Enter your integer into the appropriate boxes, and click Calculate

For irregular shapes, Use these formats to achieve square footage Shape Formula Calculator inputs Multiply length by width.  length x width = Sq. Area Square the circle’s radius; multiply by 3.1416. diameter Halve the base length; multiply by height. Or, multiply the base length by the height and divide by 2. base length x height / 2 Square the short diameter; multiply by .866. short diameter Square the short diameter; multiply by .828. short diameter Draw the project out on graph paper, with 1/4 inch representing 1 foot. Count up the number of squares. Partial squares count as one. length, width

Other easy to use Formulas for Quick Estimations  

Slabs .003125 : If you know the total square footage of the area to be poured.  Simply multiply the thickness of the slab in inches, by our magic # .003125, then multiply that by the square footage. This is a very accurate method. Always to plus side by no more then 2-3%.

example:

                                   a slab 60 ft. x 40 ft. = 2400 sqft.
                                     if the slab is poured @ 4 inches then
                         step#1     4 x .003125 = 0.0125 this is our multiple
                         step#2      2400 sqft x 0.0125 = 30 cu.yrds.

 
 3 in.= .009375                   4 in.= .0125                  5 in.= .015625
 6 in.= .01875                     8 in.= .0250                10 in.= .03125
12in.= .0375                     16 in.= .05                    24 in.= .075
36in.= .1125                     48 in.= .15                    72 in.= .225

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