Use the points, percentages, weighted categories or rubric scores to determine a class grade. Plan your final exam score and see your letter grade instantly. When your school’s portal provides points, percentages, category weights, or standards-based rubric scores use this K–12 grade calculator. It can be used by students, parents and teachers who need a rapid approximation of a current grade, a weighted average or the score necessary on the next test.
Important: There are significant differences in grading policies across different schools, districts, curricula (IB, AP, IGCSE, A-Level, American, British), and countries. Check category weights, grades scales, rounding procedures, and retake policies with your teacher and/or school administration. This calculator provides estimates for typical grading procedures. It is intended to be used as a planning document and not as a final grade.
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K-12 Grade Calculator that thinks ahead
Work out your class grade the way your teacher’s gradebook does — weighted categories, total points, or standards-based mastery — then see exactly what you need to hit your goal.
Each category (tests, homework…) gets a weight from your syllabus. Scores inside a category are added up as points.
Use this when every assignment simply counts by its points — your grade is total earned ÷ total possible. Tap EC to mark extra credit (adds points without adding to the total).
For standards-based report cards. Pick the mastery level your teacher gave for each standard. Tap a level again to mark it “not yet assessed”.
What you need for every letter
What if I score…
Understanding K–12 Grading Systems
There are three primary models of grading that are used in most K-12 schools: point-based systems, weighted category systems, and standards-based (rubric) grading. Each one is different and you must know which one your teacher uses so you’re able to track your grade correctly.
Points-Based Grading
Under a points system, each assignment is allocated a number of points. Your grade is the number of points you received out of the maximum of points. If you had 450 out of 500 points for all of your assignments, your grade would be 90% (450 ÷ 500 = 0.90). All marks are equal, unless told otherwise by your teacher. Khan Academy states that this is one of the more common ways students are graded in middle and high school math and science classes.
Weighted Category Grading
Weighted grading involves some assignments being more important than others. Some high school courses may assign a weight of 40% to tests, 25% to quizzes, 20% to homework, and 15% to a final exam. Your overall grade will be determined by averaging the percentage you earned in each category, multiplying that percentage by the weight for each category, and totaling the results. For example, if you get a 85% on tests (weight 40%), that means that tests contribute 34% of your final grade. In this way, greater weightage is given to higher stakes assessments than to lower stakes assessments.
Standards-Based and Rubric Grading
Progressive K–12 schools are more likely to use standards-based grading. It assesses learning for specific learning objectives rather than a mean of all assignments. Students are provided with a rubric score which is typically between 1-4 or 1-5. The beginning, developing, proficient and advanced levels are the degrees of mastery. It allows for more effective feedback on the progress of skills, as Edutopia describes. It also provides students with multiple opportunities for demonstrating mastery without facing consequences for their initial attempts.
Common Grading Pitfalls
There are a few common situations where students will miscount grades:
- The category weights are not summing to 100%.
- Assignments that are missed are not included. These are typically noted as 0’s.
- Extra credit is not understood. May work differently from how the student thinks.
- Percentages that are not weighted. While a 90% on a 5-point homework grade may be considered a good grade, a 90% on a 100-point final exam may not.
Dropped or excluded scores are not counted towards the score. Some teachers drop off the lowest quiz grade and do not include some assignments in the calculation and your own calculation must account for this.
Standard Grade Scale Reference
A grading scale that is adopted by many American schools is represented in the table below. However, there are also a great variety of grade scales. The grading scale for some schools is 7 point (93 – 100 = A), while others may have a 10 point grading scale (90 – 100 = A), and various international curricula like the International Baccalaureate or the British system could use any other grading system (1–7 for IB, A* – U for Cambridge). Please use your school’s official scale.
| Letter Grade | Percentage Range | GPA Equivalent (4.0 scale) | Descriptor |
| A+ | 97–100% | 4.0 | Outstanding |
| A | 93–96% | 4.0 | Excellent |
| A− | 90–92% | 3.7 | Very Good |
| B+ | 87–89% | 3.3 | Good |
| B | 83–86% | 3.0 | Above Average |
| B− | 80–82% | 2.7 | Satisfactory |
| C+ | 77–79% | 2.3 | Fair |
| C | 73–76% | 2.0 | Average |
| C− | 70–72% | 1.7 | Below Average |
| D+ | 67–69% | 1.3 | Poor |
| D | 63–66% | 1.0 | Minimal Pass |
| D− | 60–62% | 0.7 | Very Poor |
| F | Below 60% | 0.0 | Failing |
Category Weight Examples
Below is the table of the distribution of weights for the various subjects. Problems with tests and final exams in science and math courses and more emphasis on essays and projects in English and social studies courses. Course weights might vary; please consult your syllabus.
