Rubric Score Calculator
A grading rubric scores work across several criteria, often with different weights and different point maximums. Combining them into one fair total means converting each criterion to a fraction of its own maximum, weighting it, and dividing by the total weight. This calculator handles up to four weighted criteria, each with its own earned points and possible points, and returns the overall percentage along with total points earned out of total possible. Weights need not sum to 100; only their relative sizes matter. The math is exact, so the same inputs always produce the same grade.
Weighted rubric formula
criterion fraction = earned / possible
weighted sum = sum of (fraction * weight)
overall percent = weighted sum / total weight * 100
total points = sum of earned, out of sum of possible
Each criterion is converted to a fraction of its own maximum before weighting, so criteria with different point scales combine correctly. Criteria with zero weight or zero maximum are skipped.
Notes
- Weights are relative; they do not need to add up to 100.
- Use the points-out-of-possible figure when a rubric is graded on raw points, not percentages.
- Set a criterion's weight to zero to drop it from the total.
- Apply your course grading scale to the percentage for a letter grade.
- Document the weights on the rubric so the calculation is transparent to students.
Rubric scoring: frequently asked questions
How is a weighted rubric score calculated?
For each criterion, divide the points earned by the points possible to get a fraction, multiply by the criterion's weight, and sum across criteria. Dividing the weighted sum by the total weight gives the overall percentage. This calculator handles up to four criteria with their own weights.
Do the weights have to add up to 100?
No. The calculator divides by the sum of the weights you enter, so any consistent set works, whether the weights total 100, 10, or anything else. Relative size is what matters. If three criteria carry weights of 2, 1, and 1, the first counts for half.
What if a criterion has a different maximum?
That is fine. Enter each criterion's earned points and its own maximum. The calculator converts each to a fraction before weighting, so criteria scored out of 4, out of 10, and out of 100 combine correctly.
How do I leave a criterion out?
Set its weight to zero, or leave its points possible at zero, and it is excluded from the total. The calculator ignores criteria with no weight or no maximum so partial rubrics still compute cleanly.
Does this convert to a letter grade?
It returns an overall percentage and total points. To get a letter grade, apply your course's grading scale to the percentage, since cutoffs vary by institution. Pair this with a grading-scale converter for that step.
Official sources
- National Center for Education Statistics: NCES (assessment context).
- U.S. Department of Education: official site.
Reviewed by the CalculatorHub team, edited by James Graham, 17 June 2026. The weighted-average formula is standard arithmetic. See our methodology.