Builders, contractors, carpenters and construction professionals use this advanced, easy–to–use Feet–Inch–Fraction, Metric and Full Trigonometric calculator to provide rapid solutions to complex construction–math problems. Work in and convert between all building diminsional formats, including square and cubic! Built–in functions include Custom and Jack Rafter keys with instant cutting angles, Rake–Wall key, complete Circular solutions, full Stair calculations, D:M:S to Decimal Degree conversions, automatic Block and Footing, three Memories, and a Preference Function for user–defined options.