How the highest-score curve works
The most common simple curve sets the highest score in the class to 100% and gives everyone the same boost. The bonus is 100 minus the top score, added to each raw score (capped at 100). It rewards the whole class without changing the ranking.
How to use this calculator
Enter your raw score and the highest score in the class, both as percentages. The result shows your curved grade and the size of the curve. Want to see the underlying percentage first? Use the grade percentage calculator. The curved percentage maps to a letter in the letter grade calculator.
Other ways teachers curve
Some instructors use a flat bonus (add a fixed number of points), a square-root curve (new = √raw × 10), or a bell curve that fits grades to a distribution. This tool models the straightforward top-score method, which is the easiest to predict. Class-wide effects are easier to see with the grade average calculator.
Frequently asked questions
- How does a grade curve work?
- A common method adds the difference between the highest score and 100 to every score, so the top mark becomes 100% and everyone rises equally.
- How much will a curve raise my grade?
- By 100 minus the class's highest score. If the top score was 92, everyone gets 8 points added.
- Does a curve change class rank?
- A flat top-score curve adds the same amount to everyone, so the order of scores stays the same.
- What is a square-root curve?
- It replaces each score with its square root times 10, which helps lower scores more than high ones. This calculator uses the top-score method instead.
- Can a curve lower my grade?
- Not with this method. The bonus is never negative while the class high is under 100, so scores can only rise or stay the same. Curves that force grades into a fixed distribution can push some scores down, but this tool does not model those.