College Credit Hours Calculator
Turn weekly lecture and lab hours into credits and workload.
What it does
College credits translate weekly class time into a standard load. One common Carnegie pattern counts one lecture hour plus about two homework hours per week as a credit, with two to three lab hours counting as a credit. Schools tune the lab divisor by program.
The tool above takes lecture hours, lab hours, and term weeks and returns credits, homework per week, and total contact hours. The defaults 3 lecture with 2 lab over 15 weeks match the worked example, so the page opens showing 4 credits.
Credits here use lecture plus lab over 2. Homework uses lecture times 2 per week. Total contact multiplies weekly class (lecture plus lab) by weeks. A 3 plus 2 load over 15 weeks gives 4 credits, 6 homework hours weekly, and 75 contact hours.
Rules vary. Some labs use divisor 3, studios and clinics use other ratios, and accelerated terms compress the same contact into fewer weeks. Always confirm with the catalog and registrar, since aid and full time status follow official credits, not this estimate.
This page shows the formula, one full hand checked example at 3 plus 2 over 15, a reference table, and practice checks that run through the tool.
How to use
- Type lecture hours per week.
- Type lab hours per week.
- Pick term weeks: 15, 10, 8, or 5.
- Read Credit hours as lecture plus half lab.
- Read Homework as lecture times 2 weekly.
- Read Total contact as weekly class times weeks.
Formula
- lecture
- Lecture hours per week.
- lab
- Lab hours per week, half weight here.
- weeks
- Term length in weeks.
Lab divisor 2 suits many programs here. Where catalog uses 3 for labs, divide lab by 3 instead. Verify divisor with the school before reporting aid credits.
Worked example
Example: 3 lecture, 2 lab, 15 weeks
A science course meets 3 lecture with 2 lab over 15 weeks.
- Credits: 3 + 2/2 = 3 + 1 = 4 credits.
- Homework: 3 x 2 = 6 h/week.
- Weekly class: 3 + 2 = 5 h.
- Contact: 5 x 15 = 75 h.
- Check: 75 contact with 90 homework hours over term.
- Report 4 credits subject to catalog divisor.
Reference table
| Lecture + lab | Credits | Homework/week |
|---|---|---|
| 3 + 0 | 3 credits | 6 h/week |
| 3 + 2 | 4 credits | 6 h/week |
| 4 + 0 | 4 credits | 8 h/week |
| 2 + 6 | 5 credits | 4 h/week |
Limits
- Estimate with lab divisor 2. Catalogs vary.
- No studio, clinic, or co-op ratios here.
- Homework 2x is a planning rule, not a transcript rule.
- Aid status follows official credits, not this tool.
Common mistakes
- Counting lab 1 to 1 with lecture for all programs.
- Forgetting homework when planning weekly load.
- Multiplying credits by weeks to get contact. Use weekly class times weeks.
- Using 15 weeks for a 10 week quarter.
- Reporting estimate as official registrar credits.
Try it yourself
Quick checks. Answers sit tucked under each question.
4 lecture, 0 lab, 15 weeks?
4 credits, 8 h/week homework, 60 h contact.
2 lecture, 6 lab, 10 weeks?
5 credits, 4 h/week homework, 80 h contact.
Questions
How are credits figured here?
Lecture plus half lab.
3 plus 2?
4 credits.
Homework?
About lecture times 2 weekly for planning.
Total contact?
Weekly class times weeks. Here 75 h.
Lab divisor always 2?
No. Many use 2, some use 3. Check catalog.
Official?
No. Registrar and catalog control aid and status.