Grade Calculator
Convert points earned into a percentage and a letter grade.
The Grade Calculator converts raw points into a percentage and a letter grade, so you can see where a test, assignment, or rubric score actually lands. Points alone rarely tell you much — 83 out of 95 and 83 out of 110 feel similar and are not — and instructors report scores in whatever format suits their marking scheme. This page explains the percentage conversion, the plus/minus letter scale applied here, and the important limitation that weighted categories and curved grading require an extra step before the letter means what you think it means.
How to use this calculator
- Enter the points you earned.
- Enter the total points possible.
- The result shows the percentage and the letter grade on the scale below.
The formula
Percentage = (Points earned ÷ Points possible) × 100- Scale
- A ≥ 93, A− ≥ 90, B+ ≥ 87, B ≥ 83, B− ≥ 80, C+ ≥ 77, C ≥ 73, C− ≥ 70, D+ ≥ 67, D ≥ 63, D− ≥ 60, F < 60
How it works
The score is a simple percentage. The letter grade then maps that percentage onto the common US plus/minus scale shown in the formula box.
Grading scales are set by each school or instructor — treat the letter as a common-convention guide, not a guarantee.
Worked example
You earned 83 points out of 95 on a midterm.
- 183 ÷ 95 ≈ 0.8737
- 20.8737 × 100 ≈ 87.37
87.37%, which maps to a B+ on the scale used here.
From points to a percentage
The percentage is points earned divided by points possible, times 100. Scoring 83 out of 95 gives 83 ÷ 95 = 0.8737, or 87.37%.
Partial points are fine — rubrics often award half marks — and the calculator accepts decimals. What it cannot do is guess at extra credit that pushes you above the stated total, so include any bonus points in both figures if your instructor counts them that way.
The letter-grade scale
This tool uses the common US plus/minus scale: A ≥ 93, A− ≥ 90, B+ ≥ 87, B ≥ 83, B− ≥ 80, C+ ≥ 77, C ≥ 73, C− ≥ 70, D+ ≥ 67, D ≥ 63, D− ≥ 60, and F below 60.
Scales are set locally. Some schools use straight ten-point bands with no plus or minus, some set the A boundary at 90, and some curve to a distribution. Always check your syllabus before treating the letter as authoritative.
Weighted categories and course grades
Most courses weight categories — for example homework 20%, midterm 30%, final 50%. Averaging every point together ignores those weights and gives the wrong answer. Work out the percentage within each category first, then multiply each by its weight and add the results.
To find what you need on a remaining assessment, set up the same weighted sum with your target grade on one side and solve for the unknown score. The result tells you quickly whether a target is still reachable.
Weighted categories in practice
Most courses weight categories rather than averaging every score equally. If homework is 20%, midterms 40%, and the final 40%, a perfect homework record moves the overall grade by at most 20 points.
Multiply each category average by its weight, sum the products, and divide by the total weight. The calculator does this so a strong performance in a low-weight category is not over-counted.
Check the syllabus for dropped scores — many courses discard the lowest quiz, which changes the category average meaningfully.
Working out what you need on the final
Rearrange the weighted average: required final score = (target overall minus earned so far) divided by the final's weight.
If you have 78% across 60% of the course and want 80% overall, you need (80 - 46.8) / 0.4 = 83% on the remainder.
When the required score exceeds 100%, the target is out of reach; recalculate with a realistic goal rather than assuming an error.
Percentages, letters, and GPA
Letter boundaries vary between institutions, so the same 89% can be an A- or a B+ depending on the scale in force.
Grade point averages convert letters to points, usually on a four-point scale, then weight by credit hours rather than by percentage.
Converting a percentage straight to a GPA without the institution's mapping produces a plausible but incorrect figure.
Common mistakes when calculating grades
Averaging category averages without weights, which treats a 5% quiz block as equal to a 40% exam.
Including ungraded or excused items as zeros, which understates the current standing.
Assuming curves or rounding will apply. Plan on the raw arithmetic and treat any adjustment as a bonus.
Using the result to plan effort
Rank remaining assessments by weight per hour of work. The highest-weight item with the most room for improvement deserves the time first.
A category already near full marks has little headroom, so extra effort there returns almost nothing to the overall grade.
Recalculate after each returned assessment so the plan reflects reality rather than the position at the start of term.
Glossary and verification
Weight: the share of the final grade a category carries. Category average: the mean score within a category. Overall grade: the weighted sum. Required score: what remains necessary to hit a target.
Verify by confirming the weights sum to 100%. If they do not, the overall figure will be wrong.
Verify a required-score result by plugging it back in as if it were achieved and checking the overall grade lands on the target.
Points-based courses and how they differ
Some courses allocate raw points rather than weighted percentages. There, every point is equal and a 200-point final simply counts twenty times a 10-point quiz.
To convert, divide each category's available points by the total points to obtain its effective weight, then treat it as a weighted average.
Mixing the two systems — applying percentage weights to a points course — produces a grade that looks plausible but does not match the gradebook.
Rounding, curves, and borderline grades
Institutions differ on whether 89.5 rounds to an A. Some round, some truncate, and some apply neither. Assume the least favourable rule when planning.
