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I am making a calculator app for the iPad. I would like to know if it would be acceptable to most users (the golden 80% rule) for the calculator to be locked in portrait.

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up vote 4 down vote accepted

I would suggest not - many cases for the iPad hold it elevated in landscape, so a user with the screen raised would not be able to use your calculator. I can't provide figures, but would suggest that looking at the most popular calculator apps should give you some indication about which designs are succeeding and failing on the app store.

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Thanks! Now I get to completely rejigger my entire app and learn auto layout! (Good thing) – Undo Jan 8 '13 at 21:22
:D My work here is done ;) – Peter Jan 8 '13 at 21:26

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