"QUICKCALC is not available in AutoCAD for Mac.

Inside AutoCAD for Mac you can use only command line version calculator - CAL:
https://help.autodesk.com/view/ACDMAC/2020/ENU/index.html?guid=GUID-335A5FC6-7D8F-47CA-B479-26655CDE...

You can use this command transparently inside another command for calculations by adding ' before the command name:
'CAL

If you have full AutoCAD, you can also use AutoLISP expressions for calculations."