Using Genesis’s stated 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 ratio of 6:1. The text also gives a height of 30 cubits, making the stated proportions 300 by 50 by 30 cubits.
This proportion is often discussed because it resembles the length-to-width ratio used for some stable modern barges and ships. That comparison does not prove a historical construction method or identify the ark as a surviving vessel; it simply describes the numerical proportions in the biblical account.
A cubit was an ancient unit whose exact length varied by culture and period. The ratio does not depend on converting cubits into modern units, which is why it is more secure than any exact claim about the ark’s length in meters or feet.