The counting rule
For the public-school calendar covered here, the calculator counts Sunday through Thursday, removes Friday and Saturday, then removes fixed academic breaks recorded in the tool.
School days = Sunday–Thursday dates in the range − recorded school-break dates
Choose whether the start date counts
If today is a school day and you want to include today, leave “Count the start date” selected. If you are planning from tomorrow onward, switch it off.
Why the grade selector matters
The final-exam end date differs by grade group. Grades 1–9, Grades 10–11 and Grade 12 therefore have separate targets for the end of final exams.
Why long-range numbers can change
Movable religious/public holidays can be confirmed later. The tool flags longer-range results rather than pretending a provisional date is certain.