Grade Curve Calculator

Paste a list of numeric scores, or a mini gradebook with one Name, score pair per line (header row optional).

Named rows keep student names in the results table and CSV export.

• Add flat points: same bump for everyone.
• Add so best = 100: raise everyone until the top score hits 100 (gaps stay the same).
• Multiply so best = 100: scale every score by the same factor (gaps grow).
• Square-root: √score × 10 — lifts low scores most; 100 stays 100.
• Shift to target mean: add or subtract so the class mean matches your target.
• Bell curve: force a chosen mean and SD (can lower top scores).
• Compare: run every method on the same scores.

How many points to add to every score when using Add flat points.

Example: amount 5 turns 72 into 77.

Desired class average after the curve. Used by Shift to target mean, Bell curve, and the Compare view.

How spread out scores should be after a bell curve.

Smaller SD packs grades tighter around the target mean; larger SD spreads them out.

When Yes, any curved score above 100 is clipped to 100.

Turn off only if you allow scores over 100 after scaling or bell curving.

When Yes, each curved score also gets a letter (A–F) from your cutoffs.

Hidden in Compare mode, which focuses on side-by-side method stats.

Minimum curved score for each letter, highest first.

Example: A:90, B:80, C:70, D:60, F:0 means 89.9 is a B.