This example demonstrates how a user-specified distance in inches can be converted to meters with the cvunit function.
(defun C:I2M ( / eng_len metric_len eng metric) (princ "\nConverting inches to meters. ") (setq eng_len (getdist "\nEnter a distance in inches: ")) (setq metric_len (cvunit eng_len "inches" "meters")) (setq eng (rtos eng_len 2 4) metric (rtos metric_len 2 4)) (princ (strcat "\n\t" eng " inches = " metric " meters.")) (princ) )