That is what I go by, there is about 4g carbs per cup (for whole, non fruit added plain yoghurt) based on the theory that the good bacteria feed off the sugars....

From a search on the topic "yoghurt" I came up with these many posts http://forum.lowcarber.org/search.php?searchid=37766 have a read through some of these, there is a tonne of info on yoghurt & carb values on this site....

hth

Fiona