Albert Barnes Commentary 1 Chronicles 11:23

"And he slew an Egyptian, a man of great stature, five cubits high; and in the Egyptian`s hand was a spear like a weaver`s beam; and he went down to him with a staff, and plucked the spear out of the Egyptian`s hand, and slew him with his own spear." — 1 Chronicles 11:23 (ASV)

Five cubits high — This is about seven and a half feet high. This height is not as great as that recorded for other giants.