How much a book weighs is based on how big it is. A typical paperback novel is about 6 inches wide and 9 inches tall. If the book is 300 pages long, that means it weighs about 15.6 ounces on average.
Hardcover books weigh more than paperback books of the same size. On average, a book with 460 pages weighs about 1 pound and 2 ounces, while a book with 735 pages weighs about 1 pound and 15 ounces.
Textbooks, on the other hand, are bigger and heavier than books. A 500-page hardcover book is about 2 pounds and 10 ounces and is 7 inches by 10 inches. A book with 1000 pages weighs about 5 pounds and 3.1 ounces.