Grading System in Thailand

Most Common

Grade	Grade Description	US Grade
A	Excellent	A
A-	Very Good	A-
B+	Very Good	B+
B	Good	B
B-		B-
C+	Fairly Good	C+
C	Fair	C
C-		C-
D+	Poor	D+
D	Very Poor	D
F	Failure	F
AU	Audit	-
WF	Withdrawal because of Failure	-

4-point

Secondary School

Grade	Scale	Grade Description	US Grade
4	75,000 - 100,000	Excellent	A
3.5			AB
3	65,000 - 74,000	Superior	B
2.5			BC
2	55,000 - 64,000	Satisfactory	C
1.5			CD
1	50,000 - 54,000	Pass	D
F	0,000 - 49,000	Fail	F

International Baccalaureate Diploma

Scale	US Grade
6,000 - 7,000	A
5,000 - 5,990	B
4,000 - 4,990	C
3,000 - 3,990	D
1,000 - 2,990	F
0,000 - 0,990	F

Letter Grade (4 point)

Asian Institute of Technology

Chulalongkorn University

King Mongkut's University of Technology

Mahidol University

Grade	US Grade
A	A
B+	AB
B	B
C+	BC
C	C
D+	CD
D	D
P	S
F	F