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If you'd like rows added to this sheet for your own devices or viewing distances, sent a Twitter message to me, Richard Gaywood -- @penllawen.

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For an explanation of the methods and data used in this sheet, see:http://www.tuaw.com/2012/03/01/retina-display-macs-ipads-and-hidpi-doing-the-math/

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Max visual acuity (arc seconds):1"1" is represents 20/20 (i.e. average) vision

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Higher numbers represent worse vision, lower numbers are better vision

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Screen size (inches)Resolution (pixels)Aspect ratioScreen height (inches)PPIViewing distance (inches)PPI for "Retina"Closeness to "retina"Inter-pixel spacing (arc minutes)Size of five pixels on the eye (arc minutes)screen area (square inches)

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MacBook Air, 11.6"11.613687681.85.7135.222156.387%1.165.78

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MacBook Air, 13.3"13.314409001.67.0127.722156.382%1.226.12

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MacBook Pro, 15.4"15.414409001.68.2110.324143.277%1.306.50

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High-res MacBook Pro, 15.4"15.4168010501.68.2128.624143.290%1.115.57

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MacBook Pro, 17"17192012001.69.0133.226132.2101%0.994.96

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iMac, 24"24192010801.811.891.828122.875%1.346.69

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iMac, 27" / T.bolt Display27256014401.813.2108.828122.889%1.135.64

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iPhone 3G / 3GS3.54803201.51.9164.811312.553%1.909.48

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iPhone 4 / 4S3.59606401.51.9329.711312.5105%0.954.74

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Apple's tabletsiPad 1 / 29.710247681.35.8132.016214.961%1.638.1445.2

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Retina display iPad 39.7204815361.35.8263.916214.9123%0.814.0745.2

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iPad mini7.8510247681.34.7163.116214.976%1.326.5929.6

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iPad mini Retina display7.85204815361.34.7326.116214.9152%0.663.2929.6

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iPod nano (late 2012)2.54322401.81.2197.717.5196.4101%0.994.972.7

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Amazon's tabletsKindle710246001.73.5169.516214.979%1.276.3421.4

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Kindle Fire HD712808001.63.7215.616214.9100%1.004.9822.0

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Kindle Fire 8.9" HD8.9192012001.64.7254.416214.9118%0.844.2235.6

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50" Blu-Ray playback50192010801.824.544.17247.792%1.085.42

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50" widescreen DVD507204801.527.717.37247.736%2.7613.79

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40" 720p console game4012807201.819.636.77247.777%1.306.50

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32" 720p console game, 7.5 feet3212807201.815.745.97844.1104%0.964.80

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Closer distances27" iMac / TBolt Display, 16" distance27256014401.813.2108.816214.951%1.989.88

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17" MacBook Pro, 16"17192012001.69.0133.216214.962%1.618.07

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MacBookAir 13", 16"13.314409001.67.0127.716214.959%1.688.41

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iPad 1 / 2, 12"9.710247681.35.8132.012286.546%2.1710.85

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Retina display iPad 3, 12"9.7204815361.35.8263.912286.592%1.095.43

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Reader suggestionsAsus Transformer Prime10192012001.65.3226.416214.9105%0.954.74

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24" iMac (for @marcedwards)24192012001.612.794.316214.944%2.2811.39

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Samsung Galaxy Note (for @alexbrooks)5.312808001.62.8284.811312.591%1.105.49

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21.5" iMac (for @gizmosachin)21.5192010801.810.5102.518191.054%1.869.32

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13" MacBook Pro (for @ebbv)13.312808001.67.0113.516214.953%1.899.47

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iMac, 24" (for @ebbv)24192010801.811.891.824143.264%1.567.80

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Digital cinema30ft screen, mid-row, 2K360204810801.9167.96.45406.4101%0.994.95

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for @SayCinema50ft screen, mid-row, 2K600204810801.9279.93.99003.8101%0.994.95

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30 ft screen, mid-row, 4K360409621601.9167.912.95406.4202%0.492.47

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30 ft screen, front row (15'), 2K360204810801.9167.96.418019.134%2.9714.85

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30 ft screen, front row, 4K360409621601.9167.912.918019.167%1.487.42

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New MBPwRDMacBook with Retina display, Retina distance15.4288018001.68.2220.515.6220.4100%1.005.00

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MacBook with Retina display, typical distance15.4288018001.68.2220.516214.9103%0.974.87

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for @rawsoncjApple II w/ Apple Monitor II in Hi-Res mode, typical use distance122801921.37.326.216214.912%8.1940.94

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(thanks @randomoneh)As above, but Retina distance (!)122801921.37.326.213126.2100%1.005.00

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Nexus 7712808001.63.7215.616214.9100%1.004.9822.0

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Sony Bravia KD-84X9005 TV84409621601.939.255.19038.2144%0.693.462,911.3

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Galaxy S III4.812807201.82.4306.011.5298.9102%0.984.899.8

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HTC Desire C3.54803201.51.9164.811.5298.955%1.819.075.7

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30" 4K monitor30384021601.814.7146.922.5152.896%1.045.20384.6

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30" monitor ("normal" res)30256014401.814.797.922.5152.864%1.567.80384.6

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80" 4K TV80384021601.839.255.17247.7115%0.874.332,734.7

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27" 4K monitor27384021601.813.2163.220171.995%1.055.27311.5

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IBM T210 monitor20.8204815361.312.5123.118191.064%1.557.76207.7

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IBM T22022.2384024001.611.8204.017202.2101%0.994.96221.5

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85" 4K TV showing 1080p content85192010801.841.725.913226.0100%1.005.023,087.2

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110" 4K TV showing 1080p content26.0435363259517

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55" 4K TV55384021601.827.080.14379.9100%1.004.991,292.6

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55" 1080p TV55192010801.827.040.18640.0100%1.004.991,292.6