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Body
 Answering the question as asked about the size of pixels: Pixel size on an iPhone and iPod Touch <ol> <li>The earlier iPhones (pre-iPhone 4) Apple iPhone Technical Specifications said : 480-by-320-pixel resolution at 163 pixels per inch(ppi). About 0.006135 inches per pixel or 0.1558282 mm per pixel. </li> <li>The first three iPod touch generations stated the same 163 ppi.</li> <li>The iPhone 4 specs said 960-by-640-pixel resolution at 326 ppi . So pixel width is 1 inch / 326 pixels per inch or about 0.003067 inches per pixel or 0.0779 mm per pixel. You use points, not pixels. Edit: As noted in Olaf's comment, below, pixels are actually addressable, using half-points.</li> <li>The fourth generation iPod touch (Sept 2010) has <a href="http://www.apple.com/ipodtouch/specs.html" rel="nofollow noreferrer" title="Apple - iPod Touch - Technical Specifications"> specs </a> the same as the iPhone 4, 960-by-640-pixel resolution at 326 ppi </li> <li>The iPhone 4S (Oct 2011) is unchanged from the iPhone 4 in terms of resolution.</li> <li>The iPhone 5 (Sept 2012) specs said 1136-by-640 pixel resolution at 326 ppi. Pixel size is unchanged. Screen diagonal is 4 inches.</li> <li>The iPhone 5C and iPhone 5S (Sept 2013) have the same resolution, pixel size, and diagonal as the iPhone 5.</li> <li>The iPhone 6, 4.7 inch, (Sept 2014) <a href="http://www.apple.com/iphone-6/specs/" rel="nofollow noreferrer" title="Apple - iPhone - Technical Specifications">specs</a> are 1334-by-750-pixel resolution, at 326 pixels per inch (ppi). pixel size is unchanged from 4, 4S, 5 5s. </li> <li>The iPhone 6 Plus, 5.5 inch, (Sept 2014) <a href="http://www.apple.com/iphone-6/specs/" rel="nofollow noreferrer" title="Apple - iPhone - Technical Specifications">specs</a> are 1920-by-1080-pixel resolution, at 401 pixels per inch (ppi). pixel size is about 20% smaller. The pixel width is 1 inch / 401 pixels per inch or about 0.002494 inches per pixel or 0.06334 mm per pixel. </li> </ol> Pixel size on an iPad <ol> <li>The iPad 1 and 2 are 9.7 inch (diagonal) display with 1024-by-768-pixel resolution at 132 ppi per the iPad specs. That is about .0075758 inches per pixel or 0.1924 mm per pixel. <li> The new iPad (March 2012) is a 9.7 inch (diagonal) display with 2048-by-1536-pixel resolution at 264 ppi per the current <a href="http://www.apple.com/ipad/specs/" rel="nofollow noreferrer" title="Apple - iPad specs">iPad specs</a>. That is about .0037879 inches per pixel or 0.09621 mm per pixel. </li> <li>The iPad Mini (1st generation - October 2012) is a 7.9 inch (diagonal) display with a 1024-by-768-pixel resolution at 163 ppi per the original iPad mini specs. That is about .006135 inches per pixel or 0.156 mm per pixel. </li> <li> The iPad Mini 2 (2nd generation - October 2013) is a 7.9 inch (diagonal) display with a 2048-by-1536-pixel resolution at 326 ppi per the current <a href="http://www.apple.com/ipad-mini/specs/" rel="nofollow noreferrer" title="Apple - iPad mini specs">iPad mini specs</a>. That is about .0030675 inches per pixel or 0.0779 mm per pixel. </li><li> The iPad Air 2 (October 2014) and the iPad Mini 3 (October 2014) have the same resolution, pixel size, and diagonal as the previous versions of those products. <a href="http://www.apple.com/ipad/compare/" rel="nofollow noreferrer" title="Apple Compare specs of new iPad with iPad 2"> Comparison of the iPad Air, and iPad Air 2, iPad Mini, iPad 2 and iPad3.</a> </ol> You don't need to have the iPhone SDK calculate the size of a single pixel. One option is to <a href="https://stackoverflow.com/questions/3028434/how-can-i-determine-programmatically-that-my-app-is-running-on-an-iphone-ipad-or">determine what you are running on</a> and then select the needed mm size. The iPhone (up to and including the 4S) / iPod Touch screen sizes, with a 3.5 inch (diagonal) display are NOT exactly 2" x 3". They are a tiny bit smaller than that. The iPhone 5 has a 4 inch (diagonal) display. What the questioner may actually need: points. See Removers comment to the previous answer. Coordinates are specified in points, not pixels. 
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