Feet-Inch-Fraction Construction-Math Calculator. The Construction Master 5 is the essential tool for serious building professionals. Easy-to-use in the field or office it meets the need for fast, accurate construction- math solutions. Enter the numbers, just as you would say them and the solutions appear in an instant theyre built-in to your Construction Master 5. Ideal for plans, and layouts. Reduce the risk of expensive errors when estimating costs and materials. Save time, money and frustration! Works in and converts between building dimensional formats: Yards, Feet-Inch-Fractions, Decimal Feet-Inches and Metric including Area and Volume. Find Weight per Volume. Stair calculations for Risers, Treads, Stringer Length and Incline Angle; displays Run and Rise. Custom Rafter Function provides Common Rafters, Regular and Irregular Hips, Valleys and Jacks. Jack Rafter feature provides complete solutions for Regular and Irregular Pitch roofs. Displays On-center spacing. Solutions for Circles, Arcs, Columns, Pillars, Windows, Post-holes and more. Rake-Wall function determines Stud Length for any On-center Spacing, in Ascending or Descending order. Board Feet Lumber estimating. Hard door cover.