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<p>Actually, a typical course load at Berkeley is 4 courses per semester, since most courses are 4 units, some are 3 units, and relatively few are other unit values like 0.5 (PE activities), 1, 2, 5, or 6. The “normal” load is 15 units per semester; 120 units are required to graduate.</p>
<p>At some semester schools, or in some majors, it is more common for courses to be 3 units, so the “normal” load of 15 units would usually need 5 courses per semester.</p>
<p>This appears similar to quarter system schools. A quarter unit is 2/3 of a semester unit, and an N quarter unit course theoretically has 2/3 the material as an N semester unit course. E.g. freshman calculus is usually two semesters or three quarters of 4 unit courses (i.e. 8 semester units or 12 quarter units). Same material, same class time, just divided differently.</p>