grade curve calculator Grade Curve Calculator Points Earned Total Points Curve Method Add Points (e.g., +5 points) Add Percent (e.g., +10%) Set Class Average (scale to target) Set Highest Score to 100% (scale) Curved Grade: — Letter grading uses a common scale (A ≥ 90, B ≥ 80, C ≥ 70, D ≥ 60).