Grade Curve Calculator
Curve test scores with linear rescaling, ratio scaling, Bell curve, or square root methods.
What Is Grade Curving?
Grade curving adjusts raw test scores to relative performance. Teachers use it when a difficult exam produces low averages or when the top score should map to 100 percent.
Curve Methods
- Linear rescaling: Adds the same points to every score so the highest becomes 100.
- Ratio scaling: Multiplies all scores by a constant factor.
- Bell curve: Maps scores to a normal distribution with a target mean and standard deviation.
- Square root: Boosts lower scores more than higher scores.
Track individual course performance with the Grade Calculator or Final Grade Calculator.
Frequently Asked Questions
What does grading on a curve mean?
It converts absolute scores into relative scores based on class performance, often so the top score equals 100 percent.
How does linear rescaling work?
Find the highest score, compute the gap to 100, and add that gap to every student score.
When should I use a Bell curve?
Use it when you want most grades clustered around a target average with controlled spread.
Does curving change score rankings?
Linear and ratio methods preserve rank order. Bell curve and square root methods can change relative spacing.
Can curved scores exceed 100?
This tool clamps final curved scores between 0 and 100 for practical grading use.
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