A good number in Spain is 6 million euros. With the today's dollar-euro exchange ratio (1.34), that's equivalent to 8 million dollar. I think the mark of 6 million euros (8 million dollar) in Spain is equivalent to 100 million in US. For instance, in 2010, in US there were 30 movies with 100 million dollar or more and in Spain there were 29 movies with 8 million dollar or more. In 2009, 32 in US and 30 in Spain with the same limits. In 2008, 29 in US and 33 in Spain. They are very similar numbers of movies.Of course there are exceptions. Avatar grossed 78 million euros in Spain (110 million dollar). That would be equivalent to 1.3 billion in US. But in general it's very accurate. The next one in the ranking is Titanic with 38 million euros (44 million dollar with the 1998 dollar-peseta ratio). That would be 630 million dollar in US (very similar to second highest movie in US that is Titanic too). And ROTK, with nearly 33 million euros (39 million dollar with the 2003 dollar-euro ratio), would be equivalent to 545 million dollar in US (very similar to the third movie gross, The Dark Knight, which grossed 533)