Currently calculated fields allow basic math, and some date functions such as diffindays, however there are missing math functions which would be useful such as:
max(a,b,...) - return the maximum value from the list provided
min(a,b,...) - return the minimum value from the list provided
abs(a) - return the abs value from the list provided

in fact all the functions available here:
https://docs.microsoft.com/en-us/sql/t-sql/functions/mathematical-functions-transact-sql?view=sql-server-ver15