Exodus 38:1

Bezalel constructed the altar of burnt offering from acacia wood. It was square, five cubits long, five cubits wide, and three cubits high.

Note Literally He constructed

Note The altar was approximately 7.5 feet in length and width, and 4.5 feet high (2.3 meters in length and width, and 1.4 meters high).

BSB · Berean Standard Bible
And he made the altar of burnt offering of shittim wood: five cubits was the length thereof, and five cubits the breadth thereof; it was foursquare; and three cubits the height thereof.
KJV · King James Version
He made the altar of burnt offering of acacia wood. It was square. Its length was five cubits, its width was five cubits, and its height was three cubits.

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.

WEB · World English Bible
And he made the altar of burnt-offering of acacia wood: five cubits was the length thereof, and five cubits the breadth thereof, foursquare; and three cubits the height thereof.
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

the altar
This altar consisted of four boards of {shittim} (acacia) wood, covered with brass, and hollow in the middle; but it is supposed to have been filled up with earth when used, for it is expressly said (ch. 20:24) that the altar is to be of earth. As it was five cubits long and five cubits broad, and three cubits high, if the cubit be reckoned at 21 inches, it must have been eight feet nine inches square, and about five feet three inches in height.
Exodus 27:1–8; Exodus 40:6, 29; 2 Chronicles 4:1; Ezekiel 43:13–17; Romans 8:3, 4; Romans 12:1; Hebrews 3:1; Hebrews 9:14; Hebrews 13:10; 1 Peter 2:5
foursquare; and three cubits the height thereof
Ezekiel 43:16; John 6:37; Hebrews 13:8; Revelation 21:16