What measurement is given for the Ark’s length in Genesis?

Genesis gives Noah’s Ark a length of 300 cubits.

Genesis 6:15 specifies the ark’s dimensions as 300 cubits long, 50 cubits wide, and 30 cubits high. A cubit was an ancient unit commonly associated with the length from an elbow to a fingertip, but its exact value varied by culture and period. Because of that variation, the biblical measurement cannot be converted to one perfectly certain modern length.

Using common estimates, 300 cubits is roughly 135 metres or 450 feet, though proposed conversions differ. The ratio of the dimensions—6:1 length to width—is often discussed in relation to stability, because a long, broad hull can be more resistant to rolling than a tall, narrow one.

Genesis gives the measurements as literary and construction instructions, not as a modern ship-design specification. The text also says the ark had three levels and was covered with pitch, adding structural details beyond its basic dimensions.