Originally Posted by
MoreMilesPlease
In the US the cost is usually per room and not per person. In other parts of the world that may not be the case, as in the UK.
This always used to be the case, but is rarely so now. A couple of booking sites do still use it, as does the kind of B&B or guesthouse that caters to the kind of person who feigns ignorance of metric measurements, is constantly making jokes about "Health and Safety", and, every time they say "Happy Christmas", follow it up with "if I'm still allowed to say that!"
Different rates for single and double occupancy are common, though, particularly when breakfast is included. But you'll almost always be quoted for the room rate.