Exodus 30:2

It is to be square, a cubit long, a cubit wide, and two cubits high. Its horns must be of one piece.

Note The altar was approximately 1.5 feet in length and width, and 3 feet high (45.7 centimeters in length and width, and 91.4 centimeters high).

A cubit shall be the length thereof, and a cubit the breadth thereof; foursquare shall it be: and two cubits shall be the height thereof: the horns thereof shall be of the same.

Its length shall be a cubit, and its width a cubit. It shall be square, and its height shall be two cubits. Its horns shall be of one piece with it.

Note A cubit is the length from the tip of the middle finger to the elbow on a man’s arm, or about 18 inches or 46 centimeters.

A cubit shall be the length thereof, and a cubit the breadth thereof; foursquare shall it be; and two cubits shall be the height thereof: the horns thereof shall be of one piece with it.