Advanced Construction Calculator is a handy tool when you're working on construction projects & need to convert between dimensions like feet, inches & pounds is a critical need. It features the ability to solve a variety of construction-related equations, calculate material estimates & costs, & display results in fractional or decimal forms. Use it for diagonal, rafter & roofing equations (built-in) as well as stairway construction functions including circular calculations. This eight-digit calculator with fractions also estimates building materials needed to ensure costs aren't wasted. Calculate equations using U.S. Imperial units or the metric system. Protective, hardcover case is shock-resistant & spillproof. Calculator includes a protective case, pocket reference guide & full instructional manual with online examples available paired with a series of instructional videos.