What is a good depth for a bookcase?

An ideal bookcase depth is usually between 10 and 12 inches. Shelf spacing can range from 7 to 15 inches for bookshelves, with 8 to 12 inches being the most typical. Because compact bookcases are designed for lesser volumes and libraries, they will be shallower. A small bookcase's depth is usually around 6 inches. On 1stDibs, find a wide variety of antique and vintage bookcases.