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Grade Curve Calculator
Curve a set of test scores in seconds. Paste your scores, choose a curve method — flat to the top score, a square-root curve, or add fixed points — and see every curved grade plus the new class average.
Curve method
Original average
69.4%
Curved average
79.4%
| Original | Curved | Grade |
|---|---|---|
| 62% | 72% | C- |
| 71% | 81% | B- |
| 55% | 65% | D |
| 84% | 94% | A |
| 48% | 58% | F |
| 77% | 87% | B+ |
| 90% | 100% | A+ |
| 68% | 78% | C+ |
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Grade Curve Calculator — FAQ
How does the flat curve work?
It finds the highest score, raises it to 100, and adds that same number of points to everyone — a common way to curve a hard test.
What is a square-root curve?
Each score is replaced by its square root times ten (√score × 10). It boosts lower scores more than high ones, gently pulling the class average up.
Is the grade curve calculator free?
Yes — it runs in your browser, needs no account, and is completely free.
