In Genesis, how long does the Bible say Noah’s Ark was?

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

Genesis 6:15 lists the vessel’s three principal dimensions: 300 cubits long, 50 cubits wide, and 30 cubits high. A cubit was an ancient unit based roughly on the length of a forearm, so its modern equivalent is not perfectly fixed. Using common estimates, 300 cubits would be roughly 135 metres, or about 450 feet.

The passage presents the Ark as a large rectangular vessel rather than a conventional ship designed for speed or navigation. Its stated purpose was to preserve Noah, his family, and representative animal life through the Flood. Modern illustrations often make the Ark look like a pointed boat, but Genesis emphasizes its measurements and water-tight construction rather than a detailed nautical hull design.