Grade Curve Calculator
A Grade Curve Calculator helps you estimate how a curved grading policy changes a raw score into a curved percentage, a letter grade, and (optionally) a GPA. Whether your instructor adds points, scales the top score to 100, or uses a distribution method, this tool makes the curve easy to understand.
Common Curve Methods Explained (with Simple Formulas)
Add Points Curve
Adds a fixed number to every raw score.
Formula: Curved = Raw + b
Increase Percent Curve
Increases scores by a percentage factor.
Formula: Curved = Raw × (1 + p/100)
Scale to Max (Highest → 100)
Scales scores so the highest score becomes 100.
Formula: Curved = Raw × (100 / Highest)
Linear Curve to Target Mean
Adjusts scores so the class mean shifts to a target mean while respecting the highest score.
Idea: Builds a line: Curved = a×Raw + b
Z-Score Curve
Uses class mean and standard deviation to re-map scores into a new distribution.
Idea: Converts raw scores into z-scores, then applies a target distribution.
If you want to prevent unrealistic results, enable Clamp 0–100 so curved results stay within 0–100%.
Explore More Tools on Grade Calculator Tools
Your curved score is only one part of your academic picture. You can also calculate your overall course grade, semester performance, or GPA using our other calculators:
- Grade Calculator (weighted categories, points/percent/letter)
- GPA Calculator (semester and cumulative)