Manual entry or paste from your grade export. Grades calculate automatically.
Everything stays in this browser tab. Nothing is sent anywhere and nothing is saved. Close the tab and the grades are gone.
Paste rows directly from your grade system. Each row should have a student ID, name, section, grade level, and four quarter grades like C(73.28). The system average column at the end is ignored. Paste with tabs between columns so an empty quarter stays in its own column.