Grade Curve Calculator

The Grade Curve Calculator allows you to calculate the approximate grading scale for a standard grade curve, helping in professional assessment.

Enter the total test population, the highest score, and the lowest score to calculate the grade curve.

A Normal Bell Curve calculates grades based on student results, using standard deviations from the mean average.

Please note that a small test population with minimal score variation won’t produce an effective Bell Curve.

In a true Bell Curve grading method, a test population of 100 students is divided into 5 categories: 2 students get an “A”, 14 get a “B”, 68 get a “C”, 14 get a “D”, and 2 get an “F”.

Grade curve calculator

You might be interested in calculating the percentile rank, finding the class width, or determining the class rank.


  • Calsamiglia, C., & Loviglio, A. (2019). Grading on a curve: When having good peers is not good. Economics of Education Review, 73, 101916.
  • Grade Statistics, or All About the Curve. (n.d.). Grade Statistics, or All About the Curve.
  • How Does Grading on a Curve Work? | BestColleges. (n.d.).
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