How your grade will be calculated in the new letter-grade system:

Students in courses offered by the History Department will normally receive letter grades in seminars and a combination of letter grades and numeric grades in lectures. Instructors will announce which assignments, if any, will be graded numerically.   A chart of grade descriptors has been prepared to help you understand your grade.
Grade Descriptors Chart

For the purposes of calculating your course average, letter grades on individual assignments will be translated temporarily into numerical values using the Faculty of Arts and Science approved scale.
Arts & Science Letter Grade Input Scheme Table

Your course average will be converted to a final letter grade according to Queen's Official Grade Conversion Scale
Queen's Official Grade Conversion Scale 

Only the final letter grade will appear on your transcript and be used to calculate your GPA.