Pinnacle Grade Calculator is a free Chrome extension developed by William Chiang & Salvador Aleguas. It falls under the category of Browsers and is specifically listed under the subcategory of Add-ons & Tools.

This extension is designed to help you determine how a new assignment or grade will affect your overall class grade. It simplifies the process by automatically updating your class average based on the new grade. Whether your class uses a point system or not, you can add fake grades and instantly see the impact on your average. The extension even takes into account different categories.

Please note that while the Pinnacle Grade Calculator strives for accuracy, it is not liable for any damages that may result from its use. Calculations may not be one hundred percent accurate. The latest update, version 1.0.4, has fixed any functionality issues that were previously reported.