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Final Grade Override lets you enter a final course grade that differs from the grade Canvas automatically calculates in the Gradebook. Individual assignment scores stay exactly as they are.
You may enter either a letter grade or a percentage. For an exact numeric grade, enter a percentage; a letter grade uses the grading scheme’s lower bound.
View the how-to guide here: https://community.instructure.com/en/kb/articles/660860-how-do-i-override-a-students-final-grade-in-the-gradebook