Grade Conversion Calculators: Free Scale & System Change Tools

Convert grades between any scoring systems with our free online grade conversion calculators. Whether you need to translate a percentage into a letter grade, convert a 4.0 GPA to a percentage equivalent, map a 100-point scale to a 5-point scale, or create a custom conversion table for your institution, these tools deliver accurate results instantly. Enter your grade in any format—percentage, letter, GPA points, fraction, or ratio—to receive equivalent values across all standard and custom scales. Each calculator includes plus/minus letter variations, decimal GPA precision, rounding rule options, and batch conversion support for entire class rosters. Teachers, students, administrators, and transcript evaluators use these tools to eliminate manual conversion errors and ensure consistent grading across different courses, departments, or institutions. No signup required—access from any device and convert grades with confidence.