I calculated the word count (words per line for 10 lines divided by 10 times the number of lines per page times the number of pages, rounding the product) for Dan Brown's Origin (231,000 words), Robert Ludlum's The Prometheus Deception (210,000), Daniel Silva's The Black Widow (180,000), Brad Thor's Code of Conduct (166,000), Michael Connelly's The Crossing (129,000), and Vince Flynn's Enemy of the State (147,000).
Then I used the other method to count words on a manuscript (250 words times the number of pages, but I substituted 500 since the above books are single spaced). I got 230,000, 255,000, 264,000, 180,000, 194,000, 194,000 respectively.
Obviously formatting of the books is different than the manuscript counting method (250 times number of pages, modified here to 500 times number of pages for single spaced books).
I cannot explain the huge difference between what agents/editors claim are "usual" novel word counts and what I see in the market as I have presented here. Every book I selected off my shelf exceeds the so-called maximum of 110,000 words for commercial literature or 90,000 words per thriller novel.
Even Dan Brown's first novel Digital Fortress is 159,000 words and 186,000 respectively using each method. That's 49,000 words or more too much for a first novel according to nearly everything I read on here. Then there is the actual word count by MS Word which I'm advised it not used by agents and editors.