What is the Add Points curving method?

Every raw score receives a flat addition of the specified number of points. For example, adding 5 points turns a 72 into a 77. Scores are capped at 100 after the addition.

How does the square root curve work?

Each raw score is divided by 100, the square root is taken, then the result is multiplied by 100. The formula is: curved = sqrt(raw / 100) × 100. A raw 64 becomes sqrt(0.64) × 100 = 80. This method benefits lower scores more than higher ones.

What does "Scale to Highest Score" mean?

The highest raw score in the class is mapped to the target maximum (typically 100), and all other scores are scaled proportionally. Formula: curved = (raw / highest) × target. If the highest raw score is 85 and the target is 100, a student who scored 68 gets 68/85 × 100 ≈ 80.

Can scores exceed 100 after curving?

The Add Points method caps adjusted scores at 100 by default. The Square Root and Scale to Highest Score methods are mathematically bounded at the target maximum, so no score exceeds 100 unless you set a target above 100 in the Scale method.

How are letter grades assigned?

The default scale is A ≥ 90, B ≥ 80, C ≥ 70, D ≥ 60, F below 60. You can adjust each cutoff in the Grade Scale panel.

Is my data stored or sent anywhere?

No. All calculations happen entirely in your browser. No scores or results are transmitted to any server.

Curve Grade Calculator

Name: Curve Grade Calculator
Availability: InStock
Author: Nham Vu

Enter raw exam scores, choose a curving method, and instantly see adjusted scores and letter grades side by side.

Raw Scores

Curving Method

Points to Add

Scores (0–100) 0 entered

Enter scores and click Calculate to see curved results

Raw Average

Curved Average

Grade Distribution

Grade	Raw Count	Curved Count	Change

Score Breakdown

#	Raw Score	Raw Grade	Curved Score	Curved Grade

Grade Scale

Minimum % for each letter

Summary

Enter raw exam scores, choose a curving method, and instantly see adjusted scores and letter grades side by side.

How it works

Enter each student's raw score (0–100) in the score list, one per row.
Choose a curving method: Add Points, Square Root Curve, or Scale to Highest Score.
For "Add Points," type the number of points to add to every score.
For "Scale to Highest Score," enter the target maximum (default 100); scores are scaled so the highest raw score maps to that target.
Click Calculate to see every score's adjusted value and the letter grade before and after curving.
The summary bar shows the class average and grade distribution for both raw and curved scores.

Use cases

Instructors curving a midterm or final exam to raise the class average.
Students estimating their curved grade before official results are posted.
Comparing different curving methods side by side to pick the fairest approach.
Verifying that a curved score set produces the desired grade distribution.
Quick sanity-check when your instructor announces a curve but not the exact method.
Converting square-root-curved scores to letter grades for a 100-point scale.

Frequently Asked Questions

Last updated: 2026-07-01 · Reviewed by Nham Vu