About the grade calculator
List your graded work with the score you earned, the points possible and, if your teacher weights categories, the weight in percent. The calculator returns your current percentage and letter grade. Without weights, it simply divides total points earned by total points possible.
To plan for the final exam, enter your desired overall grade and the weight of the final. The calculator solves for the score you need. A needed score above 100% means the target may be out of reach unless extra credit is offered. Rows with 0 points possible are ignored.
Formula
- Current grade = Σ(earned ÷ possible × weight) ÷ Σ weight
- Needed on final = (desired − current × (1 − final weight)) ÷ final weight
Example
Homework 88/100 (20%), quiz 42/50 (20%) and midterm 78/100 (30%) give a current grade of 82.57%. With a final worth 30% and a goal of 90%, you need (90 − 82.57 × 0.7) ÷ 0.3 = 107.3%, which is out of reach, while a goal of 85% would need about 90.7%.