Many classes have a final exam that accounts for a very significant percentage of your final grade in the class. To find the score you need to get on the final to pass, you need to know the percent of your grade the final comprises, your current grade in the class and the lowest passing grade. Knowing the final grade necessary to pass the class can motivate you to study harder, especially if you know that you need a very high score.

Divide the percentage of your grade your final is worth by 100. For example, if your final is 40 percent of your grade, divide 40 by 100 to get 0.4.

Subtract the Step 1 result from 1 to find the portion of your grade comprised of your other assignments. In this example, subtract 0.4 from 1 to get 0.6.

Multiply your current grade in the class by the portion of your grade comprised of other assignments. For this example, if your current grade is a 75, multiply 75 by 0.6 to get 45.

Subtract the Step 3 result from the passing grade for your class. In this example, if 70 is the lowest passing grade, subtract 45 from 70 to get 25.

Divide the Step 4 result by the percentage of your grade your final makes up to find the grade you need on your final to pass. Finishing the example, divide 25 by 40 to get 0.625, meaning you need a 62.5 percent on your final to pass.