Quick Definition
Credit hours (or credits) are the unit of academic workload at universities, typically representing 1 hour of lecture per week per semester. A standard US bachelor's degree requires 120 credit hours; a master's program: 30–36 credit hours. Credit hours determine full-time vs part-time status.
Credit Hours — Full Explanation
F-1 students must maintain full-time enrollment: typically 12+ credit hours per semester for undergrad, 9+ for grad. One credit hour = ~3 hours of total work per week (lecture + homework). Course transferability is assessed by comparing credit hours and course content.
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