Does anyone know a way of finding all calculations which contain fieldname '$x'?
You can use Developer Assistant by Dracoventions. http://www.2empowerFM.com
It can search field, table names, scripts etc. I believe that there is a free trial. It is well worth the cost.
Many thanks Bruce
Quick and dirty way:
Print your calculation fields from the Define Database dialogue window, print it to a pdf print driver (or save as pdf on mac), then search the pdf file!
Retrieving data ...