Enter either the clock hours (60-minute hours) or credit hours into the calculator to determine the missing value. Because credit-hour policies vary by institution and program, you can adjust the assumptions used for the conversion.
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Clock Hours to Credit Hours Formula
The conversion between clock hours and credit hours depends on the policy used (semester vs quarter system, lecture vs lab, and institutional/program rules). A common semester-based approximation is built from contact time assumptions:
CH = \frac{60H}{N \cdot m}Variables:
- CH is the credit hours
- H is the clock hours (60-minute hours of instruction)
- N is the number of contact hours per credit hour (often 15 in many semester-based systems)
- m is the minutes per contact hour (often 50 minutes)
If you use the common assumptions N = 15 and m = 50, then 1 credit hour corresponds to about 15 × 50 = 750 minutes of in-class time, which is 750 ÷ 60 = 12.5 clock hours. In that case, a rule-of-thumb is:
CH = \frac{H}{12.5}| Clock Hours | Credit Hours |
|---|---|
| 15 | 1.20 |
| 30 | 2.40 |
| 45 | 3.60 |
| 60 | 4.80 |
| 75 | 6.00 |
| 90 | 7.20 |
| 105 | 8.40 |
| 120 | 9.60 |
| 135 | 10.80 |
| 150 | 12.00 |
| 165 | 13.20 |
| 180 | 14.40 |
| 210 | 16.80 |
| 225 | 18.00 |
| 240 | 19.20 |
| 270 | 21.60 |
| 300 | 24.00 |
| 360 | 28.80 |
| 450 | 36.00 |
| 600 | 48.00 |
| Conversion shown uses: Credit Hours = Clock Hours ÷ 12.5 (based on the example assumptions above). Use your institution’s policy if different. | |
What are Clock Hours and Credit Hours?
Clock hours are literal 60-minute hours of instruction/training time. Credit hours are an academic measure of course value/workload; in many semester-based systems, 1 credit hour is often associated with roughly one contact hour per week (often defined as a 50-minute class period) over about 15 weeks, plus additional out-of-class student work. Exact definitions and conversions can vary by institution, accreditation, and (for vocational/clock-hour programs) by jurisdiction and program type.
How to Calculate Clock Hours to Credit Hours?
The following steps outline how to estimate the conversion from clock hours to credit hours using contact-time assumptions.
- Determine the total number of clock hours of instruction (H), where 1 clock hour = 60 minutes.
- Choose assumptions (or use your institution’s policy): contact hours per credit (N) and minutes per contact hour (m).
- Compute effective clock-hours-per-credit: Clock-Hours per Credit = (N × m) ÷ 60.
- Compute credit hours: CH = H ÷ (Clock-Hours per Credit).
- Optionally verify your result using the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge (using common semester assumptions N = 15 contact hours per credit and m = 50 minutes per contact hour).
Total clock hours (H) = 45
First compute clock-hours-per-credit = (15 × 50) ÷ 60 = 12.5. Then CH = 45 ÷ 12.5 = 3.6 credit hours.