In Genesis, how long was Noah's Ark according to its stated dimensions?

According to Genesis, Noah's Ark was 300 cubits long.

Genesis 6:15 gives the Ark's dimensions as 300 cubits in length, 50 cubits in width, and 30 cubits in height. A cubit was an ancient unit commonly linked to the distance from an adult's elbow to the end of the hand, so its exact modern equivalent is uncertain.

Using common estimates of roughly 44–52 centimetres per cubit, the Ark would have been about 132–156 metres long. That makes the biblical vessel comparable in length to a large modern ship, although the text does not provide enough information to reconstruct every detail of its design.

The dimensions are sometimes mistakenly converted into one exact modern measurement. In fact, ancient cubits varied by culture and period. The important point in the Genesis account is the stated ratio: the Ark was six times longer than it was wide and ten times longer than it was high.