Genesis 6:15

And this is the fashion which thou shalt make it of: The length of the ark shall be three hundred cubits, the breadth of it fifty cubits, and the height of it thirty cubits. Figuring a cubit at a foot and a half, the dimensions of the ark were 450 feet in length, 75 feet in width, and 45 feet in height. The cubic contents of the vessel thus exceeded 1,800,000 cubic feet, and afforded ample room for the purpose which the ark was to serve, being able, as has been demonstrated, to carry a cargo greater by one-third than any other form of like cubical content.