Several additional variables control how Fortran indentation works:

fortran-do-indent

Extra indentation within each level of do statement (default 3).

fortran-if-indent

Extra indentation within each level of if, select case, or where statements (default 3).

fortran-structure-indent

Extra indentation within each level of structure, union, map, or interface statements (default 3).

fortran-continuation-indent

Extra indentation for bodies of continuation lines (default 5).

fortran-check-all-num-for-matching-do

In Fortran 77, a numbered do statement is terminated by any statement with a matching line number. It is common (but not compulsory) to use a continue statement for this purpose. If this variable has a non-nil value, indenting any numbered statement must check for a do that ends there. If you always end do statements with a continue line (or if you use the more modern enddo), then you can speed up indentation by setting this variable to nil (the default).

fortran-blink-matching-if

If this is t, indenting an endif (or enddo) statement moves the cursor momentarily to the matching if (or do) statement to show where it is. The default is nil.

fortran-minimum-statement-indent-fixed

Minimum indentation for Fortran statements when using fixed form continuation line style. Statement bodies are never indented by less than this. The default is 6.

fortran-minimum-statement-indent-tab

Minimum indentation for Fortran statements for tab format continuation line style. Statement bodies are never indented by less than this. The default is 8.

The following section describes the variables controlling the indentation of comments.