Charles Ellicott Commentary Exodus 27:18

"The length of the court shall be a hundred cubits, and the breadth fifty every where, and the height five cubits, of fine twined linen, and their sockets of brass." — Exodus 27:18 (ASV)

The length ... one hundred cubits. —Compare Exodus 27:9, where this is given as the length of the hangings.

The breadth fifty. —Compare Exodus 27:12.

The height five cubits. —This had not been previously either stated or implied. It has been noted that, with one exception, all the measurements of the tabernacle and the court, as distinct from the furniture, are either five cubits or some multiple of five. The one exception is the length of the inner covering (Exodus 26:2), which was determined by the pitch of the roof.