Bricks, Masonry, Asphalt and Concrete - Footings & Foundation for Work Shop

Its been a real long time since High School, I need help figuring how much concrete I need.
I'm building a 12X16 workshop, the footing will be 12" wide X 12" deep, with a 5" slab. Can someone please tell me how much concrete I need to have brought in? Better yet $ wise, is it feasible to mix and pour this myself in a day?

Any help would be appreciated.

Thanks,

Tony

5" slab at 12'x16' : 5"/12"/ft x 12' x 16'/27cf/cy = 3 cy
12" x 12" footer: 1' x 1' x 2x(12'+16')/27cf/cy = 2.07 say 3 cy

Whether it's feasible to mix this yourself depends on your comfort level with placing concrete. A truck may be worth the time saved.

Mixing concrete by hand ( or even with a portable mixer) is ok for up to a yard or so, but here's the breakdown on what you're thinking about.

Based on the 5.5 to 6 yds you'll need:

If you pour a 6 bag mix ( that will give you a "normal" 3000psi concrete):

-6 bags of Portland cement per yd @ 94 lbs/bag = 564 lbs

(These are approximates but not far off)

Twice that much sand...................say about 1000lbs
Three times that much aggregate ( gravel) 1500lbs
Water ....say 8-10gal/bag 400lbs

Thats roughly 3500 lbs per yd and you need 5.5 yds minimum. You'll be handling somewhere in the 20 to 25,000 lb range .....see why concrete trucks have all those axles and tires :) ....and if you do it by hand, you're gonna handle it TWICE.....once going in the mixer and once coming out.

Call the truck, be thankful you can and feed the driver a sandwich.

To do that by hand will break your back, give you a lousy job because it will be ready to work on one end before you get the other end mixed, and you won't save any money because buying the materials in small lots costs more than the concrete company pays for theirs.....not to mention how much your chiroprator is gonna hit you for :)

Thanks for the replies, I wasnt really considering doing it myself though..........my wife was thinking of that for me. She also thinks that I should do my own electrical work......not in this lifetime, I do well with lumber, not with concrete or electricity.
The plans said that I needed 9 yds of concrete, and like I said in the original post, its been a long time since High School, even so, I was figuring at no more than 7 yds. You verified what I was thinking.

Thanks again!

Tony