Genesis 6:15-16

6:15 This is how you should make it: The ark is to be 450 feet long, 75 feet wide, and 45 feet high. 6:16 Make a roof for the ark and finish it, leaving 18 inches from the top. Put a door in the side of the ark, and make lower, middle, and upper decks.

tn Heb “300 cubits long, 50 cubits wide, and 30 cubits high.” The standard cubit in the OT is assumed by most authorities to be about 18 inches (45 cm) long.

tn Heb “a cubit.”

tn Heb “to a cubit you shall finish it from above.” The idea is that Noah was to leave an 18-inch opening from the top for a window for light.