The arithmetic behind a weighted grade
Each category gets multiplied by its share of the course. Add those products, then divide by the share you have grades for. The sample syllabus loaded above works out like this:
(91 x 0.20) + (84 x 0.15) + (88 x 0.15) + (76 x 0.20) = 59.2
59.2 / 0.70 graded = 84.57%The divide step trips students up. Without it, a student halfway through term looks like they are failing, because 59.2 is out of 70 possible weighted points, not 100. Online gradebooks such as Canvas and PowerSchool run the same division when they show a "current grade" mid term.
A 76 on the midterm is the weakest score on the sheet. It still leaves a B, because three smaller categories near 90 cancel most of the damage. Change the midterm to 86 and the current grade climbs to 87.43%, a B+. One exam worth 20% moves the whole course almost three points.
Empty rows turn into the final exam planner
Students usually want one number from a grade calculator: the score the final has to hit. Leave any score box blank and the page treats that row as work still to come. The result card then answers the planning question with this formula:
needed = (target x total weight - points banked) / weight still open
B at 83%: (83 x 1.00 - 59.2) / 0.30 = 79.33%Two blank rows, say a final project worth 10% plus a final exam worth 20%, share the target. The figure shown is the average you need across both. Score higher on the project and the exam needs less, by a ratio set by their weights.
- Floor is your course grade if every open row comes back as zero. Skipping the final lands you here.
- Ceiling is the best grade still possible with perfect scores on the rest.
- Locked in on the ladder means the floor already clears the band. You keep the letter even with a zero.
- Out of reach means the band needs more than 100%. Only extra credit or a curve would get you there.
Weighted categories or total points
Read the grading section of your syllabus before typing anything. Courses split into two camps.
Weighted categories
The syllabus lists percentages: homework 20%, exams 50%, and so on. A category with ten assignments still counts for its fixed share.
Enter your category average as the score. Most portals print it next to the category name.
Total points
Everything is points: a 20 point quiz, a 150 point exam, 1,000 points in the term. Bigger assignments weigh more because they carry more points.
Switch the mode, type points earned and points possible. For an ungraded assignment, fill in only the possible column.
Mixing the two produces wrong answers with no warning. A 150 point exam entered as a 150% weight would swamp every other row. When the syllabus shows both, a points total inside each weighted category, use weighted mode and convert each category to a percent first.
Weights that do not add up to 100
Typos, dropped categories and participation grades nobody remembers all lead to weights summing to 95 or 110. The calculator divides by whatever total you enter, so the result stays a fair average of the rows on screen. The note under the colored bar tells you the actual sum. If your syllabus says 100 and the bar says 95, a category is missing, and your grade is a guess until you add it.
Percent, letter and 4.0 points side by side
The ladder follows the same plus and minus cut offs as the Toolexe test grade calculator, so a score reads the same letter on both pages. Your school publishes its own table. When the two disagree, theirs wins.
| Percent | Letter | 4.0 points | Five band letter |
|---|---|---|---|
| 97 to 100 | A+ | 4.0 | A at 90+ |
| 93 to 96.99 | A | 4.0 | |
| 90 to 92.99 | A- | 3.7 | |
| 87 to 89.99 | B+ | 3.3 | B at 80+ |
| 83 to 86.99 | B | 3.0 | |
| 80 to 82.99 | B- | 2.7 | |
| 77 to 79.99 | C+ | 2.3 | C at 70+ |
| 73 to 76.99 | C | 2.0 | |
| 70 to 72.99 | C- | 1.7 | |
| 67 to 69.99 | D+ | 1.3 | D at 60+ |
| 65 to 66.99 | D | 1.0 | |
| 60 to 64.99 | D- | 0.7 | |
| Below 60 | F | 0.0 | F |
Some colleges award 4.3 for an A+. Others skip the A+ entirely. The 4.0 figure on this page is a reading of one course, not a GPA. For a term average across several classes with credit hours, move to the GPA calculator.
Where this page gets your grade wrong
The math is exact. The inputs are where course grades go sideways. Check these before you trust a result, or before you skip studying for a final because the ladder says a C is locked in.
- Dropped scores. A rule like "lowest quiz dropped" changes the category average. Recalculate the category without the dropped score, then enter that.
- Curves. A curve set against the class average ignores fixed bands. No calculator predicts a curved letter before the class sits the exam.
- Final exam replacement. Some instructors swap your lowest exam for the final if the final is higher. Run the numbers twice, once with each policy.
- Minimum score rules. A syllabus stating "you must pass the final to pass the course" overrides any average this page shows.
- Standards based grading. Schools grading on 1 to 4 proficiency levels do not average percentages at all.
- Rounding. 89.5% reads as a B+ here. Plenty of teachers round it to 90. Ask before counting on it.
For a single test score from questions missed, the test grade calculator fits better. To average a list of quiz scores before typing them here, use the average calculator.
