GNU Calc, for Emacs, has both RPN and infix modes, iirc. (I need to go actually try it.) https://www.gnu.org/software/emacs/manual/html_node/calc/Units.html ht

GNU Calc, for Emacs, has both RPN and infix modes, iirc. (I need to go actually try it.) https://www.gnu.org/software/emacs/manual/html_node/calc/Units.html https://www.gnu.org/software/emacs/manual/html_node/calc/Uni...