How many avatars are there on earth?

Like realistically how many do you think there are. I did some math and assuming every domain is similar in size to the merry go round spacially (0.25 miles squared), and that 50% have an avatar and are only located on land, i got that there are one hundred fifteen million twenty thousand avatars, which seemed like way too many, so how many do you think there are realistically. (Yes I know measurements don't work at all after the change, but thats the closest I could do to any numbers)