Slovenia inherited the academic grading system of the Socialist Federal Republic of Yugoslavia. A five-point grading scale is used in primary and secondary schools:

• 5: excellent (odlično, best possible grade; usually 90%+)
• 4: very good (prav dobro, usually 80%+)
• 3: good (dobro, usually 65%+)
• 2: sufficient (zadostno, lowest passing grade; usually 50%+)
• 1: insufficient (nezadostno, lowest possible grade; failing)

Many teachers use minus and plus symbols as grade modifiers. For example, "−5" denotes a grade slightly lower than "excellent", while "+4" denotes a grade slightly higher than "very good". Half-grades such as "4/5" are also used. However, these modifiers are unofficial and do not appear in final grade reports.

In universities, a six-level grading scale is used:

• 10 – excellent (best possible grade)
• 9 – very good
• 8 – very good
• 7 – good
• 6 – sufficient (lowest passing grade)
• 5 or less (failing grades)