Unlike most GPA converters that support one or two scales, this one covers ten, 4.0 through 20.0, including India's 10.0 and France's 20.0. It's fully bidirectional: convert GPA to percentage or percentage back to GPA in one tool. Every result shows the exact formula used, so nothing is a black box. A live comparison table shows your result across every other scale simultaneously. Free, no sign-up, and built to fix formula inconsistencies I found in other popular calculators.