We measure roofs in the number of squares.  A square is simply 100 square feet.

In the Fort Worth area, an average roof will cost you between $3,500 to $7500 on a 1,200 square foot house.  I am assuming you are talking about composite roofing shingles.  You are looking at about $100 for materials for each square.

The labor will be about $150 – $200 per square in Fort Worth.

When you add labor and material you get $250 – $300 per square depending on the materials and the roofing company that you choose.