Grade Curve Calculator
Paste a list of grades, pick a curve method, and see every score before and after — along with how the class average changes.
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Curve method
Curved grades are capped at 100.
How Each Curve Method Works
- Flat boost — adds the same points to every grade (capped at 100). The average rises by the boost amount, but the gaps between students stay the same except at the cap.
- Square-root curve — each grade becomes 10 × √grade. It helps low scores the most: a 49 becomes a 70, a 64 becomes an 80, while a 100 stays a 100. The class compresses toward the top of the scale.
- Scale highest to 100 — every grade is multiplied by 100 ÷ highest score. Relative standing is preserved exactly; everyone rises by the same percentage rather than the same points.
Frequently Asked Questions
- What is a square-root curve?
- A square-root curve replaces each grade with 10 times the square root of the original score, so a 49 becomes a 70 and an 81 becomes a 90. It lifts low scores the most while leaving a 100 unchanged, which compresses the class toward the top of the scale.
- How does a flat boost curve work?
- A flat boost adds the same number of points to every grade, capped at 100. It shifts the class average up by the boost amount but keeps the gaps between students the same, except where scores hit the 100 cap.
- What does scaling the highest score to 100 do?
- Every grade is multiplied by 100 divided by the highest score in the list. If the top score was 92, all grades are multiplied by 100/92, so the best student gets 100 and everyone else rises proportionally.
- Which curve method helps low scores the most?
- The square-root curve. It adds the most points at the bottom of the scale — a 25 gains 25 points while a 90 gains under 5 — so it narrows the gap between struggling and strong students more than a flat boost or proportional scaling.
- How do I enter my class's grades?
- Paste or type the numeric grades into the box, one per line or separated by commas. The calculator ignores blank entries and anything that is not a number, then shows every grade before and after the curve.