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  • Concrete Cubic Yard to Bagged Sakrete

    I work in the fence industry and many times I need to figure out how many bags of concrete I'll need instead of ready-mix truck pours.

    I have a simple calculator I use in Excel, the formula is below, the cells it refers to is number of holes, depth and diameter and it outputs cubic yards needed for the job.

    I carry this with me on my PDA as well but I found that it is critical for me to find a simple way of calculating 60 and 80 pound bags as well at the same time.

    I have found plenty of online calculators such as this one which is awesome: www,decks.com/calculators/concrete.aspx but I really need to know the math behind it

    Can anyone help me out with this?

    Thanks in advance for any help.


    =(B3/12*0.5)^2*(3.14)*(D3/12)*(A3)/27

    Holes, Dia., Depth, C.Y. Needed, 60#, 80#, $ Per C.Y., Extended

  • #2
    Re: Concrete Cubic Yard to Bagged Sakrete

    That page uses server side scripting so the source is not available to view, so I cannot tell you the math behind that.

    I'm sure we can figure out what you need though.

    You have cubic yards, and need to know how many bags you need.

    I used that page to enter a square footing 3'x3'x3', which is 1 cubic yard, and it returned that I needed:
    60 pound bags = 54
    80 pound bags = 40.5

    So you just need to add additional cells to your Excel sheet and make it like:
    cubic yards * 54 = 60 pound bags
    cubic yards * 40.5 = 80 pound bags

    Comment


    • #3
      Re: Concrete Cubic Yard to Bagged Sakrete

      Careful, I'm a huge, hairy man that just might kiss you :P

      Thanks for the help friend, excellent site you got going here.

      Comment


      • #4
        Re: Concrete Cubic Yard to Bagged Sakrete

        The volume of cylinder, which is essentially what your hole is, goes as follows:

        V = pi X D^2/4 X Depth
        Where: pi is a constant, which is equal to about 3.14
        D = Diameter of the hole
        volume equals pi X Diameter squared divided by four times the depth

        Make sure inches are in decimal form, which is done by dividing the # of inches by 12.

        The solution will be in cubic feet.

        Multiply this number by the number of holes and this will be the total volume of concrete needed.

        There are 0.6 cubic feet in an 80lb bag of concrete and 0.45 CF in a 60 lb bag.

        So take the total volume of concrete needed and divide by 0.6 or 0.45 depending on which size bag is to be used.

        Its really not all that difficult for example. I have 10 holes that are 1.5' wide by 2.5' deep.

        3.14 X (1.5 X 1.5) / 4 X 2.5 = 3.14 X 2.25 / 4 X 2.5 = 4.42cf
        4.42 CF X 10 holes = 40.2 cf total of concrete required
        40.2/.6 = 67 bags of 80lb concrete

        TKOBY

        Comment


        • #5
          Re: Concrete Cubic Yard to Bagged Sakrete

          Calculators have been created to help assist in this:

          sakrete.com/products/calculators.cfm

          Comment


          • #6
            Re: Concrete Cubic Yard to Bagged Sakrete

            Originally posted by sakrete View Post
            calculators have been created to help assist in this:

            Sakrete.com/products/calculators.cfm
            how many bags of 60#sakrete to ndo a side walk thats 4' wide x 39' long x 4" deep.

            Comment


            • #7
              Re: Concrete Cubic Yard to Bagged Sakrete

              Originally posted by Unregistered View Post
              how many bags of 60#sakrete to ndo a side walk thats 4' wide x 39' long x 4" deep.
              4" = 1/3 ft
              4 ft x 39 ft x 1/3 ft = 52 ft
              An 80 lb bag is 0.6 ft: 52 ft/0.6 ft = 87 bags
              54 ft = 2 yd, you might be better off getting 2 cubic yards delivered mixed.

              Comment


              • #8
                Re: Concrete Cubic Yard to Bagged Sakrete

                CUBIC INCHES OF FINISHED CONCRETE FOR ONE BAG OF 60# SACRETE = 8415 CU IN PER BAG ? The correct answer should be on the bag.
                Last edited by JohnS; 09-11-2011, 02:48 AM.

                Comment


                • #9
                  Re: Concrete Cubic Yard to Bagged Sakrete

                  Originally posted by Unregistered View Post
                  CUBIC INCHES OF FINISHED CONCRETE FOR ONE BAG OF 60# SACRETE = 8415 CU IN PER BAG ? The correct answer should be on the bag.
                  A 60 lb bag makes up 0.45 ft or about 778 in.

                  Comment


                  • #10
                    Re: Concrete Cubic Yard to Bagged Sakrete

                    Originally posted by Sakrete View Post
                    Calculators have been created to help assist in this:

                    sakrete.com/products/calculators.cfm
                    How many 80 lb bags to make 1.5 yards?

                    Comment


                    • #11
                      Re: Concrete Cubic Yard to Bagged Sakrete

                      Originally posted by mark b. View Post
                      How many 80 lb bags to make 1.5 yards?
                      Per Sakcrete calculator, one 80 lb bag makes up 0.6 ft
                      1.5 yd x 27 ft/yd x 1 bag/0.6 ft = 67.5 bags

                      (45 bags/yd)

                      Comment


                      • #12
                        Re: Concrete Cubic Yard to Bagged Sakrete

                        i need 3" deep by 4ft by 5 ft how many bags of 60lbs concrete do i need. please help thx gmc

                        Comment


                        • #13
                          Re: Concrete Cubic Yard to Bagged Sakrete

                          Originally posted by Unregistered View Post
                          i need 3" deep by 4ft by 5 ft how many bags of 60lbs concrete do i need. please help thx gmc
                          Sakrete calculator says 11 bags.

                          Each 60 lb bag is about 0.45 ft, you need 5 ft.

                          Comment


                          • #14
                            Re: Concrete Cubic Yard to Bagged Sakrete

                            How many bags premixed to equal 1.85 cubic meters

                            Comment


                            • #15
                              Re: Concrete Cubic Yard to Bagged Sakrete

                              Originally posted by Unregistered View Post
                              How many bags premixed to equal 1.85 cubic meters
                              Depends on weight of bag. Here, we get 80 lb bags that make up 0.6 ft.
                              1.85 m is 65.33 ft so 109 bags. Sakrete has a calculator.

                              You might be better of with poured readimix.

                              Comment

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