These free grade calculators cover a single test, a whole course and a curved score. Each one shows its formula and worked examples, so you can check any result by hand.
Created by Dennis Norton · Updated November 1, 2026
Choose a grade calculator
Test Grade Calculator
Turn the points you earned, or the questions you missed, into a percentage and a letter grade. Pick plus and minus grades or letters only, and open a table that lists every possible score on the same test.
Weighted Grade Calculator
Combine assignments, quizzes and exams that count for different amounts. It separates the average of the work you have finished from the points that work has earned toward the whole course, and it treats a blank grade as not graded, not as zero.
Grade Curve Calculator
See what a curve does to one score. Compare a square-root curve, added percentage points and scaling the highest class score to 100%, with the increase shown for each.
Which calculator should I use?
- You have one test result and want the percentage or letter: use the test grade calculator.
- Your course combines several graded parts with different weights: use the weighted grade calculator.
- Your instructor adjusted the scores and you want to see the effect: use the grade curve calculator.
Grading scales and curve rules differ between schools and instructors. Check your syllabus before relying on a result.