Curves adjust the whole cohort and cannot be predicted from your own score. Treat any curve as an unbudgeted bonus.
If you are close to a boundary, the highest-weight remaining assessment is where the marginal effort pays; a small quiz rarely moves a borderline case.
Tracking a grade across a whole term
Recording each score as it is returned, alongside its weight, keeps the running grade accurate and removes end-of-term surprises.
A running total also shows the effect of each assessment before it is taken, which is far more useful than discovering the position after the final.
Where a syllabus drops the lowest score in a category, keep the dropped score visible in your own record so you know how much protection remains.
Late penalties, resubmissions, and extra credit
Late penalties are usually a fixed percentage per day and apply to the raw score before weighting, so their effect on the overall grade is scaled by the category weight.
Resubmission policies vary: some cap the revised mark, others replace it fully. The cap changes whether a resubmission is worth the effort.
Extra credit is normally added to a specific category rather than to the overall grade, so its impact is again scaled by that category's weight.
Interpreting a predicted grade honestly
A predicted grade assumes future performance matches the assumption you entered. Entering an optimistic score for the final produces an optimistic prediction, not a forecast.
Run two scenarios — a realistic one and a poor one — so you know both the likely outcome and the floor.
If both scenarios miss the target, act early. Options such as tutoring, deadline extensions, or withdrawal all narrow as the term progresses.
Weighted components and what you need to pass
Most courses weight coursework and examinations differently, so a mark is only meaningful once multiplied by its weight.
To find the mark needed on a remaining assessment, subtract the weighted points already earned from the target, then divide by the remaining weight.
If the required mark exceeds one hundred percent, the target is unreachable and it is worth speaking to the tutor early.
Some courses also set a minimum on individual components, so a strong average does not always guarantee a pass.
Grade scales and conversion
Percentage marks, letter grades, and grade points map onto each other differently between institutions, so conversions are approximate.
Rounding rules matter at boundaries: some institutions round 69.5 up to a higher band, others do not round at all.
Where a grade point average is used, each grade is converted to points and weighted by credit value rather than by assessment weight.
Keep the raw marks, since converted grades lose the information needed to recompute an average accurately.
Planning effort across a course
Effort is best spent where weight is highest, so a lightly weighted piece rarely justifies the same time as one carrying a third of the module.
Calculating the needed mark before each remaining assessment turns a vague worry into a concrete target that can be planned around.
Resit and capping rules differ between institutions, and a capped resit mark changes the arithmetic for the rest of the course.
Keeping a running record of marks and weights means the final grade is never a surprise at the end of the year.
When this calculator is useful
- Checking test scores
- Estimating current course standing
- Setting target scores
- Converting rubric points to percentages
Frequently asked questions
What percentage is a B?
On the scale used here, 83–86.99% is a B and 87–89.99% is a B+. Your school may differ.
Can I enter decimals?
Yes — partial points like 82.5 are fine.
Can I enter decimal points?
Yes. Half marks and other fractional scores are accepted for both points earned and points possible.
Does this handle weighted categories?
Not directly. Calculate each category's percentage first, then combine them using their weights.
How do I include extra credit?
Add the bonus points to the points earned and leave the possible total unchanged, if that is how your instructor applies it.
What grade do I need on the final to pass?
Express your current weighted grade, subtract it from your target, and divide by the final's weight to find the required score.
Is this the same as GPA?
No. GPA converts letter grades to grade points (typically A = 4.0) and averages them across courses, usually weighted by credit hours.
Why does my school's letter differ from this one?
Grading scales are set by each school or instructor. Use the percentage as the reliable figure and apply your own syllabus cutoffs.
How do I calculate a weighted grade?
Multiply each category average by its weight, add the results, and divide by the total weight.
What score do I need on the final to pass?
Subtract the points already earned from your target, then divide by the final's weight.
Why is my calculated grade different from the gradebook?
Common causes are dropped lowest scores, ungraded items counted as zero, or a category weight you have missed.
Do the weights have to add to 100%?
Yes, for the result to be meaningful. If your syllabus lists points instead, use points as weights.
Can I convert a percentage directly to a GPA?
Only using your institution's own mapping — scales differ, so there is no universal conversion.
How do points-based courses differ from weighted ones?
Each point counts equally; convert points per category into effective weights to use the same arithmetic.
Will my grade be rounded up?
It depends entirely on institutional policy — plan as though it will not be.
How much does a late penalty affect my overall grade?
The penalty applies to the raw score, and its effect on the total is scaled by that category's weight.
Does extra credit raise my whole grade?
Usually it is added within one category, so the overall effect is proportional to that category's weight.
How reliable is a predicted grade?
Only as reliable as the score you assume for remaining work — run a realistic and a pessimistic scenario.
How do I work out the mark I need?
Subtract the weighted points already earned from your target, then divide by the weight remaining.
Do institutions round grades?
Policies differ; some round at band boundaries and some do not, so check your course handbook.
Where should I focus effort?
On the most heavily weighted assessments, since they move the final grade the most per hour spent.