Advanced Construction-Math Calculator with Full Trigonometric Function. The Construction Master Pro Desktop is the most complete Builders Calculator on the market! With many powerful new built-in solutions and expanded preference selection; its easy to use to get the job done right the first time with fast, accurate solutions to construction problems. Perfect for completing layouts, bids and estimates saves time, money, materials and frustration. Work In and Convert Between any Building Dimension; Trigonometric Function; Find Weight per Volume; Built-in Right-Angle Solutions; Complete Stair Layouts; Roof, Rafter and Framing Solutions; Circular Calculations: Arcs, Circumference, Segments and More.