As indicated in an earlier posting I had been unable to get the "Spotlight calculator" to work either. In looking in Spotlight Preferences I noticed that Applications need to be checked for Spotlight to search there, and made an assumption that maybe Spotlight calculator was using the "Calculator" program found in applications. Since I had moved my "Calculator" program onto the Desktop Dock it wasn't appearing in any of the items in Preferences that could be checked. Once I moved "Calculator" off Desktop Dock and back into the "Applications" folder, my Spotlight Calculator appeared as advertised! I think everyone needs to be sure the Calculator program is in a folder being checked by Spotlight, in order for this function to work.