How do I convert my grade (in percentage) to 4.0 scale?

<p>Recently, I've been looking at threads where people post their stats and what schools they got into. How do they calculate their 4.0 gpa? My school only gives me a grade out of 100%, so I have no idea what my gpa is out of a 4.0. I've looked at many conversion scales online, such as the college board scale:
A+ (97-100) = 4.0
A (93-96) = 4.0
A- (90-92) = 3.7</p>

<p>B+ (87-89) = 3.3
B (83-86) = 3.0
B- (80-82) = 2.7</p>

<p>C+ (77-79) = 2.3
C (73-76) = 2.0
C- (70-72) = 1.7</p>

<p>D+ (67-69) = 1.3
D (65-66) = 1.0
E/F (below 65) = 0.0
but I always see people post that they have 3.9 gpa or 3.8 gpa and that's not part of the collegeboard scale.</p>

<p>Here’s one: [GPA</a> Conversion Chart](<a href=“http://inquiry.princetonreview.com/leadgentemplate/GPA_popup.asp]GPA”>Calculate Your GPA With Our GPA Scale | The Princeton Review)</p>

<p>I can’t remember, but I -think- that this is how it goes:</p>

<p>Convert the grade for every class you’ve taken to a point value, then multiply each point value by the credit value of the class. Add it all up. Divide by the total amount of credits you’ve taken. A 3.8 or 3.9 is a mix of As and A-s.</p>

<p>To do this accurately you need to do it course by course and assign each course a A, B, or whatever and then figure out your GPA. Someone could have a 93% average made up of course grades 97, 97, 89, 89 (A,A,B,B 3.5 GPA) … or course grades 93, 93, 93, 93 (A,A,A,A 4.0 GPA) … (in a system with only A,B,C,D and F as possible grades to keep it simple). I’d suggest asking your GC if your school has a conversation scale.</p>