Grade Calculator

Input format:

Components:

Weight interpretation:

Choose course-share for syllabus percentages; choose normalize for relative weights like 1, 2, 3.

Letter scale:

Use plus/minus for A-, B+, and similar marks; straight letters ignores signs.

Target grade:

Enter an overall course goal from 0 to 200, e.g. 90 for an A-range target.

Remaining course weight:

Enter 0 when pasted rows already represent the full course or course-share weights define the rest.

Drop lowest components:

Use a whole number from 0 to 8; dropped rows stay visible in the ledger.

Late penalty per component:

Enter 0 for none, or a shared deduction such as 10 for every listed late item.

Study cadence:

Use 1-14 days; the value changes recommendation text, not the grade math.

days

Scenario label:

Optional short name for exports, e.g. Midterm recovery plan.

Metric	Value	Copy
{{ row.label }}	{{ row.value }}
Warning {{ idx + 1 }}	{{ warning }}
Component: {{ row.name }}	{{ row.category }} \| entered {{ row.entered }} \| effective {{ row.effective }} \| share {{ row.share }} \| {{ row.impact }} \| {{ row.status }}

Priority	Action	Why	Copy
{{ row.priority }}	{{ row.action }}	{{ row.why }}

Add at least one valid component row to render the share map.

Scenario	Remaining avg	Projected grade	Band	Planning note	Copy
{{ row.label }}	{{ row.remainingAverage }}	{{ row.projectedGrade }}	{{ row.band }}	{{ row.note }}

Embed:

Customize

Include current inputs

Size

Advanced

Width

Height

Aspect ratio

Max height

Collapsible embed

Allow fullscreen

Referrer policy

Sandbox tokens

Course grades are built from policy as much as arithmetic. A quiz score, lab mark, essay grade, or exam result becomes part of the final average only after the course rules say how that work should count. Points, percentages, category weights, late deductions, missing work, and dropped scores can all move the answer, so the number shown in a gradebook is rarely just a plain average of visible marks.

The first split is between a score and a share. A score says how well a piece of work went. A share says how much that piece of work can move the final course result. A 95% homework grade may matter less than an 82% midterm if the midterm carries a larger course-share weight, while a small quiz can matter more than expected in a raw-points course if it has many points attached.

Points: Score earned divided by possible points, such as 18 out of 20.
Percent: A ready-made grade value such as 90%, often used when the point maximum is not known.
Weight: The amount of influence an item or category has in the final grade.
Category: A group such as quizzes, homework, labs, essays, or exams that may have its own share of the course.

Grade planning adds a second question: what can still change? A current grade describes counted work. A target average asks what the remaining work must average to reach a goal. That target can become unreachable under one set of assumptions and reachable under another if the course still has enough ungraded weight, extra credit, a curve, or a different category rule.

Course grade flow from entered rows to target planning

Common course grade models and their practical meaning
Course setup	What usually drives the grade	Common mistake
Raw points	Total earned points divided by total possible points.	Assuming every assignment has equal influence even when point values differ.
Weighted categories	Each item or group contributes through its course-share weight.	Treating a category average as final before all category rules are applied.
Letter-only planning	Letter marks are converted to representative percentages before averaging.	Reading the representative value as an official school cutoff.

Drop rules are a frequent source of surprise. A simple lowest-percent drop removes the weakest percentage after penalties. Some learning platforms instead drop the assignment that improves the category total the most, and that may not be the lowest percentage when point values differ. Category-specific drops, never-drop rules, and closed grading periods can also change the official result.

Letter grades add another local rule. One course may call 90% an A-, another may set a different boundary, and an instructor can round final grades in a way that is not visible from individual rows. A grade estimate is most useful when it is treated as a transparent scenario beside the syllabus and the official gradebook, not as a replacement for them.

How to Use This Tool:

Start with the format that matches your grade record, then add course rules only after the rows parse cleanly.

