How many cubic feet in a 80lb bag of quikrete

Hi guys, I am Eagle54 and I am new to the site. From what I have read so far I must tell you I am impressed. Great site. BUT, I do have a question that has me bugged,,,
Does anyone know how much or what yardage is in an 80 lb bag of quikrete.?? :wallbash:

Might be wrong, but I think an 80lb bag makes a cubic foot of concrete.

JVC

The rule of thumb we use is .6' cubic, or 2/3 cubic feet. With 27 cubic feet to the cubic yard, you're looking at 40.5 - 45 bags to the yard, depending on if you use .6 or .667.

I guess I dont get it so I will explain what I am Doing

I have to lay out a slab for a 45 gal air compressor. The measurements for what I have framed are;
34"in length x 33.5" in width x 5" deep,,,
How many 80 lb bags of Quikcrete will I need to use???
I know it will take .097512 yards + 5% = .102388 yards. So how many 80 lb bags will I need to mix for this slab??:hang:

No comment. I may just go and watch Survivor.

A 94# bag is 1 cubic foot.Using the 3 halfs rule you would need 3 94# or 3.525 80# bags to get 2 cubic feet.You'll need 4.87238895 bags but I'd get 5 just to be safe.

i hate to admit this but i just poured a hadicap ramp and used quik crete.the ramp was 48"x60"x4".we used 22 bags to pour this ramp.

Good link Tom:thumbsup:

Seems a good rule of thumb is figure 3700# of mix per cubic yard.

...48"x60"x4".we used 22 bags to pour this ramp.

I hope (for your sake) they were 40# bags

Thanks

Well Guys, I have about 6 Different answers and best I can cume up with is about 6 80lb bags to be safe. Thanks alot and have a good evening. I had a good time with this and the site, You can bet I will be back for more construction and building needs and a good time . Good Night Eagle54

Oh, By The Way; I looked all over the bag and did not find any information about what I needed, But thanks for the web site, that was a big help. Eagle54

The last 80lb bag I saw was telling me to get the hell off her grass.:w00t:

However she was very pleased when I left.

Bob

I agree with tkle, - - 5 bags should be plenty . . .

5 bags should be plenty...

...to be a bag short.:whistling

Cubic foot = 12"x12"x12"=1728" cubic
34"x33.5"x5"=5695" cubic
5695" cubic/1728"cubic (one cubic foot)=3.2957'
cubic
3.2957' cubic/0.6' cubic (volume of concrete in 80lb. bag) = 5.49 bags.

Better get 6 bags.

As far as I know, tkle is accurate that 94# is one cubic foot (actually I kinda thought it was 96#).

Anyway, presuming that to be correct 33.5" X 34" X 5" = 5695 cu. in. which equals 3.295 cu. ft.

3.295 cu. ft. X 94# = 309.73#

309.73# divided by 80# = 3.87 bags

Again, - - 5 bags is PLENTY.

Won't hurt ya' to get 6 though, - - you'll just be eatin' one bag, - - (remember to chase with water :laughing

The logic of a bag being .6 cu. yd. may be based on a 60# bag.

80# bag based on 94# per cu.ft. = .85 cu.ft.

60# bag based on 94# per cu.ft. = .63 cu.ft.

Maybe the calculator has 'motivation', - - over-allowing for your waste (and possible over-dig?) and their profits.

Seems to me that this is comparing apples and oranges. That 94 lb bag is a bag of portland cement--no aggregate. That one cubic foot should be the volumn of dry powder in the bag. The 40, 60. 80 lb bags the calculator is working with are quick crete--aggregate and portland mixed in just add water proportions. Most concrete that comes in a truck is 4, or 5. and sometimes even 6 sack mix- ie that many 94lb bags per cubic yard (27 cubic feet) of mix.

JVC

Just buy the 6 bags and return one if you've got too many!

There, problem solved! :cheesygri

Don't return 'em to me; we don't take them back.

An 80# bag of regular concrete mix is .66 cubic foot. That is the size of the bag, and has nothing to do with the weight. A pallet of 80# Concrete mix (42 bags) is a CuYd (27.72) of concrete for purposes of guesstimating.

A cubic foot of Type I portland weighs 94#
An approximate (a tad less) cubic foot of Masonry Cement weighs 70# (N) or 75# (S).

A five gallon bucket filled to the top ring is 1 CuFt.