What measurement does Genesis give for the length of Noah’s Ark?

Genesis gives Noah’s Ark a length of 300 cubits.

Genesis 6:15 lists the Ark’s dimensions as 300 cubits long, 50 cubits wide, and 30 cubits high. The biblical unit called a cubit was based broadly on the length of a forearm, so its modern metric equivalent is uncertain. Depending on the cubit used, the Ark’s length is often estimated at roughly 135 to 157 metres.

The dimensions describe a long, boxlike vessel rather than a conventional ship with a pointed bow. Modern reconstructions therefore focus on its proportions and stability, while acknowledging that the text does not supply a complete naval design. The length figure is distinct from the Ark’s width, height, and three-level arrangement.