Set Input format. Use Points earned out of max for rows such as Quiz 1, 18, 20, 10, Quizzes, Percent and optional weight for Quiz 1, 90, 10, Quizzes, or Letter grade and optional weight when the record only shows marks such as A-, B+, or PASS.
Paste one line per item in Components. Keep the same column order throughout the run. If a name or category contains a comma, wrap that text in quotes so the columns still split correctly.
Choose Weight interpretation. Use course-share percentages when weights are final-grade shares, normalize entered weights when they are relative values, or ignore weights when the course is a raw-points or simple-average check.
Pick Letter scale when letter input or result bands matter. The plus/minus scale recognizes marks such as A- and B+; the straight-letter scale groups each letter into one representative value.
Open Advanced for scenario assumptions. Target grade sets the goal, Remaining course weight adds unfinished work outside course-share mode, Drop lowest components applies one global drop rule, and Late penalty per component deducts the same percentage from every listed row before aggregation.
Check the summary subtitle and warning rows before trusting the headline. The subtitle shows how many rows were kept and which calculation model is active; warnings flag skipped rows, missing weights, unreachable targets, and ignored remaining-weight settings.
Read Grade Ledger first, then compare Action Plan, the share map, and Target Runway. Use JSON only when you need a structured snapshot of the same inputs and results.

Interpreting Results:

Current Grade is the main percentage after the selected input mode, late penalty, drop count, and weight model have been applied. The letter shown beside it comes from the selected scale. If the kept-row count, calculation model, or warning list looks wrong, fix that issue before reading the rest of the result.

Gap to target shows how far the current grade is from the selected goal. A negative gap means the current scenario is already above the target.
Tracked course weight is the portion of the course represented by the kept rows under the active model.
Remaining course weight is the unfinished share used for target planning. In course-share mode it is inferred from entered weights.
Required avg on remaining work is the remaining-work average needed to reach the target. Values above 100% mean the target is not reachable without extra credit, more remaining weight, a lower target, or a changed assumption.
Max achievable grade assumes the remaining share earns 100%.
Highest-impact category and Weakest kept component point to where lost tracked share is concentrated.

The share map compares available share with earned share. When there are multiple categories, it groups by category. With one category, it switches to component-level bars so the grade loss is still visible. The Action Plan uses warnings, target gap, lost share, late penalty, and weakest counted work to rank next steps.

Do not overread the precision. Four-decimal output can make an estimate look official even when the syllabus has a category-specific drop rule, a different letter cutoff, an unposted grade, or rounding policy that the pasted rows do not include. The safest verification step is to compare the active model and every warning with the official course policy.

Technical Details:

Grade arithmetic first converts each counted item to a percentage. Points rows divide earned points by maximum points. Percent rows already supply the percentage. Letter rows use a representative percentage from the selected letter scale, then follow the same weighting and target equations as the other rows.

A late penalty is applied before the drop rule. This order matters because the penalty changes the effective percent that decides which row is lowest. Dropped rows remain visible in the ledger, but they receive no tracked course share and do not contribute earned share to the current grade.

Formula Core:

The formulas below show the main grade paths. The weighted formula covers course-share and normalized entered weights; the raw-points formula covers unweighted points mode.

\begin{array}{lcl} R_{i} & = & \frac{S_{i}}{M_{i}} \times 100 \\ E_{i} & = & clamp (R_{i} \times (1 - \frac{L}{100}), 0, 200) \\ G_{weighted} & = & \frac{\sum (E_{i} \times W_{i})}{\sum W_{i}} \\ G_{points} & = & \frac{\sum (S_{i} \times (1 - \frac{L}{100}))}{\sum M_{i}} \times 100 \\ A_{needed} & = & \frac{(T - G \times \frac{C}{100}) \times 100}{R} \end{array}

In these equations, S_i is earned score, M_i is maximum points, R_i is row percent, E_i is effective percent after penalty, L is the late-penalty percent, W_i is a kept row's weight, G is current grade, T is target grade, C is tracked course weight, and R is remaining course weight. If no remaining share exists, the required-average formula is not available.

Grade weight interpretation rules
Weight interpretation	How it calculates	Best fit
Auto-detect	Uses course-share weighting when kept weights total 100.5 or less. Uses normalized weighting when they exceed that tolerance.	First pass when pasted weights may be literal percentages or relative values.
Course-share percentages	Reads each valid weight as a share of the final course grade and infers remaining share as 100 minus the kept weight total.	Syllabus weights such as quizzes 10%, homework 20%, and exams 40%.
Normalize entered weights	Rescales valid weights across the tracked portion instead of treating them as literal final-grade shares.	Relative weights such as 1, 2, and 3, or category values that do not sum to a course plan.
Ignore weights	Points mode totals penalized earned points over possible points. Percent and letter modes average kept rows equally.	Unweighted checks or raw-points courses where every point has the same value.

