Grade scaling (or "curving") adjusts raw exam scores to account for test difficulty, ensuring that the grade distribution reflects actual learning achievement rather than the exam's inherent difficulty. For example, if the highest score in the class was 74/100 on a difficult exam, scaling might map that to an A, with all other scores proportionally adjusted.

InfraHub's Smart Grade Scaler supports three international grading systems: the US letter grade scale (A–F), the French 0–20 scale, and the German 1–6 scale.

The scaler supports several curve methods: linear scaling (multiplies all scores by a constant factor), square root scaling (applies √score × 10 to compress the range), and custom boundary mapping (you specify what raw score maps to each grade boundary). The tool displays the full distribution before and after scaling in a visual histogram, so you can see how the curve affects the class as a whole before committing to it.

University professors adjust grades after a harder-than-expected midterm or final exam. International schools convert grades between European and American systems for student transfers. Language institutes translate test scores to CEFR level equivalents. Certification program instructors establish passing thresholds based on cohort performance rather than fixed absolute scores.