In the Genesis flood narrative, what was the Ark's stated length?

In the Genesis flood narrative, the Ark's stated length was 300 cubits.

Genesis 6:15 gives three dimensions: 300 cubits long, 50 cubits wide, and 30 cubits high. A cubit was an ancient unit commonly related to the length of a forearm, but its exact value varied by culture and period.

Because the cubit's modern equivalent is uncertain, converting the Ark's dimensions into metres or feet produces estimates rather than a single scriptural measurement. Using a common cubit estimate, the proposed length is roughly 135 metres, but the biblical number itself is 300 cubits.

The dimensions have inspired modern replicas, including the Ark Encounter project in Kentucky, which uses the biblical proportions. A replica's construction does not establish the historical existence of the vessel; it illustrates the stated measurements.