In the biblical account of Noah’s Ark, how many cubits long was the Ark?

In the biblical account of Noah’s Ark, the Ark was 300 cubits long. Genesis 6:15 gives its dimensions as 300 cubits in length, 50 cubits in width, and 30 cubits in height.

A cubit was an ancient unit based broadly on the length of a forearm, although its exact historical value varied. Using a common estimate of about 45 centimeters, the stated length would be approximately 135 meters, or 450 feet. The biblical text does not specify which ancient cubit standard it uses.

These dimensions give the Ark a length-to-width ratio of 6:1. Modern comparisons sometimes relate this proportion to the stability of large vessels, but Genesis presents the measurements as part of divine instructions rather than as a naval engineering study. The dimensions also should not be confused with later artistic reconstructions, which often add features not described in Genesis.