Flat Bump Grade Curve Calculator

Enter the original grade, the flat bump, the minimum floor, and the maximum allowed grade. The calculator adds the bump, compares that result with the floor, chooses the higher value, and caps it at the maximum. It also identifies which rule determined the result, making the calculation easy to explain, reproduce, and audit for one student or an automated grade-processing workflow.

Enter the grading policy as four separate values

Start with the raw grade exactly as it appears before this curve is applied. Then enter the flat bump amount, which is the same number of grade points offered to every grade processed under the policy. The minimum floor is the lowest result that the policy guarantees, while the maximum grade is the highest result it permits. Keeping these values separate prevents a common source of confusion: a five-point bump and a floor of seventy are not interchangeable rules. A raw grade of sixty receives the bump first, but the resulting sixty-five is still below the floor, so the floor controls. A raw grade of eighty receives the same bump and normally remains above the floor, so the flat bump controls. All four inputs must be finite, nonnegative numbers. The raw grade and floor cannot exceed the stated maximum because those combinations describe a contradictory grading scale rather than a curve that can be applied consistently. Decimal values are accepted when the course records fractional points or percentages.

Follow the order of operations in the result

The calculation follows a fixed sequence. First, it adds the bump amount to the raw grade and reports that intermediate value as the bumped grade. Second, it compares the bumped grade with the minimum floor and keeps whichever is higher. Third, it compares that chosen value with the maximum grade and caps the result when necessary. In compact form, the final grade is the minimum of the maximum grade and the greater of the bumped grade or floor. The response reports the final curved grade, the total increase from the raw grade, and an applied rule label. A minimum_floor label means the ordinary bump did not reach the guaranteed floor. A flat_bump label means the bumped value was valid without help from either boundary. A maximum_cap label means the bump would have crossed the allowed ceiling. This ordering matters: capping before applying the floor could create a result above the maximum when the floor is misconfigured, while adding the bump after applying the floor would grant a larger increase than the stated policy promises.

Use the calculation consistently and document its limits

For an individual check, compare the returned raw grade, intermediate bumped grade, and final curved grade with the written course policy. For batch work, send one request per grade and retain the applied rule alongside the final value; that makes it possible to distinguish students helped by the floor from those receiving only the ordinary bump. Identical inputs always return identical outputs because the calculation uses no network access, random choice, or current time. The tool does not decide whether a curve is fair, authorized, or compatible with an institution's grading rules. It also does not convert letter grades, weight assignments, round to a school-specific number of decimal places, or modify a gradebook. Those decisions should be settled before using the result. If another policy says to add the bump only below a threshold, preserve relative rankings, or rescale an entire class distribution, this calculator is not the appropriate model. Use it only when every included grade is governed by the same flat bump, minimum floor, and maximum. API automation is available for $0.002 per request.