Having trouble figuring out the total cost of a contracting job or calculating the square yardage of a living room floor? Our comprehensive 3-panel (6-page) guide will be of incomparable assistance. Each page is full of charts, diagrams, formulas and equations covering elements of construction where math is needed—all arranged in our attractive, easy-to-use format. It is the perfect resource for the professional contractor or the do-it-yourselfer.