According to Genesis, what were the ark’s dimensions in cubits?

According to Genesis, Noah’s ark measured 300 by 50 by 30 cubits.

Genesis 6:15 gives the ark’s length as 300 cubits, its width as 50 cubits, and its height as 30 cubits. The following verse describes an opening, rooms, and three decks. The text therefore presents the ark as a large, structured vessel rather than a conventional ship designed for sailing.

A cubit was an ancient unit generally related to the length of a forearm, but its exact value varied. For that reason, converting the biblical dimensions into metres or feet involves an estimate. Using a common approximation of about 45 centimetres per cubit gives roughly 135 metres long, 22.5 metres wide, and 13.5 metres high.

The dimensions are sometimes confused with measurements from modern replicas or films. Those projects may use different scales, but the biblical figures themselves are 300, 50, and 30 cubits.