Introduction
This grading scale calculator turns your test scores into letter grades, percentages, and GPA points. Type in your points earned and total points, and it shows your grade right away. It also shows the steps, so you can see how the math works.
You can pick the scale your school uses. Choose a standard A to F scale, a plus/minus scale, a 7-point scale, a 10-point scale, or pass/fail. You can also build your own custom scale and set the minimum percent for each grade.
The tool has four parts:
- Single Score: Change one score into a percent, letter grade, and GPA points.
- Assignments: Add all your homework, quizzes, and tests to find your course grade. Works with total points or with weights.
- GPA: Add your classes and credit hours to get your GPA. Honors and AP/IB classes can add extra points.
- Grade Needed: Find out what score you need on your final exam to hit your target grade. You can also test a score to see how it changes your final grade.
Students, parents, and teachers can use it to check grades fast and plan ahead. Every result comes with a step-by-step answer, so you can follow the math yourself.
How to use our Grading Scale Calculator
Type in your scores, points, or letter grades, and the calculator shows your percentage, letter grade, GPA points, and a step-by-step solution.
Grading Scale Preset: Pick the scale your school uses, like Standard, Plus/Minus, 7-Point, 10-Point, or Pass/Fail. Every result on the page uses this scale.
Pass/Fail Threshold (%): Enter the lowest percent needed to pass. This only matters when you choose the Pass/Fail scale.
Reverse Lookup: Choose a letter grade to see what percent range and GPA points it equals.
Custom Scale Builder: Type your own grade labels, minimum percentages, and GPA points, then click Apply Custom Scale. The lowest row must start at 0%.
Points Earned: On the Single Score tab, enter how many points you got on the test or assignment.
Total Points Possible: Enter how many points the test or assignment was worth.
Rounding for Letter Grade: Choose to use the exact percent or round to the nearest whole percent before finding your letter grade.
Calculation Mode: On the Assignments tab, pick Unweighted to add up all points, or Weighted if each part counts for a set percent of your grade.
Assignment Rows: Type the assignment name, points earned, and points possible. In weighted mode, also enter each weight so they add up to 100%.
GPA Type: On the GPA tab, choose Unweighted, or Weighted to add +0.5 for Honors and +1.0 for AP/IB classes.
Course Rows: Enter the course name, letter grade, credit hours, and course type for each class you took.
Current Grade (%): On the Grade Needed tab, enter the grade you have right now. You can also click the button to pull it from the Assignments tab.
Weight of Remaining Assessment (%): Enter how much your final exam or last project is worth in the class.
Target Final Grade (%): Enter the final grade you want to end with. The calculator shows the score you need.
Hypothetical Exam Score (%): Enter a score you think you might get to see how it changes your final grade.
Calculate and Reset: Click Calculate to update every result, or Reset to start over with the sample data.
What Is a Grading Scale?
A grading scale turns a score into a letter grade. It takes your percent, like 87%, and matches it to a letter, like B. Most schools use a scale so every student is judged the same way. Teachers also link each letter to GPA points, which is how schools track your grade average over time.
How Percent Grades Work
First you find your percent. Divide the points you earned by the points the test was worth, then multiply by 100. If you got 45 out of 50, that is 45 ÷ 50 = 0.9, or 90%. Then you look at the scale to see what letter 90% earns.
Common Grading Scales
- Standard 10-point scale: A = 90 to 100, B = 80 to 89, C = 70 to 79, D = 60 to 69, F = below 60. This is the most common scale in the U.S.
- Plus/minus scale: Splits each letter into three parts, like B+, B, and B−. It gives a closer look at how you did.
- 7-point scale: A = 93 to 100, B = 85 to 92, C = 77 to 84, D = 70 to 76, F = below 70. Some schools and colleges still use this stricter scale.
- Pass/Fail: You only need to beat one line, often 60%. You pass or you do not.
Scales are not the same everywhere. Your teacher's syllabus is the one that counts.
Weighted vs. Unweighted Grades
Unweighted means all points go in one pile. Add up every point you earned, add up every point possible, and divide. A 100-point final counts five times more than a 20-point quiz, just because it is worth more points.
Weighted means each category is worth a set share of the course. For example: homework 20%, quizzes 30%, and the final exam 50%. You multiply each percent by its weight, add them up, then divide by the total weight. Weights should add up to 100%.
How GPA Points Work
GPA stands for grade point average. Each letter is worth points: A = 4, B = 3, C = 2, D = 1, F = 0. To find your GPA, multiply each course's grade points by its credit hours. Those are called quality points. Add all the quality points, add all the credits, and divide.
A weighted GPA gives extra points for harder classes. Honors classes often add 0.5, and AP or IB classes often add 1.0. That is why some students have a GPA above 4.0.
Figuring Out the Grade You Need
If you know your current grade and how much the final exam is worth, you can find the score you need. The part of the course already done is locked in. Take your target grade, subtract what is locked in, and divide by the weight that is left. If the answer is over 100%, the target is out of reach. If it is 0 or less, you already have it.
Why Rounding Matters
An 89.5% can be a B or an A, depending on the rule. Some teachers round to the nearest whole percent before checking the scale. Others use the exact number and do not round at all. A half point can change your letter, so ask your teacher which rule they use.
Tips for Students
- Check the weights. The biggest weight deserves the most study time.
- Track your grade after each test, not just at the end of the term.
- Small assignments add up. Missing a few zeros can drop a letter grade.
- Know the cutoff. If you sit at 79.4%, you know exactly how far you must climb.