#1
03-24-2004, 12:08 AM
 aperfectlawn LawnSite Member Join Date: Oct 2003 Location: Jonesboro, AR Posts: 175
Calculating S.F.

What is the best way to calculate square tootage it it is a irregular or multi-curved area? I understand (lenght x width), just not sure about curves.
#2
03-24-2004, 12:09 AM
 aperfectlawn LawnSite Member Join Date: Oct 2003 Location: Jonesboro, AR Posts: 175
Re: Calculating S.F.

What is the best way to calculate square footage if it is a irregular or multi-curved area? I understand (lenght x width), just not sure about curves. Not a typeist.
#3
03-24-2004, 12:36 PM
 D Felix LawnSite Bronze Member Join Date: Jan 2004 Location: Putnam County, Indiana Posts: 1,905
I generally try to figure what the average length and width is. Break the area into sections if you have to. Add a little as 'fudge' factor too.

Dan
#4
03-26-2004, 02:39 AM
 Critical Care LawnSite Bronze Member Join Date: Nov 2003 Location: Central Oregon Posts: 1,654
Like Dan said, you may want to break the area down into sections. Length*width is for a rectangle, parallelogram, or square, but from that you can easily figure a triangle. A triangle is just half. Picture a business card with a line drawn from the top left corner down to the bottom right, that divides the rectangle into two triangles. And a circle is pi*r(2), but if you see a “D” shaped area you could get close by figuring it as one half of pi*r(2). And some things you can average out, like when you see an “S” shape edge. If you drew a line right down those curves it would look like “\$” with equal areas to the left and right.

When I have to calculate areas such as for an irrigation plan, I take several key measurements and with an engineers rule I draw an outline of the area to scale onto graph paper. One inch may equal ten, twenty feet, or whatever. Or, one square may equal that. If your drawing is fairly accurate, you can have the whole area scaled down into lots of little 100 or 400 s.f. squares which you can add up for your total.
#5
03-26-2004, 11:17 PM
 DJL LawnSite Member Join Date: Dec 2003 Location: Central New Jersey Posts: 237
You could try this:

Take a walking meter and run it along the curves. Multiply that times an average width. I find it works pretty well. I can get within 1/2 yard. Of course you want to make sure you aren't short 1/2 yard.
#6
03-28-2004, 08:16 AM
 KenH LawnSite Bronze Member Join Date: Jun 2002 Location: CT Posts: 1,622
There is a tool called a planimeter. Draw the area to scale, trace over it with the planimeter, do a calculation, and done. I use it to find sqaure footage of irregular shaped pools and patios. Got mine on Ebay for 30\$.

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