Letter grade mapping used by letter input mode
Letter scale	Representative values	Interpretation note
US plus/minus	A+ = 99, A = 95, A- = 91.5, B+ = 88.5, down through D- = 61.5 and F = 50.	Useful for planning with detailed marks, but local course cutoffs can differ.
Straight letters	A = 95, B = 85, C = 75, D = 65, F = 50.	Ignores plus and minus marks by design.
Pass/fail shortcuts	P or PASS maps to 75. NP or FAIL maps to 50.	A rough planning stand-in, not an official equivalency rule.

Validation and boundary behavior for grade assumptions
Assumption	Accepted range or behavior	Why it matters
Target grade	0% to 200%.	Allows ordinary goals and extra-credit scenarios.
Remaining course weight	0% to 100%; ignored when course-share weights already define the remaining share.	Sets the runway for future-work planning outside course-share mode.
Drop lowest components	Whole numbers from 0 to 8, applied to the lowest effective percentages.	A simple global drop may differ from category-specific or platform drop rules.
Late penalty	0% to 100%, applied to every parsed row before drops and weights.	The penalty can change both the grade and which row is dropped.
Study cadence	1 to 14 days.	Changes action-plan wording only; it does not change grade math.

A weighted example with 90%, 90%, and 82% at weights 10, 20, and 30 gives (90 x 10 + 90 x 20 + 82 x 30) / 60 = 86. If those rows represent 60% of the course and the target is 90%, the remaining 40% must average 96% because the counted work has earned 51.6 final-grade points so far.

Worked Examples:

Mid-course weighted check

Rows of Quiz 1, 18, 20, 10, Quizzes, Homework, 45, 50, 20, Assignments, and Midterm, 82, 100, 30, Exams produce row percentages of 90%, 90%, and 82%. With course-share weighting, Current Grade is 86.00%, Tracked course weight is 60.00%, and a 90% target needs 96.00% on the remaining work.

Unweighted points with a dropped score

Remove the weights from those same rows and set Drop lowest components to 1. The 82% midterm is dropped because it has the lowest effective percent, leaving 63 points earned out of 70 possible. Current Grade becomes 90.00%, but that result would not match a syllabus rule that drops only within a quiz group or uses assignment impact instead of percentage.

Letter-only planning

Rows of Essay, A-, Project, B+, and Midterm, B under the plus/minus scale map to 91.5%, 88.5%, and 85%. The simple average is 88.33%. If Remaining course weight is 25 and the target is 90%, Required avg on remaining work is 95.00%.

Warning cleanup

If weighted mode warns that some kept rows have no weights, the headline grade may exclude visible rows from the weighted average. Fill every counted row with a valid weight or switch Weight interpretation to Ignore weights before relying on Target Runway.

FAQ:

Will this match my learning platform exactly?

Not always. Learning platforms can weight categories, drop scores, round totals, exclude missing work, and apply assignment-group rules in ways that are more specific than a pasted scenario. Match the active assumptions to the syllabus and official gradebook.

Why was one of my lines ignored?

A warning appears when a row does not match the selected Input format or contains an invalid score, maximum, percent, or letter mark. Use the example format shown below Components, and quote names with commas.

Which score is dropped?

The drop setting removes the lowest effective percentages after any global late penalty. It does not imitate category-specific drop rules, never-drop rules, or platforms that choose the dropped item by total-score impact.

What does letter mode calculate?

Letter mode converts each entered mark into a representative percentage using the selected scale, then applies the same weighting and target math as the other modes. Confirm local cutoffs before treating those values as official.

Why is the required average above 100%?

The target is beyond reach under the current assumptions. Lower the target, add more remaining course weight, include valid extra-credit work if the course allows it, or check whether the entered weights match the syllabus.

Does the grade data leave my browser?

The calculation runs in the current browser page with no lookup or upload step for the grade rows. Data is copied to the clipboard or saved as a downloaded file only when you choose those actions.

Glossary:

Effective percent: A row's percentage after the global late penalty is applied and before the drop rule is processed.
Course-share weight: A weight that represents a literal portion of the final course grade.
Normalized weight: A relative weight rescaled across the tracked work instead of read as a final-grade percentage.
Tracked course weight: The portion of the course represented by kept rows under the active model.
Target runway: The set of future-work scenarios showing how remaining averages change the projected final grade.
Representative percentage: The numeric value used as a planning stand-in for an entered letter mark.

References:

Weighted Grades, Lehman College Center for Teaching and Learning.
Explanation of Grades, University of Illinois Office of the Registrar.
How do I create rules for an assignment group?, Instructure Community.