Amazon.com, Barnes and Noble, The Wall Street Journal, USA Today and The New York Times feature lists of the latest bestsellers. Companies use intricate algorithms based on sales numbers to determine the list of bestsellers.
The New York Times produces 20 weekly and three monthly lists of bestsellers. It gives non fiction books the least amount of space, and excludes eBook sales for less popular non fiction. Results are tabulated Sunday to Sunday, and the list depends on publishers providing The New York Times with copies of the books to track. It derives results from surveys of secretive accounts polled weekly for sales.
USA Today and The Wall Street Journal rely solely on Nielsen Bookscan reporting, which does not exclude any particular type of book. Unlike The Times, USA Today's list combines all genres of books together without any attempt to separate or filter results. Similar to The Times, it gathers results from polled sales outlets.
The "Amazon Monthly 100" list from Amazon.com is calculated on an hourly basis, while its traditional Amazon top 100 list is configured monthly. Calculating it on a monthly basis helps eliminate artificial number inflation based on an author purchasing a large amount of her own books or one-week-wonders.
As of October 2015, some of the top books across the different lists include "The Sword of Summer" by Rick Riordan, "The Martian" by Andy Weir and "Color Me Calm" by Lacy Mucklow.