How to Fix Mac Calculator '=' Button Not Showing Up

In Mac calculators, sometimes you see a button that says "Enter" instead of the "=" button (see below). This can be frustrating, as pressing the Enter key will not result in a correct calculation.





The solution is to go to the Calculator menu -> View -> Turn off 'RPN mode'*.

* The Reverse Polish Notation (RPN) method was originally created to reduce computer memory access and evaluate expressions using a stack, and all Hewlett Packard desktop and portable calculators used RPN in the 1970s and 1980s, and continued to use it on some models into the 2020s. In computer science, RPN notation is used in stack-oriented programming languages such as Forth, STOIC, and PostScript. Forth, STOIC, PostScript, RPL, and Joy. (Source: https://en.wikipedia.org/wiki/Reverse_Polish_notation). 

For more information on how to use RPN mode, see: https://support.apple.com/lv-lv/guide/calculator/calc34870/mac

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