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diff --git a/.config/emacs/modules/mm-calc.el b/.config/emacs/modules/mm-calc.el
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+;;; mm-calc.el --- Emacs configurations for ‘calc-mode’  -*- lexical-binding: t; -*-
+
+;; TODO: Swap more than 2 elements?
+(defun mm-calc-swap ()
+  "Swap the top two elements on the stack."
+  (declare (modes calc-mode))
+  (interactive)
+  (calc-over 2)
+  (calc-truncate-up 2)
+  (calc-pop 1)
+  (calc-truncate-down 2))
+
+(use-package calc
+  :bind (:map calc-mode-map
+         ("C-c x" . #'mm-calc-swap))
+  ;; TODO: Can this be done in :custom?
+  :init
+  (setopt
+   calc-display-trail nil
+   calc-group-digits t
+   ;; Optimize for Europeans
+   calc-point-char ","
+   calc-group-char "."))
+
+(provide 'mm-calc)