Free Online Calculators
Weighted grade, score needed on the final exam and test score to letter grade
Your grade is the weighted average of all graded parts: multiply each grade by its weight and divide by the total weight. The score you need on the final is (target − current × (1 − w)) ÷ w, so with 84% and a final worth 25% you need 68% for an 80%. The calculator also converts test scores to percentages and letter grades.
With 87% before the final and a final exam worth 25%, you need 99% on the final for a 90% in the class, 59% for an 80% and 19% for a 70%. Formula: needed = (target − current × (1 − w)) ÷ w. Your current grade is the weighted average of all graded parts.
| Current grade | For 90% (A−) | For 80% (B−) | For 70% (C−) |
|---|---|---|---|
| 70 % | 150% (not reachable) | 110% (not reachable) | 70% |
| 75 % | 135% (not reachable) | 95% | 55% |
| 80 % | 120% (not reachable) | 80% | 40% |
| 82 % | 114% (not reachable) | 74% | 34% |
| 85 % | 105% (not reachable) | 65% | 25% |
| 87 % | 99% | 59% | 19% |
| 90 % | 90% | 50% | 10% |
| 92 % | 84% | 44% | 4% |
| 95 % | 75% | 35% | 0% |
Multiply each grade by its weight, add the results and divide by the sum of the weights. Homework 92% (20%), quizzes 85% (20%) and a midterm 78% (30%) give (92 × 20 + 85 × 20 + 78 × 30) ÷ 70 = 84%.
Use needed = (target − current × (1 − w)) ÷ w with the final exam weight w as a decimal. With 84% now and a final worth 25%, you need 68% on the final to finish with 80%.
Use the points each assignment is worth as its weight. The weighted average then equals the total points you earned divided by the total points possible.
Divide the points or correct answers by the total and multiply by 100. 42 out of 50 are 84%, which is a B on the common US scale.
On the common US scale a B+ starts at 87% and runs to just under 90%. A B starts at 83% and a B− at 80%. Schools may use different cutoffs.
Then the result is your grade so far, based only on the parts already graded. Add the remaining parts, such as the final exam, once they are graded.
Most classes weight their parts differently: homework might count for 20%, quizzes for 20%, the midterm for 30% and the final exam for 30%. Your grade is the weighted average of those parts. Multiply each grade by its weight, add the products and divide by the sum of the weights. With homework at 92% (weight 20), quizzes at 85% (weight 20) and a midterm at 78% (weight 30), the grade so far is (92 × 20 + 85 × 20 + 78 × 30) ÷ 70 = 84%, a B.
If the weights you enter do not add up to 100%, the calculator shows your grade so far based on the parts that are already graded. That is exactly what you want in the middle of a semester, when the final is still ahead.
The final exam calculator answers the most common question before exam week. It needs three numbers: your current grade, the weight of the final and the grade you want. The formula is needed = (target − current × (1 − w)) ÷ w, with the weight w as a decimal. With a current grade of 84% and a final worth 25%, you need (80 − 84 × 0.75) ÷ 0.25 = 68% for an 80% in the class. For a 90% you would need 108%, which is not possible without extra credit. The calculator also lists the score you need for an A, B, C and D at a glance.
Teachers and students often need to turn a raw score into a percentage. Divide the points or correct answers by the total and multiply by 100: 42 correct answers out of 50 are 84%, a B. The calculator also shows how many answers or points were missed, which helps when checking a grading key.
Some classes do not use percentage weights but total points, for example 1,000 points over the semester. In that case, use the points each assignment is worth as its weight. A test worth 200 points on which you scored 90% counts four times as much as a quiz worth 50 points. The weighted average then equals your total points earned divided by the points possible.
The calculator uses a widely used US scale with plus and minus grades: A+ from 97%, A from 93%, A− from 90%, B+ from 87%, B from 83%, B− from 80%, C+ from 77%, C from 73%, C− from 70%, D+ from 67%, D from 63%, D− from 60% and F below 60%. Many schools use their own cutoffs or round grades up, so check the syllabus when a result sits right at a boundary.