The 2-to-3 hour rule
Universities widely cite the Carnegie Unit rule: each credit hour means about 1 hour in class + 2 hours of study per week. A 15-credit load is therefore roughly 15 class hours + 30–45 study hours = a 45–60 hour week. That's a full-time job — by design.
Reading your results
The calculator gives three numbers: study hours per week (credits × rate), total academic hours (class + study), and a load check against your free hours. If total academic hours exceed ~60% of your free time, the term is heavy — plan for it or trim a course.
Example: 15 credits at 2.5 hr/credit = 37.5 study hours + 15 class hours = 52.5 academic hours. With 60 free hours a week, that's an 88% commitment — weekends included.
Making it realistic
- Block, don't browse: split study into 2–3 hour blocks with real breaks; distributed practice beats marathon sessions.
- Front-load hard courses: give STEM and writing-heavy classes their full 3 hr/credit even if others get 2.
- Protect one rest day: a schedule with zero recovery collapses by week 6.
- Adjust the per-credit rate to your major — engineering and pre-med students should use 3.