| Grade | Definition | Points | Dates Used | 
| A | Outstanding | 4.0 | 1958-present | 
| A- |  | 3.7 | 1987-present | 
| B+ |  | 3.3 | 1987-present | 
| B | Very Good | 3.0 | 1958-present | 
| B- |  | 2.7 | 1987-present | 
| C+ |  | 2.3 | 1987-present | 
| C | Average | 2.0 | 1958-present | 
| C- |  | 1.7 | 1987-present | 
| D+ |  | 1.3 | 1987-present | 
| D | Barely Passing | 1.0 | 1958-present | 
| D- |  | 0.7 | 1987-present | 
| F | Failure | 0.0 | 1958-present | 
| CR | Credit | 0.0 | 1967-present | 
| NC | No Credit | 0.0 | 1973-present | 
| U | Unauthorized Incomplete | 0.0 | 1977-2002 | 
| AU | Audit | 0.0 | 1958-1987 | 
| RP | Report in Progress | 0.0 | 2008-present | 
| SP | Satisfactory Progress | 0.0 | 1973-2008 | 
| I | Incomplete | 0.0 | 1958-present | 
| IC | Incomplete Charged | 0.0 | 2008-present | 
| W | Withdrawal | 0.0 | 1958-present | 
| WU | Unauthorized Withdrawal | 0.0 | 1958-1973, 2002-present |