(iOS 14 and later only - see Tip 16 below.)

Double- or triple-tap the back of your iPhone.

Say or type 'Calculator' to Siri or Hey Siri.

Here are just some of the ways you could do it: OK, so this is pretty obvious.or is it? Yes, you can tap the Calculator app icon on the home screen, but there are other ways to open Calculator. For the most part, I've sorted it by the easiest, most intuitive actions to the more advanced ones, so skip ahead if you need to. This roundup is meant for everyone, from a total smartphone newbie to somebody who's owned iPhones since iPhones were a thing, and even professional mathematicians. What a 'hidden trick' is to some people might be obvious to others, so feel free to skip right by the ones you already know in the below list. You may know most of them, but there's a chance you don't know every single one or simply forgot about them. The Calculator app is probably one of Apple's most-used apps on the iPhone, yet I meet people all of the time that don't know all of the little tricks there are to using it more efficiently.

How to open calculator plus app