A student's final percentage mark for any credit-bearing course is calculated using a strict provincial formula designed to reflect both consistent term performance and overall culminating comprehension.
70% Term Evaluation: Seventy percent of the grade is based on evaluations conducted throughout the course. This portion reflects the student's most consistent level of achievement, with special consideration given to more recent evidence of performance.
30% Final Evaluation: Thirty percent of the grade is based on a final evaluation administered at or towards the end of the course. This culminating assessment allows the student to demonstrate comprehensive achievement of the overall expectations. It may take the form of a proctored digital exam, a culminating performance task, a portfolio, or a combination of these methods.
All grading is based on the provincial Achievement Chart, which standardizes how teachers assess student work across four specific categories of knowledge and skills. Every major assessment is graded based on a balance of these four areas:
Knowledge and Understanding: Subject-specific content acquired in each course (knowledge), and the comprehension of its meaning and significance (understanding).
Thinking: The use of critical and creative thinking skills and processes (such as planning, processing, and problem-solving).
Communication: The conveying of meaning through various forms (oral, written, and visual) tailored to the intended audience and purpose.
Application: The use of knowledge and skills to make connections within and between various contexts (such as real-world applications and cross-disciplinary transfers).
When assigning grades, teachers evaluate student evidence against the provincial standards. The table below outlines how the Ministry defines each Level of Achievement and translates it into a final percentage mark for Grades 9 to 12.
| Provincial Level | Percentage Range | Ministry Definition of Achievement | Credit Status |
| Level 4 | 80% to 100% | The student has demonstrated the required knowledge and skills with a high degree of effectiveness. Achievement surpasses the provincial standard. | Credit Granted |
| Level 3 | 70% to 79% | The student has demonstrated the required knowledge and skills with considerable effectiveness. Achievement meets the provincial standard. | Credit Granted |
| Level 2 | 60% to 69% | The student has demonstrated the required knowledge and skills with some effectiveness. Achievement approaches the provincial standard. | Credit Granted |
| Level 1 | 50% to 59% | The student has demonstrated the required knowledge and skills with limited effectiveness. Achievement falls much below the provincial standard. | Credit Granted |
| Below Level 1 | 0% to 49% | The student has not demonstrated the required knowledge and skills. Extensive remediation is required. | Credit Not Granted |
In specific circumstances, percentage marks may be replaced or accompanied by standardized administrative codes on official school records.
The "I" Indicator (Grades 9 and 10 Only): The code "I" may be used on a report card to indicate that insufficient evidence is available to determine a percentage mark. This is typically applied when a student has missed significant instructional time or failed to submit mandatory culminating assessments.
The "W" Indicator (Grades 11 and 12 Only): Under the Ministry's Full Disclosure policy, if a student withdraws from a Grade 11 or 12 course more than five instructional days after the issuance of the mid-term report card, a "W" is entered in the credit column of the Ontario Student Transcript, and the percentage grade at the time of withdrawal is permanently recorded.
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