Believe it or not, Apple still does not support the iPad with its basic Calculator app. And as much as nerds love their calculator watches, there’s no support for Apple Watch, either. If you ...

The simple calculator uses 7% as the average annual price increase, but users can tweak that number if they want.

Your Apple iPhone's calculator can do more than add and subtract numbers and percentages so you can tip your waiter or waitress. It is a multifaceted tool.