What was the length of Noah’s Ark in the Genesis dimensions?

The Genesis dimensions give Noah’s Ark a length of 300 cubits.

Genesis 6:15 describes the Ark as 300 cubits long, 50 cubits wide, and 30 cubits high. These dimensions are given as instructions to Noah before the Flood. The text uses the ancient unit called the cubit, traditionally related to the length of a forearm.

Because cubit lengths varied across historical cultures and periods, converting the Ark’s measurements into modern metres or feet is uncertain. Common estimates place the biblical Ark at roughly 137 metres long if a cubit of about 45.7 centimetres is used, but the exact modern conversion is not specified by Genesis.

The proportions—6:1 length to width and 10:1 length to height—have attracted discussion about stability and naval design. Such calculations can illuminate the shape described by the text, but they do not establish that the narrative records a surviving archaeological vessel.