Calculated Industries 44060 Construction Master Pro DT Advanced math functions - works in and converts between feet, inches, fractions and metric&#8211;including square and cubic Custom rafter and jack rafter functions for regular and irregular pitched roofs; easily find hips, valleys and jacks plus cuttng angles Stair function provides the total string of dimensions for risers, treads, stringer length, incline angle &#8211; complete stair layout Circular solutions are built-in for arches, column/cone, pillars, windows, post holes and more Full trigonometric functions &#8211; sine, cosine tangent, arcsine, arccosine and arctangent &#8211; will simplify complex construction math