Grade Distribution Calculator: Full Guide (2025)
Use our grade distribution calculator to analyze class performance with mean, median, mode, and bell curve.
Key Statistics
| Statistic | Formula | Example |
|---|---|---|
| Mean | Σx / n | 85.6 |
| Median | Middle value | 88 |
| Mode | Most frequent | 85 |
| Std Dev | √(Σ(x-μ)²/n) | 6.2 |
Bell Curve Example
- 68% within 1 SD
- 95% within 2 SD
- 99.7% within 3 SD
Step-by-Step Guide
- Enter grades: Comma/space separated
- Optional curve: Set target mean
- Get stats + histogram
Why Analyze Distribution?
- Identify outliers
- Curve grades fairly
- Improve teaching
FAQ
How to curve to B average?
Set mean to 80–82. Add points to all.
What is a good standard deviation?
8–12 for fair spread.
Can I use letter grades?
Convert first using Letter to GPA
Pro Tips
- Remove outliers first
- Use with Grade Curve
- Export histogram
Conclusion
Understand your class. Use our grade distribution calculator now!
Related: Grade Curve | GPA Calculator