First Line Sales
PO Box 200
Vernon, VT 05354

www.firstlinesales.com

Construction Estimating Formulas & Useful Information

Formulas, equations, tables, facts, specifications and other
information useful in planning and estimating construction,
decorating and other projects.

 Measure of Dimensions, Theorem   Formulas, Rectangles, Squares, Triangles & Circles  Board Feet Concrete Estimating  Decimal and Metric Equivalents  Weights, etc.  Metrics  Energy, Electric, Insulation Drywall Estimating,  Door Handing

7.  Concrete:  Concrete is usually measure in cubic yards.  A cubic yard is 3' wide x 3' long x 3' thick.  3' x 3' x 3' = 27 cubic feet.  27 cubic feet = 1 cubic yard.

The formula is:  L' x W' x T' 27 = cubic yards.
                        -or-
                        L' x W' x T" 12 27 = cubic yards (where T is in inches).
                        -or-
                        L" x W" x T" 1728 27 = cubic yards (where L, W, T, are in inches).

One cubic yard covers 324 square feet at 1" thickness.

One cubic yard is equal to approximately 40 bags of 80 pound concrete mix (+/- .675 cu' per bag).

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The table below shows how many (approx.) 80 pound bags of concrete mix it will take to fill these tubes used to construct concrete piers, etc.

Diameter of tube Approx. number of 80 pd. bags To fill this many feet
6" 1 bag 3 feet
8" 1 bag 2 feet
10" 1-1/2 bags 2 feet
12" 2-1/2 bags 2 feet
14" 1-1/2 bags 1 foot
30" 7-1/2 bags 1 foot
Formula: Diameter squared x .7854 x height.  For example 30" x 30" x .7854 = 706.86 144 (to convert from cubic inches to cubic feet) = 4.91 cu. ft. .675 cu. ft. per bag = 7.27 bags (rounded to 7-1/2).

One 80 pound bag of concrete mix will cover an area approximately 2' x 4' x 1'.

 

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 Measure of Dimensions, Theorem
 Formulas, Rectangles, Squares, Triangles & Circles
 Board Feet
Concrete Estimating
Decimal and Metric Equivalents
 Weights, etc.
 Metrics
 Energy, Electric, Insulation
Drywall Estimating,  Door Handing


This information is believed to be accurate.  The Polymer Roof Factory or First Line Sales will not be liable for errors and omissions.  Specifications, detail, and other information should be verified by the user.