In Genesis, how long was Noah’s Ark supposed to be?

According to Genesis, Noah’s Ark was 300 cubits long.

Genesis 6:15 gives the Ark’s three main dimensions as 300 cubits in length, 50 cubits in width, and 30 cubits in height. Because the length of a cubit varied historically, modern conversions are approximate, but the biblical number itself is clear.

The Ark’s proportions are often compared with those of a large rectangular vessel rather than a conventional ship designed for speed. Its stated purpose was survival during the Flood, not navigation to a particular port. Artists and builders therefore make different assumptions about the exact shape and size.

The dimensions also appear in discussions of the Ark’s feasibility and in modern replicas. Those projects can illustrate the scale described in Genesis, but they do not establish a single universally accepted measurement in metres.