Enter expressions using Reverse Polish Notation (RPN) in Calculator on Mac

Go to the Calculator app on your Mac.

Do one of the following:

• Choose View > RPN Mode in the menu bar.

  If RPN is unavailable, choose Basic or Scientific, then choose RPN.

• Press Command-R.

The stack is shown in Calculator’s display, the Equal Sign key (=) becomes the Enter key, and four keys appear for manipulating numbers on the stack.

Do any of the following:

• Swap the bottom two numbers on the stack: Click .

• Rotate the contents of the stack up or down: Click the or .

• Remove the bottom number from the stack: Click the Drop key.