Grade Average Calculator — Average Your Test Scores
Enter each test score as earned / possible points. GradeLab averages the percentages instantly — and, if your syllabus allows it, drops your lowest score first. Everything runs in your browser; nothing is uploaded or tracked.
How it works: each score becomes a percentage (earned ÷ possible × 100), then the percentages are averaged, so every test counts equally regardless of how many points it was worth. Worked example: 90/100, 80/100, 70/100 → 80.00% (B−); dropping the lowest → 85.00% (B).
Frequently asked questions
How is a grade average calculated?
Each score is converted to a percentage (earned ÷ possible × 100), then the percentages are averaged. Example: 90/100, 80/100 and 70/100 average to 80.00%, a B− on the standard plus/minus scale.
Is averaging percentages the same as total points ÷ total possible?
Not when tests are worth different points. Averaging percentages weights every test equally; total points weights bigger tests more. Example: 100/100 and 0/20 average to 50% by percentages, but 100/120 = 83.3% by points. This calculator averages percentages — the usual meaning of "grade average" — and shows the kept points total separately so you can see both.
How does dropping the lowest score work?
Turn on "Drop my lowest score" and the single lowest percentage is excluded before averaging. Example: 90, 80 and 70 average to 80.00%; dropping the 70 gives (90 + 80) ÷ 2 = 85.00%, a B. Only use it if your syllabus actually allows a dropped score.
What letter grade scale is used?
The common US plus/minus scale: A+ ≥ 97%, A ≥ 93%, A− ≥ 90%, B+ ≥ 87%, B ≥ 83%, B− ≥ 80%, C+ ≥ 77%, C ≥ 73%, C− ≥ 70%, D+ ≥ 67%, D ≥ 63%, D− ≥ 60%, F below 60%. Scales vary by school and instructor — confirm your syllabus.
Can I enter extra credit?
Yes. A score above 100% counts as entered, so an average can exceed 100% with enough extra credit — the calculator reports it honestly rather than capping it at 100.