Grade Calculator for Weighted Courses and Final Exam Targets
Most syllabi do not say your grade is the average of your scores. They say homework is 20%, the midterm 30%, the final 40%, and then leave the arithmetic to you. This calculator does that arithmetic. Enter what has been graded so far and it returns your current average, the matching letter grade and the working behind the number.
It suits students checking a course mid-semester, parents following along, and teachers who want a quick sanity check before posting grades. If part of the course is still ahead, add a target and it works out the average you need on the remaining work.
- Percentage, letter or points
- Weighted categories
- Target score solver
- Runs in your browser
How to use the grade calculator
Five steps, about a minute from start to result.
- 1
Choose how your grades are reported
Pick
Percentageif your gradebook shows scores like 87%,Letterif it only shows grades like B+, orPointsif it shows raw scores like 42 out of 50. Letters are the roughest input, because one letter covers several percentage points, so treat a letter-based result as an estimate. - 2
Add one row per graded item or category
Name it if you like (optional), then enter the grade and its weight.
Add Assignmentadds a row and the red X removes one. If the syllabus says homework is 20%, enter your homework average once with a weight of 20 instead of listing every worksheet. - 3
Check that the weights make sense
Weights that total 100 describe the whole course. A smaller total means you are looking at graded work only and part of the course is still ahead.
- 4
Optional: type the grade you are aiming for
Enter a target such as 85 in the remaining-work field. The calculator then shows the average you need on the weight that is still ungraded, which is the usual "what do I need on the final" question.
- 5
Pick decimals, calculate, read the working
Choose 0, 1 or 2 decimal places and press
Calculate Grade. You get the average, the letter grade and the calculation line. Use two decimals when you are close to a cutoff, andResetto start another course.
The math behind the result
Three formulas cover everything the calculator does.
Weighted average
Σ(grade × weight) ÷ Σ(weight)Each score counts in proportion to its weight. Dividing by the weights you entered gives your average on the work graded so far, whether those weights total 100 or not.
Score needed on remaining work
(target − earned) ÷ remainingEarned is Σ(grade × weight) ÷ 100. Remaining is (100 − weights entered) ÷ 100. If the answer passes 100, the target cannot be reached.
Percentage from points
points earned ÷ points possible × 100For a course graded in raw points, pooled totals do the weighting for you: a 100-point project naturally counts more than a 25-point quiz.
Weight decides how much a single score matters. A 20-point swing on a 5% quiz moves the course grade by 1 point. The same swing on a 30% midterm moves it by 6.
Worked examples
Three situations with the numbers shown, so you can check them against your own.
Percentage mode
Mid-semester check with 40% of the course still ahead
- Homework
- 90% · weight 15
- Quizzes
- 78% · weight 15
- Midterm
- 72% · weight 30
Average on graded work: 78.0% (C+)
To finish at 80%, you need 83% on the rest
To finish at 85%, you need 95.5% on the rest
Learning in October that 85% needs a 95.5% average is more useful than finding out in December. It is the moment to adjust the goal or move study time to the heaviest remaining item. A required score above 100% tells you the same thing: that target is gone, so aim at the next grade down.
Points mode
A course graded in raw points
- Lab
- 46 / 50
- Project
- 88 / 100
- Quiz
- 17 / 25
- Total
- 151 / 175
151 ÷ 175 × 100 = 86.29% (B)
Percentage mode
What one zero costs
Five equal items: 92, 88, 95, 90, and one missing.
That is 18.25 points lost, and a drop from A- to C.
Percentage to letter grade reference
Drag the slider to see where a score lands on the common US plus/minus scale.
Band for B+: 87–89%
- A+97–100%
- A93–96%
- A-90–92%
- B+87–89%
- B83–86%
- B-80–82%
- C+77–79%
- C73–76%
- C-70–72%
- D+67–69%
- D63–66%
- D-60–62%
- F0–59%
Many schools use plain letters instead: A 90–100, B 80–89, C 70–79, D 60–69, F below 60. Some drop the A+ or move cutoffs, so your syllabus always overrules this table.
Four slips that skew a grade calculation
Most wrong results come from the inputs, not the formula.
- Averaging the averages
- A plain average of homework, quizzes and exams ignores that exams usually carry far more weight. Weight each category by the percentage in the syllabus.
- Listing every item inside a weighted category
- Ten homework rows at a weight of 20 each would claim 200% of the course. Enter the category average once.
- Forgetting dropped scores
- The calculator does not drop anything automatically. If your instructor drops the lowest quiz, delete that row or average the remaining quizzes first.
- Reading 90 as automatically an A
- On a plus/minus scale 90 is an A-, and an A usually starts at 93. The syllabus has the final say.
Grade calculator questions
Short answers to what students most often ask.
Use (target − current × (1 − final weight)) ÷ final weight, with the weight as a decimal. With an 88% average, a final worth 25% and a goal of 90%, that is (90 − 88 × 0.75) ÷ 0.25 = 96%. If the answer is above 100%, the goal is out of reach without extra credit or a curve. If it is below 0, you have already locked it in. In this calculator, enter only the work already graded and type your goal into the remaining-work field.
That is normal mid-semester. The calculator treats the total you enter as the graded part of the course, so you see how you are doing on completed work. The unfilled remainder is what the remaining-work field uses. If the total is above 100, recheck the syllabus, because something has probably been entered twice.
It depends on the school. On the common US scale the lowest passing grade is a D- at 60%, so 70% (a C-) passes the course. Programs are often stricter than courses: many majors, prerequisites and scholarships ask for a C or better. Check the handbook for the rule that applies to you, then use the calculator to see whether your current average clears it.
On a plus/minus scale a 90 is an A-, and an A usually starts at 93. On a plain A to F scale, 90 is an A. Your syllabus decides which one applies. Near a cutoff, set the calculator to two decimals, because 89.6 and 90.0 can land on different sides of the line, and some instructors round while others hold the cutoff exactly.
Remove the dropped score before averaging. If a category drops the lowest of five quizzes (68, 74, 81, 88, 97), average the other four to get 85.0%, then enter that once with the category weight. The calculator will not drop anything on its own, so delete the row for any dropped item.
A grade calculator works inside one course and turns assignment scores and weights into a single percentage and letter. A GPA calculator works across courses: it converts each final letter into grade points and averages them by credit hours. The usual order is to find each course grade first, then carry those letters into a GPA tool. This page covers the first step.
Treat it as a reliable check, not a record. Your school gradebook is the official source, and it may include things a calculator cannot see: extra credit, curves, dropped scores, late penalties or instructor rounding. If the two numbers differ by more than a point or so, compare category weights and individual entries first, since that is where mismatches usually come from.
