Grade Curve Calculator
See what a set of test scores would look like after applying a curve. Compare flat-point, curve-to-target, and square-root curving methods by switching between them.
Grade Curve Calculator
Whether and how to curve grades is entirely up to the instructor. This tool is only for exploring “what if” scenarios — it does not predict an actual grade.
| Label | Original Score | Curved Score | Point Boost |
|---|---|---|---|
| Score 1 | — | — | — |
Each valid score from 0 to 100 has equal weight. Blank or invalid rows are excluded. Calculations retain precision; displayed scores and boosts are rounded to one decimal, and averages to two.
Current Formula
New Score = Old Score + (100 − Highest Score)
Adds enough points to every score so the highest score in the set becomes 100.
Curve Methods
Highest Score
How to Use
- Enter each score you want to curve, with an optional label
- Use the + Add Score button to add more rows, or remove ones you don't need
- Choose a curve method: Flat Points, Curve to Target, or Square Root
- For the flat method, set how many points to add to every score
- Review the results table and the before/after average of valid entered scores
Important Notes
- Whether and how to curve grades is entirely up to the instructor — this tool is only for exploring what-if scenarios
- All curved scores are capped at 100, even if the formula would push them higher
- The curve-to-target method adds enough points to bring the highest score up to 100
- The square-root method uses scores expressed as percentages from 0 to 100; calculations retain decimals until display
- Results here are not a prediction of an actual grade — always confirm with your instructor's official policy
Related Calculators
Keep exploring
Browse all guides →
A curve changes a score by a stated rule.
A flat adjustment of 5 points turns 70 into 75. A proportional adjustment and a target-mean shift are different operations.
The condition that changes the answer.
Inspect the chosen method and how it handles the score ceiling. A curve is a course policy, not a universal entitlement.
Read the method guides ↗Make the result useful.
Compare the original and adjusted distributions before drawing conclusions.