Study & writing
Study hours calculator
Enter the credits you are taking and the study ratio your college expects; get the out-of-class hours per week, per day and for the whole term.
Use 3 hours per credit for lab-heavy, math or engineering courses and for any course you find difficult.
The credit-hour rule behind the numbers
In the US system one semester credit hour stands for one hour of class a week plus a minimum of two hours of work outside class, over a term of about 15 weeks. That definition is written into federal regulation (34 CFR 600.2), which is why most colleges quote the same two-to-one ratio. Many advisors suggest three hours per credit for demanding subjects. The calculator multiplies your credits by the ratio to get weekly self-study, divides by six study days to leave one day free, and multiplies by the number of weeks for the term total. Class time is counted as one hour per credit.
Example: a 15-credit load at 2 hours per credit means 30 hours of study a week, or 5 hours on each of six days. Across a 15-week semester that is 450 hours. Add 15 hours in lectures and seminars and the full academic workload is 45 hours a week.
| Credits | Study/week at 2 h | Study/week at 3 h | Class + study at 2 h | Class + study at 3 h |
|---|---|---|---|---|
| 6 | 12 h | 18 h | 18 h | 24 h |
| 9 | 18 h | 27 h | 27 h | 36 h |
| 12 | 24 h | 36 h | 36 h | 48 h |
| 15 | 30 h | 45 h | 45 h | 60 h |
| 18 | 36 h | 54 h | 54 h | 72 h |
Reading your result
Twelve credits is usually the minimum for full-time status, and at the standard ratio it already adds up to 36 hours a week, close to a full-time job. Fifteen credits, the load needed to graduate a 120-credit degree in four years, lands at 45 hours. If you plan to work more than 10 to 15 hours a week on top of that, the totals show quickly whether a lighter course load is the realistic choice.
The ratio is a planning guide, not a measurement. Introductory courses in a subject you already know may need less; a first course in organic chemistry or calculus often needs more than three hours per credit in the weeks before exams. Study time is also uneven across the term: the first weeks are lighter, while midterms and finals concentrate the work. A practical approach is to block the weekly figure in your calendar from week one, so that the hours exist when the reading piles up, and to check after a month whether your grades suggest you need more or less.
Quarter-system schools use a different credit size: about 10 weeks per term and roughly two-thirds of a semester credit. Enter 10 or 11 weeks and your quarter credits to get comparable numbers.
Frequently asked questions
How many hours should I study per credit hour?
The common standard is 2 hours outside class for every credit hour each week, and 3 hours for difficult or technical courses. A 3-credit course therefore needs about 6 to 9 hours of study a week.
How many hours a week is 15 credits?
About 45 hours: 15 hours in class and 30 hours of self-study at the 2-to-1 ratio. At 3 hours per credit the total rises to 60 hours a week.
Can I work a job while taking 12 credits?
Many students do. Twelve credits come to roughly 36 hours of class and study a week, so a 10 to 20 hour job brings the total to about 46 to 56 hours. Plan your study blocks first and fit shifts around them.