Grade Calculator

What is a grade?

In education, a grade is a numeric or letter-based summary of performance on assignments, exams, or entire courses. Common formats include:

• Percentages (for example, 86.7%)
• Letter grades (A, B, C, D, F)
• GPA-style scales (0.0–4.0)

The calculator on this page focuses on numeric course grades: turning raw scores or category averages into a single percent and letter grade.

Points-based grade formula

If your course uses points (each assignment has a number of points possible and a number of points you earned), your overall grade is:

For example, imagine you have:

• Test 1: 40 / 50
• Test 2: 45 / 50
• Homework: 90 / 100

Then you earned \(40 + 45 + 90 = 175\) points out of \(50 + 50 + 100 = 200\) possible, so your grade is \[ \frac{175}{200} \times 100 = 87.5\%. \]

Weighted-grade formula

Many syllabi use weighted categories, such as:

• Homework: 20% of the final grade
• Quizzes: 30% of the final grade
• Exams: 50% of the final grade

If each category has its own average percentage, the overall grade is the weighted average:

The weighted tab of the calculator implements this formula and checks that you have provided sensible weights.

Letter grades and 4.0 scale

Institutions use different scales, but a common A–F mapping is:

• A: 90–100%
• B: 80–89%
• C: 70–79%
• D: 60–69%
• F: below 60%

The calculator applies this conventional mapping and also shows a 4.0-style approximation:

• A → 4.0
• B → 3.0
• C → 2.0
• D → 1.0
• F → 0.0

Always verify the exact rules in your syllabus, as some courses use plus/minus grading or slightly different cutoffs.

“GRADE” in clinical evidence vs. numeric grades

Outside education, the word GRADE often refers to a structured framework for rating the certainty of evidence and recommendations in evidence-based medicine. That framework involves qualitative judgments, study design, risk-of-bias assessment, and explicit criteria—not a simple numeric calculator.

This page does not implement the clinical GRADE methodology. It is a numeric grade calculator for course results. For clinical GRADE workflows, you should rely on specialized guidelines and tools used in evidence synthesis and guideline development.

Grade calculator – FAQ

How precise are the percentages?

Internally, the tool uses double-precision floating-point arithmetic. Percentages are displayed to two decimal places by default, which is more precise than most reported course grades. Minor rounding differences (for example, 89.999% vs. 90.0%) should be resolved according to your institution’s rounding policy.

What if my weights don’t sum to 100%?

The calculator normalizes weights by dividing by the sum of all weights you enter. This means you can use weights like 2, 3, 5 instead of 20%, 30%, 50%. However, if some categories are missing from your model, your result will differ from the official grade.

Can I model “what-if” scenarios?

Yes. A common workflow is to enter your current scores, then adjust the grade of a future exam row to see how different outcomes would affect your final grade. This is especially helpful when planning how much effort to invest in remaining assessments.

Does this calculator work for pass/fail or non-standard grading systems?

It can be adapted as long as your system can be expressed in percentages and category weights. For purely qualitative or competency-based assessments, the underlying logic may not map directly to numeric averages, so treat the results as approximate.