using the Pythagorean theorem:



2. Calculate PPI:



where

dp is diagonal resolution in pixels,
wp is width resolution in pixels,
hp is height resolution in pixels and
di is diagonal size in inches

So, the diagonal resolution is: 933 = square root of ((480x480)+(800x800))
The native pixel density should be 218.5 = (933 / 4.27)

Does that make sense to anyone or am I barking completely up the wrong tree? Maths never was my strong point

The above also assumes that the screen is exactly 4.3 inches diagonally.

Edit: This page shows the screen to be 4.27". Info amended above. Calculations checked and wiki info confirmed. Might change my pixel density to 218/219

You are right, that is the native screen dpi.
But, I think, that applications that are running in 800x480 are designed with 240 dpi as standard. Dpi is nothing more that a constant of the device provided to applications for calculations of text font size and layout of controls . That is my guess and I find comfortable a dpi of 200 for this device.
See what happens in windows when you change system font size (dpi)!

http://en.wikipedia.org/wiki/List_of..._pixel_density

Pixel density of ~2.18 as the screen is really 4.27

Yes, thank you. That was the info I was missing: the exact size of the screen. I will edit my original post.