Exodus 25:10

And they are to construct an ark of acacia wood, two and a half cubits long, a cubit and a half wide, and a cubit and a half high.

Note The ark was approximately 3.75 feet long, 2.25 feet wide, and 2.25 feet high (114.3 centimeters long, 68.6 centimeters wide, and 68.6 centimeters high).

BSB · Berean Standard Bible
And they shall make an ark of shittim wood: two cubits and a half shall be the length thereof, and a cubit and a half the breadth thereof, and a cubit and a half the height thereof.
KJV · King James Version
“They shall make an ark of acacia wood. Its length shall be two and a half cubits, its width a cubit and a half, and a cubit and a half its height.

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 they shall make an ark of acacia wood: two cubits and a half shall be the length thereof, and a cubit and a half the breadth thereof, and a cubit and a half the height thereof.
ASV · American Standard Version

Related passages

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

Exodus 25:10
an ark.{Aron} denotes a chest, or coffer, in general; but is applied particularly to the chest or ark in which the testimony or two tables of the covenant were laid up; on the top of which was the propitiatory or mercy seat; and at the end of which were the cherubim of gold; between whom the visible sign of the presence of God appeared as seated upon his throne.
Exodus 37:1–3; Deuteronomy 10:1–3; 2 Chronicles 8:11; Hebrews 9:4; Revelation 11:19