Select the number of weighted categories in your grading scheme, then enter the points you have and points possible for each. Blanks are treated as 0's, and categories with 0 pts/0 max are treated as no credit. To automatically adjust the other categories to compensate, either leave the category out or enter 0 as the weight.
Enter details about the test/assignment to optimize on. Please make sure you select the correct category, and remember to round up the minimum score if it's not possible to score partial points. If there are grades that are not yet factored into your current grade, the number of points you will need to score may change.
Alternatively, you can generate a standard table: