Grade Calculator

What this calculator does

The Grade Calculator computes a weighted average for a course. You list each assignment, test, project, or exam with its grade and its percentage weight. The calculator converts every grade to a percentage, multiplies it by the weight, adds the results, and divides by the total weight entered.

The same engine can work backward. In the Required Final Grade mode, enter your current grade, the grade you want, and the percentage of the course that the final is worth. The calculator returns the score you need on the final. This is useful when the syllabus gives weights but leaves the final exam percentage open.

How to use this calculator

1. Choose Weighted Course Grade or Required Final Grade.
2. For a weighted grade, enter one item per line as name, grade, weight %. Grades may be numbers or letters.
3. Click Calculate to see the weighted average, the equivalent letter grade, and the GPA equivalent.
4. For a final-grade target, enter the current grade, target grade, and final weight.

The default weighted example uses Homework 1 at 90 with a 5% weight, Project at B with a 20% weight, and Midterm exam at 88 with a 20% weight. The entered weights total 45%, so the calculator normalizes by 45 rather than assuming the missing 55% is zero. The weighted percentage is about 86.7%, and the weighted GPA equivalent is 3.211, which rounds to 3.21 (B+).

Grade formulas

Weighted average = Σ(grade percentage × weight) / Σ(weight)
GPA equivalent   = Σ(grade points × weight) / Σ(weight)
Required final   = (target − current × (1 − final weight)) / final weight

Letter grades are converted to percentages using the midpoint of their band. For example, B is treated as 84.5% and B+ as 88%. Grade points follow the standard 4.3 scale used by the GPA Calculator.

What the results mean

The headline shows the average percentage and the letter grade it falls into. The GPA equivalent is a weighted average of grade points, and the letter in parentheses is the closest letter on the 4.3 scale; this is not a separate course GPA. Total weight tells you how much of the course is represented by the items you entered. Remaining weight is the portion not yet accounted for.

For the final-grade mode, a required score above 100% means the target is not reachable with the current grade and final weight. A negative required score means the target is already secured.

Assumptions and limitations

• Weights are percentages, not points. A weight of 20 means 20% of the course grade.
• The calculator normalizes by the weights entered. If you enter only the graded portion of a course, the result describes that portion.
• Letter grades use fixed midpoint percentages. A school may use a different conversion.
• Extra credit, dropped scores, curved exams, and rounding rules are not modeled.
• The GPA equivalent is a convenience comparison, not an official transcript value.
• Course and assignment names may not contain commas.

Frequently asked questions

What if my weights add up to less than 100%?

The calculator divides by the total weight you entered. If the graded items total 45%, the average is calculated over those 45% and the remaining 55% is shown as unweighted. This lets you track an in-progress course.

Can I use letter grades and percentages together?

Yes. Each item is converted independently. Percentages stay as entered, while letters use the midpoint of their percentage band. The weighted average combines both.

How do I find the score I need on the final?

Use Required Final Grade. Enter your current course grade, the grade you want overall, and the final exam weight. The result is the percentage you need on the final. If it is above 100%, the target is out of reach under the current weights.

Reference tables

Weighted grade example

Grade formats

Letter grade reference

Letter-grade cutoffs vary by school. This table is a common US college scale, not a universal rule.

Source

Reference: Calculator.net — Grade Calculator.

Disclaimer

This calculator provides an estimate for planning. Your instructor's syllabus, grading policy, and official gradebook control the final course grade.