Carnegie Hours in College Courses

How contact time, out-of-class work, and credit hours relate under the Carnegie Unit standard

Published

February 11, 2026

Reference Guide · Higher Education
The Carnegie Credit Hour Formula
1 credit hour = 1 hour of instruction + 2 hours of out-of-class work per week × 15 weeks = 45 total student-engagement hours per credit
Source: U.S. Department of Education & Carnegie Foundation for the Advancement of Teaching · 50-minute class periods count as one contact hour
Course / Format Credits Contact Hrs/Wk Outside Work Hrs/Wk Total Hrs/Wk Total Hrs (15-wk term)
Standard Lecturee.g., Psy 320, Eng 101 3 3 6 9 135
Lecture + Labe.g., Biology, Chemistry 4 3 lec + 3 lab 6 12 180
Lab / Studio Only1 credit = 3 hrs lab/wk 1 3 0–1 3 45
Online / AsynchronousSame total hours, no set meeting time 3 3 (equiv.) 6 9 135
Accelerated (7-week)Doubled weekly load 3 6 12 18 126
Internship / PracticumPer federal guidelines 1 40–45 hrs total 40–45

Term Length Equivalencies

Semester (15 wks) · 1 credit 45 hrs
Quarter (10 wks) · 1 credit ~33 hrs
7-week accelerated · 1 credit 42 hrs
4-week summer · 1 credit ~45 hrs
One 50-min class = contact hrs 1 hr

Contact Hours by Activity Type

1 hr lecture → outside prep 2 hrs
1 hr lab → outside prep 0–1 hr
1 hr seminar / discussion 2 hrs
1 hr studio (art, music) 1–2 hrs
Independent study / tutorial 15 hrs/credit

Sources: Carnegie Foundation for the Advancement of Teaching · U.S. Department of Education Credit Hour Definition (34 CFR §600.2) · SUNY Credit/Contact Hour Policy · Wikipedia: Carnegie Unit and Student Hour