How a semester grade is calculated
A semester grade is a weighted average. Each grading period and the semester exam gets a weight, which is its share of the semester grade, and the weights add up to 100%. Multiply each grade by its weight, add the results, and divide by 100.
Semester grade = (G1 × W1 + G2 × W2 + … + E × We) ÷ 100
G = grade for a grading period (%), W = that period’s weight (%), E = exam grade (%), We = exam weight (%). The weights must total 100%.
Two quarters at 40% each plus a 20% exam is a common split, and it is the calculator’s default. Schools differ, though, so enter the weights from your own syllabus or handbook.
Example: semester grade with 40/40/20 weights
Quarter 1 is 88%, Quarter 2 is 92% and the exam is 79%, weighted 40/40/20.
- Quarter 1: 88 × 40 ÷ 100 = 35.2 points
- Quarter 2: 92 × 40 ÷ 100 = 36.8 points
- Exam: 79 × 20 ÷ 100 = 15.8 points
- Semester grade: 35.2 + 36.8 + 15.8 = 87.8%, a B on the scale below.
Semester exam calculator: the score you need
To find the exam score you need, work out the points you already have from the grading periods, subtract them from your target, and divide what is left by the exam weight.
Exam score needed = (T − P) ÷ We × 100
T = target semester grade (%), P = points so far = (G1 × W1 + … + Gn × Wn) ÷ 100, We = exam weight (%).
Example: exam score needed for a 90%
Quarter 1 is 85% and Quarter 2 is 91%, each weighted 40%. The exam is worth 20% and the target is 90%.
- Points so far: 85 × 40 ÷ 100 + 91 × 40 ÷ 100 = 34 + 36.4 = 70.4
- Points still needed: 90 − 70.4 = 19.6
- Exam score needed: 19.6 ÷ 20 × 100 = 98%
If the answer is above 100%, the exam alone can’t lift you to the target, and the calculator shows the highest semester grade still possible. If it is 0% or less, you have already secured the target.
Letter grades
Results are labelled with the grading scale that Florida law sets for public middle and high schools [1]. Each band starts at its published lower bound and nothing is rounded, so 89.99% shows as a B.
| Letter | Percent |
|---|---|
| A | 90–100 |
| B | 80–89 |
| C | 70–79 |
| D | 60–69 |
| F | 0–59 |
Schools set their own cut-offs, weights and rounding rules. The School District of Jefferson, for example, starts an A at 92% [2]. Check your school’s scale before relying on a letter.
Questions
How much does the final exam count toward a semester grade?
It depends on the school. The School District of Jefferson in Wisconsin counts each high school quarter at 40% and the final exam at 20% [2]. Broward County Public Schools in Florida counts each quarter at 37.5% and the exam at 25% [3]. In Florida, the statewide end-of-course exam counts 30% of the final grade in Algebra I, Geometry, Biology I and U.S. History [4].
Why do semester weights differ between schools?
Districts, schools and sometimes individual teachers set them. Some courses have no exam at all: in Jefferson, a grades 6–8 semester grade is simply half of each quarter [2]. Use the weights in your syllabus or student handbook. If your course has no exam, set the exam weight to 0%.
What if my weights don’t add up to 100%?
The calculator shows the current total and waits for you to fix it. It never rescales weights on its own, because a total other than 100% usually means a missing grading period or a typo.
Can I use points instead of percentages?
Convert each period to a percentage first: points earned ÷ points possible × 100. If the whole course is graded on total points rather than fixed weights, each period counts in proportion to its points, so add up all points earned and divide by all points possible instead.
Is a semester grade the same as a cumulative GPA?
No. A semester grade is one course over one semester, as a percentage. A cumulative GPA averages grade points across all your courses and semesters, usually weighted by credit hours, so it needs a separate calculation.
My school uses three or four grading periods. Does that work?
Yes. Add up to four periods, such as six-week terms, and give each one its own weight. If your school says “the quarters count 80% together”, that is 40% for each of two quarters.