Grade calculators help students track their standing in a course throughout a term. This tool computes weighted averages (where a final exam counts more than a quiz), converts the percentage to a letter grade using a configurable grading scale, and can reverse-calculate what score you need on the final exam to achieve a target overall grade.
In an unweighted system, all assessments contribute equally to the final grade. In a weighted system, different components carry different importance: e.g. homework 20%, midterm 30%, final exam 50%. The weighted grade is the sum of (component percentage × component weight). Getting 90% on homework and 60% on the final gives: (0.90 × 0.20) + (0.60 × 0.50) + other components, not a simple average of 90 and 60.
Multiply each component's percentage grade by its weight (as a decimal), then sum. Example: 85% × 0.20 (homework weight) + 72% × 0.30 (midterm) + 78% × 0.50 (final) = 17 + 21.6 + 39 = 77.6%.
Enter all completed components, set the minimum grade to B (80%), and set the final exam's weight. The calculator solves for the required final exam score: Required = (Target% − (Sum of completed component scores × weights)) ÷ remaining weight.
This depends on the institution's scale. A common US scale: A+ ≥ 97%, A ≥ 93%, A− ≥ 90%, B+ ≥ 87%, B ≥ 83%, B− ≥ 80%, C+ ≥ 77%... The grading scale is configurable in the tool.
Common 4.0 scale: A = 4.0, A− = 3.7, B+ = 3.3, B = 3.0, B− = 2.7, C+ = 2.3, C = 2.0, D = 1.0, F = 0. The exact mapping varies by institution.
See also the Average Calculator, Percentage Calculator, and the BMI Calculator.