How many US semester credits is an ECTS credit worth?
ECTS credits are based on total work load, not just “contact hours”, which are the basis for most US semester credits. A “standard credit load” for one semester in ECTS units is 30, while a typical load in US semester credit hours is about 15 (or a bit more). Therefore, a conversion of 2 ECTS credits = 1 US semester credit is reasonable, on average. Due to different schemes of detailed accounting, this may not be quite right for any particular course, but is pretty close on average.