SAT Score Calculator
Total SAT and percentile.
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Grade Curve Calculator
Apply a flat, square-root or linear curve to a raw exam score.
Curved score
—
After the curve.
| Letter grade | — |
|---|---|
| Points added | — |
| Raw score | — |
| Method | — |
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Enter your figures above to see the step-by-step working.
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How the Grade Curve Calculator Works
Curving adjusts raw exam scores upward to account for a hard test. This calculator supports the three most common curves: a flat curve that adds the same points to everyone so the class high becomes 100; a square-root curve (curved = √score × 10) that helps lower scores most; and a linear curve that scales every score up so the top mark becomes 100%.
Enter your raw percentage and the highest score in the class, choose a method, and it shows your curved score, the points gained and the resulting letter grade.
flat: score + (100 − class high) · sqrt: √score × 10 · linear: score × 100 / high
Frequently Asked Questions
What is a grade curve?
An adjustment that raises raw scores — usually because a test was harder than intended — so grades better reflect relative performance.
How does a square-root curve work?
Your curved score is the square root of your percentage times ten, so a 64 becomes an 80. It boosts lower scores the most.
What is a flat curve?
The difference between 100 and the class’s highest score is added to everyone, so the top student gets 100 and all others rise by the same amount.
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