Based on Genesis dimensions, Noah's Ark had an approximate length-to-width ratio of 6 to 1.
Genesis 6:15 gives the ark as 300 cubits long and 50 cubits wide. Dividing 300 by 50 produces a six-to-one ratio, while the stated height is 30 cubits. This is a calculation from the biblical measurements rather than a separate measurement named by the text.
The proportions have attracted attention because a long, relatively narrow hull can offer directional stability. Modern naval architecture often studies length-to-beam ratios, although an ancient narrative's dimensions cannot by themselves establish how a real vessel would perform.
The ark is also described as a large rectangular chest or box-like vessel rather than a conventional sailing ship. Genesis gives no instructions for sails, a rudder, or propulsion, emphasizing preservation through the flood rather than navigation to a destination.