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How many bags of pre-mixed concrete teletubby6 09-21-2007
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Posted by on September 21, 2007, 7:24 am
How many 60lb bags of pre-mixed concrete will I need to make a 4 foot
by 4 foot sidewalk square at 4 inches thick? (16 sq.feet) I only
found one web based calculator and it said I need almost 40 bags. That
cant be right. Heck, the bags are close to 4 inches thick and they
are larger than a square foot. Math is not my thing....



Posted by Ralph Mowery on September 21, 2007, 7:38 am

> How many 60lb bags of pre-mixed concrete will I need to make a 4 foot
> by 4 foot sidewalk square at 4 inches thick? (16 sq.feet) I only
> found one web based calculator and it said I need almost 40 bags. That
> cant be right. Heck, the bags are close to 4 inches thick and they
> are larger than a square foot. Math is not my thing....
>

This one says 12 bags;

http://www.packagepavement.com/qk_concrete_calculator.html

You may need an extra bag or two to allow for uneven ground.

I used about 43 bags of the 80 lb size for a hole 3x3 feet and about 3 feet
deep.



Posted by Big_Jake on September 21, 2007, 5:59 pm
>
>
> > How many 60lb bags of pre-mixed concrete will I need to make a 4 foot
> > by 4 foot sidewalk square at 4 inches thick? (16 sq.feet) I only
> > found one web based calculator and it said I need almost 40 bags. That
> > cant be right. Heck, the bags are close to 4 inches thick and they
> > are larger than a square foot. Math is not my thing....
>
> This one says 12 bags;
>
> http://www.packagepavement.com/qk_concrete_calculator.html
>
> You may need an extra bag or two to allow for uneven ground.
>
> I used about 43 bags of the 80 lb size for a hole 3x3 feet and about 3 feet
> deep.

I get the same number. Maybe the OP calculated based on 16 CUBIC feet
instead of 16 SQUARE feet at 4" thick. The math seems about right.

JK


Posted by on September 21, 2007, 10:58 pm
On Fri, 21 Sep 2007 21:59:49 -0000, Big_Jake

>>
>>
>> > How many 60lb bags of pre-mixed concrete will I need to make a 4 foot
>> > by 4 foot sidewalk square at 4 inches thick? (16 sq.feet) I only
>> > found one web based calculator and it said I need almost 40 bags. That
>> > cant be right. Heck, the bags are close to 4 inches thick and they
>> > are larger than a square foot. Math is not my thing....
>>
>> This one says 12 bags;
>>
>> http://www.packagepavement.com/qk_concrete_calculator.html
>>
>> You may need an extra bag or two to allow for uneven ground.
>>
>> I used about 43 bags of the 80 lb size for a hole 3x3 feet and about 3 feet
>> deep.
>
>I get the same number. Maybe the OP calculated based on 16 CUBIC feet
>instead of 16 SQUARE feet at 4" thick. The math seems about right.
>
>JK


I have found it is faster to do these calculations in cubic inches if
you have one of those new fangled calculator things.

Posted by DanG on September 21, 2007, 7:39 am
4' x 4' =16 SF x .33333 = 5.33 CF x 155#/CF =826.66 lbs / 60# per
bag = 13.77 bags by my calculations.

Buy 15 to be safe.

--
______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)
dgriff237@7cox.net



> How many 60lb bags of pre-mixed concrete will I need to make a 4
> foot
> by 4 foot sidewalk square at 4 inches thick? (16 sq.feet) I
> only
> found one web based calculator and it said I need almost 40
> bags. That
> cant be right. Heck, the bags are close to 4 inches thick and
> they
> are larger than a square foot. Math is not my thing....
>
>



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