Calzone

According to Halachos of Brochos (handbook - page 19):

Brocho before eating this: Borei Minei Mezonos

Brocho after eating the proper shiur of this: Al Hamichya [provided a proper shiur of Mezonos is eaten. Otherwise, Borei Nefashos]

If one is Koveah Seduah on this item, Hamotzi Lechem Min Ha'aretz and Bentching are required.

According to The Laws of B'rachos it depends on how much is eaten:

If a small piece is eaten as a snack, the Brocho before eating is: Borei Minei Mezonos and after a proper shiur, Al Hamichya

If it's eaten as or with a meal, the Brocho before is Hamotzi Lechem Min Ha'aretz and after is Bentching