Tuesday, July 10, 2012

iPad Mini: Gruber Math Is Wrong

John Gruber wants to set the record straight regarding the iPad mini, it is an 8-inch tablet...not a 7-inch tablet. I agree with him that the 9.7-inch iPad is being called a 10-inch tablet...so the 7.85-inch tablet is really closer to 8-inches.


According to Gruber:

'One naturally thinks that a seven-inch screen would offer 70 percent of the benefits of a 10-inch screen. Unfortunately, this is far from the truth. The screen measurements are diagonal, so that a seven-inch screen is only 45 percent as large as iPad’s 10-inch screen. You heard me right: just 45 percent as large.... 7.85 inches is closer to 8 inches than 7, and that the exact size of the purported iPad Mini display offers 66 percent of the surface area of a 9.7-inch iPad, not 45 percent."

Gruber's math appears to be off here...here is my math.
  • 9.7-inch iPad has dimensions of 5.82-in by 7.76-in or 45.16 square inches
  • 7-inch iPad has dimensions of 4.2-in by 5.6-in or 23.52 square inches
  • 7.85-inch iPad has dimensions of 4.71-in by 6.28-in or 29.58 square inches
The 7-inch iPad would be 52.1% of the original iPad surface area

The 7.85-inch iPad would be 65.49% of the original iPad surface area

So the "45 percent as large" from Grubers post is incorrect.

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