There are a couple of different ways to calculate weighted totals in Blackboard. The following examples will help explain the differences between them.

To Calculate the Weighted Total by Item/Column:

Weighted by Column/Item | Points Possible | Points Earned by Student | Percentage |
---|---|---|---|

Homework 1 | A 25 | w 24 | pA 10% |

Homework 2 | B 20 | x 20 | pB 15% |

Paper | C 50 | y 45 | pC 35% |

Final | D 100 | z 92 | pD 40% |

Total Possible Points | 195 | 181 | 100% |

Letters were added to these cells to help show the equation. The equation used to calculate weighted total by column/item:

=((w/A) * pA) + ((x/B) * pB) + ((y/C) * pC) + ((z/D) * pD)

=((24/25) * .1) + ((20/.20) * .15) + ((45/50) * .35) + ((92/100) * .4)

= .096 + .15 + .315 + .368

= .929 or 92.9%

To Calculate the Weighted Total by Category:

Weighted by Category | Points Possible | Points Earned by Student | Percentage by Category |
---|---|---|---|

Homework 1 | 10 | 10 | Homework 15% |

Homework 2 | 10 | 8 | |

Homework 3 | 10 | 10 | |

Quiz 1 | 25 | 23 | Quizzes 20% |

Quiz 2 | 25 | 24 | |

Test 1 | 50 | 44 | Tests 25% |

Test 2 | 50 | 47 | |

Discussion Board 1 | 15 | 15 | Discussion Boards 10% |

Discussion Board 2 | 15 | 15 | |

Final | 200 | 173 | Final 30% |

Total | 410 | 369 | 100% |

For each category, that percentage is being spread out across all the items in that category. Most courses are held in a manner of a running total so Blackboard will only calculate a grade for a submission or columns that have a grade entered. In this example, we are assuming all assignments have been turned in.

Category | Equation | Percentage Earned |
---|---|---|

Homework | ((10/10) * .05 + ((8/10) * .05) + ((10/10) * .05) | .05 + .04 + .05 = .14% |

Quizzes | ((23/25) * .1) + ((24/25) * .1) | .092 + .096 = .188% |

Tests | ((44/50) * .125) + ((47/50) * .125) | .11 + .1175 = .2275% |

Discussion Boards | ((15/15) * .05) + ((15/15) * .05 | .05 + .05 = .1% |

Final | (173/200) * .3 | .2595% |

Total Weigted Grade | .14+.188+.2275+.1+.2595+.915 | 91.5% |

Due to the weights in the categories, the weighted total is a little higher than it would have been if the grade was calculated solely on the total number of points accumulated.

Total Points - 369/400 = 90%

Weighted Total = 91.5%