Calculator will calculate the necessary dimensions for the construction flat pattern segments lobsterback bend, elbow , tee piece, frustum cone and truncated pipe, flat back cone, oblique cone tee, offset tee, oblique transition from Squar/ Rectangle to Round, auger segment, transition from rectangle to square, truncated cone with an accessible vertex and triangulation method.

Calculation flat pattern used as a template for cutting the pipe, producing with wall thickness s = 0.