How long was Noah’s Ark, using the cubit measurement given 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. The text uses the ancient cubit, a measurement traditionally based roughly on the length of a forearm, so its exact modern equivalent is uncertain. Depending on the cubit standard used, 300 cubits is often estimated at roughly 135 to 157 metres.

The proportion is notable: the ark is described as six times longer than its width and ten times longer than its height. Modern replicas and engineering discussions often use these proportions, but the biblical description does not provide enough information to reconstruct every structural detail.

The ark’s measurements should not be confused with later artistic depictions, which vary greatly in shape and scale. Genesis presents a large rectangular vessel with rooms, a roof, and an opening. The text does not identify a modern shipbuilding design or specify the exact length of its cubit.