Google Classroom Grade Calculator is a free chrome extension for Google Classroom that allows teachers to add a grade calculation to the app.

Students can access the extension from the main menu of the app. Teachers need to enable the extension in their device for it to work.

When the extension is enabled, teachers can press the "View your work." button to see all of the assignments that were assigned in the class.

After the assignment is viewed, teachers can press the "Get Grades" button to get grades for the entire class. By default, the grade is calculated using the total point system. Teachers can add in a weighted system for calculating grades if they wish to do so. If a section is left blank, it will not be factored into your grade.