In the biblical Noah’s Ark story, what was the ark’s length in cubits?

In the biblical Noah’s Ark story, the ark’s length was 300 cubits. Genesis 6:15 gives the vessel’s dimensions as 300 cubits long, 50 cubits wide, and 30 cubits high.

A cubit was an ancient unit based broadly on the length of a forearm, but its exact standard varied by culture and period. Using a common estimate of about 45 centimeters, 300 cubits would be roughly 135 meters, or about 450 feet. The conversion is approximate because the biblical text gives cubits rather than modern units.

The dimensions produce a long, rectangular vessel rather than the boat shape common in illustrations. Genesis also describes three decks, rooms, a side door, and a window. These specifications are part of the narrative’s construction plan, though the text does not provide enough engineering detail to reconstruct every structural feature with certainty.