How big was Noah’s ark?

The measurements in Genesis

God gives Noah the plan in a few lines. The ship is to be made of “gopher wood,” a word that appears only here, so nobody knows what tree it means. It has rooms inside and is sealed with pitch. Then come the numbers.

This is how you shall make it. The length of the ship shall be three hundred cubits, its width fifty cubits, and its height thirty cubits.

A cubit is the length of a forearm, from elbow to fingertip. The common cubit is about 46 centimeters, or 18 inches. Do the math and you get:

• Length: about 137 meters (450 feet)
• Width: about 23 meters (75 feet)
• Height: about 14 meters (45 feet)

If you use the longer royal cubit of Egypt, about 52 centimeters, the ship grows to roughly 157 meters. Either way it is huge. It is longer than a football field and as tall as a four-story house. Genesis also adds a roof, a door in the side and three levels: “lower, second, and third” (Genesis 6:16).

A box, not a boat

Notice what is missing. Genesis mentions no mast, no sail, no oars and no rudder. This is not a ship you steer. It is a box built to float. The Hebrew word for it, tevah, means a box or chest, and English “ark” comes from the Latin arca, a chest. The word appears in only one other story in the Bible: the basket, sealed with pitch, that carries baby Moses on the Nile (Exodus 2:3).

The proportions matter too. Noah’s ark is six times longer than it is wide, a long, low hull. The older flood story in the Epic of Gilgamesh describes something very different. There the hero, Utnapishtim, builds a cube, 120 cubits on every side, seven levels high, sealed with bitumen.

How many animals fit?

Genesis doesn’t count the animals, but it does give the rule. Most people remember “two by two.” Read on and the text says seven pairs of every clean animal and of the birds, and two of the rest (Genesis 7:2–3). Eight people go aboard: Noah, his wife, their three sons and their wives. And then a short sentence: “Yahweh shut him in” (Genesis 7:16).

The construction itself gets one line. “Thus Noah did. He did all that God commanded him” (Genesis 6:22). No tools, no years counted, no crowds jeering. Those details came later, from preachers and filmmakers.