Genesis 6:15

6:15 This is how you should make it: The ark is to be 450 feet long, 75 feet wide, and 45 feet high. ¹ 

[6:15]  ¹ 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.