Just repurposed my 3/8" x 50' wort chiller to a 3" coil. Compressed its about 12.5" and relaxed its 14".
On a side note I returned the copper, down graded to refridgeration grade, swithced stores, and upgraded the diameter. 1/2" x 50' for $38 at lowes.
Also return the rain cap for an elbow...