Skip to content
Utilboxes

Grade Calculator

Turn marks into a percentage and a letter grade. Combine weighted assessments, or work out what the final exam needs to be.

Runs entirely in your browser

How to use the Grade Calculator

  1. 1Add each assessment with the marks you scored, the marks available, and its weight in the course.
  2. 2The overall percentage and letter grade update as you type.
  3. 3Use the final exam planner to find the score you need for a target grade.
  4. 4Switch grading scales if your institution uses different boundaries.

How it works

Each assessment is converted to its own percentage, multiplied by its weight, and the weighted results are added together. If the weights you enter do not add up to 100%, the tool normalises them — so entering four assessments weighted 1 each treats them as equal quarters.

The final exam planner rearranges that sum. It takes the weight you have already banked, the target overall percentage, and solves for the score needed on the remaining assessment. When the required score is above 100% it says so plainly, rather than showing an impossible number without comment.

Letter grades come from the boundary table for the scale you select. Boundaries vary between institutions, so treat the letter as indicative and the percentage as the reliable figure.

The formula

overall % = Σ ((score ÷ maximum) × weight) ÷ Σ weight × 100
score
marks you achieved on an assessment
maximum
marks available for that assessment
weight
how much that assessment counts toward the course

Weights are normalised, so they do not have to add up to exactly 100.

Worked example

A course with coursework, a midterm and a final

  1. Coursework: 42/50, weight 20 → 84% × 0.20
  2. Midterm: 61/80, weight 30 → 76.25% × 0.30
  3. Final: 70/100, weight 50 → 70% × 0.50

Result: 16.8 + 22.9 + 35.0 = 74.7% overall, which is a C on a standard scale.

Frequently asked questions

What do I need on the final to pass?
Enter your completed assessments, set the target percentage, and the planner solves for the final score required. It tells you clearly if the target cannot be reached.
Do my weights have to add up to 100?
No. They are normalised, so weights of 1, 1, 2 are treated as 25%, 25% and 50%.
Why is my letter grade different from my school's?
Grade boundaries are set by each institution and differ widely. Pick the closest scale, or read the percentage and apply your own boundaries.

Related tools

GPA CalculatorAdd your courses and credits to get a weighted grade point average.CGPA CalculatorCombine several semesters into one cumulative grade average.Percentage CalculatorWork out percentages, increases, decreases and 'what percent of'.Attendance CalculatorSee your attendance percentage and how many classes you still need.