How many floors or decks does Genesis specify for Noah's Ark?

Genesis specifies three decks for Noah's Ark.

Genesis 6:16 instructs Noah to make the Ark with a lower, second, and third deck. These three levels are listed alongside the Ark's window and door, providing a compact description of its internal arrangement. The text does not provide a detailed floor plan or explain how the animals were distributed among the levels.

The three-deck design is separate from the Ark's overall dimensions of 300 cubits long, 50 cubits wide, and 30 cubits high. Those measurements describe the vessel's size, while the lower, second, and third decks describe its vertical organization.

Later illustrations often add elaborate ramps, stalls, cages, or multiple compartments. Such features may be imaginative reconstructions rather than details stated in Genesis. The biblical specification is simply three levels, making “three decks” the direct answer.