In the Genesis account of Noah’s Ark, how long was the vessel?

In the Genesis account of Noah’s Ark, the vessel was 300 cubits long. Genesis 6:15 gives this length together with its width of 50 cubits and height of 30 cubits.

A cubit was an ancient unit based broadly on the length of a forearm, so its exact modern equivalent is uncertain. Depending on the convention used, 300 cubits is often estimated at roughly 135 to 157 metres, or about 450 to 515 feet.

The biblical text does not define the cubit used in the Ark measurements. That uncertainty means modern conversions should be treated as estimates, while the textual answer remains 300 cubits.

The Ark’s stated proportions are approximately 6:1 in length to width. Naval researchers and biblical commentators have often noted that this elongated shape would favor stability, though Genesis presents the measurements as divine instructions rather than a modern engineering specification.