In Genesis, how long was Noah’s Ark in cubits from bow to stern?

Genesis gives Noah’s Ark a length of 300 cubits, making that the traditional biblical measurement from bow to stern.

Genesis 6:15 lists three dimensions for the vessel: 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 exact modern equivalent is uncertain. Estimates commonly place the Ark’s length somewhere around 135 to 150 metres, depending on which cubit standard is used.

The proportions are approximately 6:1 in length to width and 10:1 in length to height. Those dimensions describe a large rectangular vessel rather than a ship designed for speed or navigation. The biblical account says the Ark was built to preserve life during the Flood, not to travel toward a destination.

The number is sometimes confused with proposed modern Ark replicas, whose dimensions vary. The biblical figure itself is specifically 300 cubits.