About Grade Analyzer

Analyze grade distribution with statistics: mean, median, variance, and trends. Part of the DevTools Surf developer suite. Browse more tools in the Calculators collection.

Use Cases

• Calculate class average, median, and standard deviation from a set of exam scores.
• Identify the grade cutoff points that affect the most students for potential curve adjustments.
• Generate a grade distribution histogram for a semester report.
• Compute weighted final grades from multiple assignment categories with different weights.

Tips

• Paste raw grade data as a comma-separated list or one per line — the analyzer auto-detects both formats.
• Use the weighted average mode to account for assignments, midterms, and finals with different point values.
• Check the distribution chart to see if grades cluster near grade boundaries, which may indicate scaling decisions.

Fun Facts

• Letter grades were introduced by Mount Holyoke College in 1897 — making them over 125 years old. The A-F grading system used in the US is not universal; many countries use numeric 1-10 or 1-100 scales.
• The average GPA at Harvard College was 3.80 in 2023, up from 2.70 in the 1960s — a phenomenon called grade inflation documented across US universities since the 1980s.
• Standard deviation in grade distributions was first applied to academic grading by Thorndike in 1910 as a way to compare performance across different class sizes and test difficulty levels.

FAQ

Does it support weighted grades?

Yes — assign a weight (percentage of final grade) to each category (homework, midterm, final) and input the average score per category. The tool computes the weighted mean.

What statistics does it report?

Mean, median, mode, standard deviation, variance, min, max, range, and letter-grade distribution across standard A/B/C/D/F cutoffs (configurable).

Can I adjust the grading scale?

Yes — the default is 90/80/70/60 for A/B/C/D. You can set custom cutoffs or use a plus/minus scale (A+/A/A-) with corresponding GPA point values.