| Subject | Tests/Exams | Quizzes | Homework | Projects/Essays | Final Exam |
| Mathematics | 40% | 25% | 15% | 5% | 15% |
| Science | 35% | 20% | 15% | 10% | 20% |
| English | 25% | 15% | 20% | 25% | 15% |
| History/Social Studies | 30% | 20% | 15% | 20% | 15% |
What Score Do I Need on My Next Test?
Preparing for success is essential to a good grade. If you want to know what you have to score on the next assessment so that you can obtain your desired grade; you must have three numbers: your current assessment score, your desired grade, and the remaining assessment weight.
Planning disclaimer: This method assumes that all the remaining assessments are of equal weight within the specified weight. If you have multiple tests with specific individual weighting, work out the individual tests. Some teachers round final grades, curve grades or have policies (e.g. dropping the lowest grade) that alter a final. Talk to your teacher to discuss improvement strategies for the grade.
How to Calculate Your K–12 Grade
Collect all the data on the assignment.
Gather the points and score for each evaluated item, as well as the category. Please verify any information on your school’s Web site, syllabus or grade sheet for accuracy, including any dropped scores or extra credit.
Identify category weights.
Determine if your course is weighted or not, and understand what the percentages are for each weighted component (tests, quizzes, homework, projects, and final exam). Ensure that the weights total 100%.
Find the percentage of points for each category.
Calculate points earned for each category by dividing the points earned by the points possible and multiplying by 100. For instance, if you scored 180 points on a quiz and it was worth 200 points, your quiz percentage is 90%.
Enter the values for weights and sum them up.
Multiply each of the percentages in each category by the weight, and sum the results. For instance, 85% in tests (40% weight) contributes 34 points (0.85 × 40 = 34). Repeat this for each category, and you have your weighted average!
Review rounding and grading scales policies.
Check your teacher’s rounding rule to see if they round to the nearest whole number at 0.5% (for instance, 89.5% would be rounded to 90%) or if they have another rule for rounding. Check what percentage you worked out and then use your school’s grade scale to determine the letter grade.
Strategies to Improve Your Grade
You have to work on a regular basis and concentrate on those areas where you want to improve your grade. The methods outlined below have proved effective in students’ learning in a wide variety of subjects, including IB, AP, IGCSE, A-Level and American courses.
Prioritize High-Weight Categories
Spend more study time on the categories with the highest weights. Each of the categories has a weight of 40%. If the test average in one of the categories goes from 75% to 85%, a total of 4 percentage points are added to the final grade. The same 10-point change in homework (at 10%) only contributes 1 point. Identify areas in which you can get the most out of your grade by making minor changes.
Immediately correct Knowledge Gaps.
If you receive written feedback on a work of assessment, review the solutions to the incorrect questions and try to redo the problems until you fully understand the concepts. Most teachers provide opportunities for revision, partial credit, and/or extra practice to demonstrate understanding. Our tutors at The Numbers Institutes and Education LLC are specifically licensed by the KHDA to provide targeted support to IB, AP, IGCSE, A-Level and American curriculum students who require improved skills or are preparing for future high-stakes exams.
Complete Missing Assignments
Late work may be penalised with no marks, and this can have a significant impact on the final grade. In a 4-point category, a single zero would lower the category to 75% (as long as the other three assignments were all 100%). Inquire with teachers about late work guidelines. Many schools allow for partial credit on late assignments, and a 70% late assignment is much better than a zero.
Take advantage of Extra Credit and Bonus opportunities.
If an extra credit is offered, make it as a requirement not an option. Just a little more work can elevate the borderline student (89.4%) to the next letter grade (90%). Earn these points by attending optional review sessions, participating in class discussion or doing extra assignments.
Take Practice Tests and Past Papers.
