How many cubits long was Noah’s Ark in the Genesis measurements?

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

Genesis 6:15 lists the Ark’s dimensions as 300 cubits long, 50 cubits wide, and 30 cubits high. The length is the largest of the three measurements and establishes the vessel’s long, boxlike proportions in the biblical description.

A cubit was an ancient unit commonly related to the length of a forearm, but its exact value varied by culture and period. Because the biblical text does not define one modern conversion, estimates of the Ark’s length in meters or feet differ. The stable answer is the original measurement: 300 cubits.

The figure is sometimes confused with the Ark’s width or height. The dimensions are presented in length-width-height order, so 300 refers to length, 50 to width, and 30 to height. These measurements are textual details, not evidence for a surviving physical vessel.