Help Me Calculate my HS GPA? Please :)

<p>All the posts I've seen on chance me have over 4.0 GPA's and I'm not entirely sure how it's possible. I'm an honor roll student: all A's & B's except for a D once in one class freshman year and whenever I try and figure out my GPA it's around 3.0-3.5</p>

<p>If anyone can take the time to help me out with calculating it I'd really appreciate it!
Here are my grades (letter-wise)</p>

<p>Freshman Year:
Accel English 9 (1 credit): A-
Cultural Geography (1 credit): B+
Accel Geometry (1 credit): D
Wellness (0.5 credit): A
Accel Biology (1 credit): B
Spanish II (1 credit): A-
Fitness (0.5 credit): A</p>

<p>Sophmore Year
English 10 (1 credit): A
Writing (0.5 credit): B
Economics (0.5 credit): B+
Civics (0.5 credit): B+
Accel Algebra 2 (1 credit): B
Chemistry (1 credit): A
Spanish III (1 credit): B+
Fundamentals of Art (0.5 credit): B
Physical Education (0.5 credit): A</p>

<p>Junior Year
Pre-Calculus (1 credit): A-
Physics (1 credit): B+
AP English Language (1 credit): A-
AP US History (1 credit): B-
Anatomy & Physiology (1 credit): B-
Foods & Nutrition 1 (0.5 credit): A</p>

<p>there's 22 courses listed. I'm just at a loss when I try to calculate my GPA, it always comes out differently :/</p>

<p>It really depends on your school’s scale (A = 4.00, A- = 3.67, etc…), but it’s a 3.33 at most schools.</p>

<p>I’m getting a 3.148333</p>

<p>A = 4 A- = 3.67 B+ = 3.33 B = 3… so on…</p>

<p>Whenever there’s a .5, divide by two. So if you got a B in a class that was .5 credits, say it’s a 1.5. </p>

<p>Add all the numbers together.</p>

<p>Divide by 18 (the total number of credits).</p>