How many cubits long was Noah’s Ark in the Genesis description?

Genesis describes Noah’s Ark as 300 cubits long.

Genesis 6:15 gives three dimensions: 300 cubits in length, 50 cubits in width, and 30 cubits in height. The length is the largest of the three measurements and is the figure requested here.

A cubit was an ancient unit based broadly on the length of a forearm, but its exact value varied by culture and period. Because the biblical text does not define one universally fixed cubit in modern units, converting the Ark’s dimensions into metres or feet involves an estimate.

The dimensions describe the Ark as a large rectangular vessel rather than a conventional ship designed for speed or navigation. Genesis also mentions three levels, rooms, a side door, and a covering. The 300-cubit length should not be confused with proposed modern reconstructions, whose exact dimensions depend on assumptions about the cubit and the interpretation of the text.