Grade Curve Calculator
Grade Curve Calculator is a free web-based tool from gradingbellcurve.com for adjusting raw exam or test scores using several common curving algorithms. It provides a bulk paste table editor for entering student names and scores, then calculates curved scores, boosts, letter grades, and class statistics. The homepage describes it as an interactive grade curving tool with dynamic distribution algorithms. The calculator supports a flat points shift, linear scaling from the top raw score to 100%, the Texas curve using 10 × √Raw Score, target mean scaling, numerical bell curve normalization to a target mean and standard deviation, and letter-grade bell curve forced distribution brackets. After entering scores and selecting settings, users can review class mean, median, standard deviation, min/max, pass rate, and a comparison table of raw versus curved scores. Results can be copied or exported as CSV. It is part of a larger free academic calculator suite that includes grade, GPA, high school GPA, EZ Grader, final grade, z-score, and standard deviation calculators. The tool is browser-based, requires no installation, and appears aimed at teachers, professors, tutors, and academic administrators who need quick what-if scenarios for grading on a curve.
- Category
- Online Learning
- Pricing
- Unknown
Problem solved
Teachers and instructors often receive exam scores lower than expected and need a transparent way to adjust them without manual spreadsheet work. This tool automates common curve formulas, shows the resulting distribution statistics, and produces exportable curved score tables so educators can compare raw and adjusted grades.
Use cases
- Curve a class set of exam scores by adding a flat point shift
- Scale scores so the highest raw score becomes 100%
- Apply the Texas square-root curve to boost lower scores
- Normalize a class average to a chosen target mean
- Force letter grades into bell curve percentile brackets
- Paste bulk student scores and export curved results as CSV
- Calculate class mean, median, standard deviation, and pass rate after curving
- Compare raw versus curved scores and letter grades in one table
Audience
- Enterprise
- Researchers
- Hobbyists
Pros
- Free and browser-based, with no installation needed
- Supports multiple curve types, including flat shift, linear scale, Texas curve, target mean, and bell curve
- Bulk paste and CSV export streamline classroom-sized grade lists
- Automatically computes class statistics and letter grades after curving
- Part of a broader free academic calculator suite
Cons
- No public API, GitHub repository, or LMS integration is described
- Requires entering student score data into a third-party web form if using online
- Curve models are simplified and may not match institution-specific grading policies
- No account system or saved class histories mentioned
- Exact license, update cadence, and source code are not provided
Official website: https://gradingbellcurve.com/
Canonical LambdaBase page: https://www.lambdabase.com/tools/grade-curve-calculator