There are extensive archives of previous paper questions for standardized courses like IB, AP, Cambridge, and more. Practicing with a timer becomes familiar with the types of questions, how to manage your time and develops content areas that are repeated and repeated! In the past, students who work regularly with targeted practice materials, like score calculators for specific tests and curriculum-focused materials, have consistently outperformed their peers in high-stakes tests
Frequently Asked Questions
How do I calculate my grade in school?
Ask your course if it has points or weighted categories. If the assignment is to be graded out of points, calculate your points earned divided by your points possible and multiply by 100 to get a percentage. If you are using weighted grading, then work out a percentage for each category, then multiply each percentage by the appropriate weight (as a decimal), and then add them together. Compare your result with your school’s grade scale. Always include missed scores, bonus scores, and missing assignments as zeros.
What is a weighted grade and how does it work?
Weighted grade is an assignment grading system that assigns different weight points to various categories of assignments. For instance, tests may be 40% and homework 20%, since mastery is better demonstrated in tests. A weighted grade is the average percentage in each category multiplied by the weight of that category, then add up all of the weighted values. The formula is:
(Category₁% × Weight₁) + (Category₂% × Weight₂) + … = Final Grade%
How do you convert points to a percentage grade?
Divide the points you got by the points you could have gotten and multiply by 100. For example, if you earned 47 out of 50 possible points, calculate (47 ÷ 50) × 100 = 94%. That percentage can then be compared to the letter grade scale for your school. If there are multiple assignments, sum up the points you earned and the points you could earn for each one, before dividing them.
How do I calculate my semester grade?
Typically, grades are a combination of marking period grades and a semester exam. A typical formula is:
(Quarter₁ × 0.40) + (Quarter₂ × 0.40) + (Semester Exam × 0.20) = Semester Grade
However, the weighting of the Semester may differ from school to school. Some schools give equal marks to the two quarters (33.3% for each), some give unequal marks. Read your school handbook or inquire from your teacher for the official semesters calculation policy.
What score do I need on my final exam to get an A or B?
Use this formula:
Required Score = (Target Grade – Current Grade × (1 – Exam Weight)) / Exam Weight
For example, if you currently have 85%, want 90%, and the final is worth 20% of your grade, you need (90 − 85 × 0.80) ÷ 0.20 = (90 − 68) ÷ 0.20 = 110%. It is not possible to score 110% so 90% is not possible here. This formula is based on your current grade for the part of the course that is not the final.
Do all teachers use the same grading scale?
No. Grading scales differ widely from school to school, district to district, state to state, country to country and even teacher to teacher. Common American scales include the 10-point scale (90–100 = A) and the 7-point scale (93–100 = A). International curricula are completely different: IB uses a scale from 1 – 7, British curricula uses letter grades A* – U with differing percentage ranges and some schools have a standards-based grading system. Please check your course’s grade scale at the beginning of the term.
How does extra credit affect my grade calculation?
Extra credit typically is given as points in one of two categories – bonus points to one category or to the total point count, depending on the teacher’s policy. In categories – if a category is applicable (e.g. 5 bonus quiz points) then tally those points to both earned and possible points before working out the percentage of the category. If this is a direct grade enhancement (e.g., +2% for final grade), then apply it to your weighted average after you have calculated it. Check with your teacher if there is a limit to extra credit.
Can I drop my lowest quiz score?
Some teachers eliminate the lowest grade for some tests, typically quizzes or homework. If you have a dropped score, then you should use the lowest score to calculate your grade by subtracting it from your earned score and also from your maximum possible score. Then find the percentage for each category, based on the remaining scores. For example, with quiz scores of 8/10, 9/10, 6/10, and 10/10, dropping the lowest (6/10) leaves 27 out of 30 points (90%).
How does rubric grading work in K–12 schools?
Rubric (standards-based) grading: Reporting of mastery or achievement of specific learning objectives on a scale of 1-4 or 1-5. The numbers represent various levels of achievement, with 4 = Advanced, 3 = Proficient, 2 = Developing, and 1 = Beginning. Your grade indicates how well you are doing and can be presented as your latest grade or as an average of several grades. A few schools grade the rubric in more traditional percentages (e.g., 4 = 95% proficiency level, 3 = 85% proficiency level, 2 = 75% proficiency level, 1 = 65% proficiency level) that are included on the transcript, in addition to the rubric score.