Calculate your overall grade from assignment scores and their weightings.
Overall % = Σ(score% × weight%) ÷ Σ(weight%). Enter matching comma-separated lists of scores and weights.
When a syllabus lists category weights — say, Tests 40%, Homework 30%, Quizzes 20%, Participation 10% — the single most common error students make is simply adding up their average in each category and dividing by the number of categories, as if all categories counted equally. That's not what the weights mean: if you're averaging 90% in homework but homework is only worth 20% of the final grade, that 90% contributes 18 points toward your total (90 × 0.20), not 90 points and not an equal one-fourth share alongside every other category, regardless of how many categories there are.
The correct method calculates your average within each category first, multiplies each category average by its assigned weight, and adds those weighted contributions together — with the weights themselves summing to 1.0 (or 100%), never averaged against each other. A second, subtler mistake trips up students checking their grade mid-semester: if only some categories have graded work so far (say, Tests and Quizzes are done, but Homework and Participation haven't started), your "grade so far" needs to be divided by the weight of what's actually been graded, not by 100% — otherwise the calculation understates your current standing by treating not-yet-completed categories as if you'd already lost those points. Getting this distinction right matters most when you're trying to calculate what you need on a remaining exam or assignment to hit a target final grade, since an error in the weighting method compounds directly into a wrong target score.
Averaging category averages together as if every category counted equally — for example, adding your Tests, Homework and Quiz averages and dividing by 3, which ignores that Tests might be worth 40% of the grade while Quizzes are only worth 20%. Categories must be multiplied by their actual assigned weight, not treated as equal shares.
Calculate your average score within each category first, multiply each category average by its assigned weight (expressed as a decimal, e.g. 40% = 0.40), then add all the weighted contributions together. The category weights should sum to 1.0 (or 100%) across the whole syllabus — never averaged against each other.
Because your current grade-so-far needs to be divided by the total weight of categories that have actually been graded, not by 100%. Dividing by the full 100% before all categories have grades effectively treats the ungraded portions as zero, which understates your real current standing.
Because an error in how you weight existing grades directly changes the target score you calculate needing on the remaining assessment. If your current weighted average is miscalculated (even by a few points, from an averaging mistake), the "score needed on the final" figure built on top of that error will also be wrong — sometimes by a meaningful margin.