The number of credits depends on the course period, the exact number is different for each course. You can find the exact number of credits on the course page. Those are ECTS credits, guaranteed by Utrecht University or HU University of Applied Sciences.
It is up to your own university, however, to accept the credits in the context of your study. If you want to be sure on that, please contact your own study advisor. He or she can always contact our course leaders, in order to learn more about the content and the level of the course. The course leader will provide an official certificate on successful completion of the course.