Unlike the calculator app on the Apple Watch, the iPhone version doesn't have an obvious back button. But that's because it's hidden in plain sight.

2 This image shows a new backspace button on the iPhone Calculator app in iOS 18 Credit: Apple Soon, Apple will release the iOS 18 update – likely in September.

In iOS 26, the Calculator now has both a backspace key and a C/AC key. Here’s a reminder of what these buttons do: The backspace key is persistent and sits in the top-left of the number keypad.