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  • linear feet to cubic yards

    I need to convert 221 linear feet of concrete into cubic yards, but I have a 18' X 8" in dia. pipe inside the concrete the thickness of the concrete is 2' 9" in thickness.........Please help!!!!!!!!

  • #2
    Re: linear feet to cubic yards

    Can you provide a bit more information? If I understand you correctly, you would do something like this:

    linear feet * width in feet * thickness in feet = cubic feet

    Now you will need to subtract the volume of the pipe.
    18 feet * (Pi * (4/12) * (4/12)) = 6.28 cubic feet

    cubic feet of cement - 6.28 cubic feet = total cubic feet

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    • #3
      Re: linear feet to cubic yards

      I guess I just type too much slower than gubment_cheez.

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      • #4
        Re: linear feet to cubic yards

        Originally posted by Robert Fogt
        Can you provide a bit more information? If I understand you correctly, you would do something like this:

        linear feet * width in feet * thickness in feet = cubic feet

        Now you will need to subtract the volume of the pipe.
        18 feet * (Pi * (4/12) * (4/12)) = 6.28 cubic feet

        cubic feet of cement - 6.28 cubic feet = total cubic feet

        I still don't understand.......what is Pi and why (4/12) what does this mean?

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        • #5
          Re: linear feet to cubic yards

          Originally posted by glo
          I still don't understand.......what is Pi and why (4/12) what does this mean?
          Pi is a mathmatical concept, it is the relationship of a circles radius to its circumference. It is a number equal to about 3.14, or some calculators give more accuracy up to about 3.1415926535897932384626433832795

          4 is inches, and 4/12 is a quick way to convert it to feet. Since all units need to be the same, for example cant multiply feet by inches, only feet by feet.

          4 inches / 12 = 4/12 = 0.333 feet
          18 feet * (3.14 * 0.333 feet * 0.333 feet) = 6.28 cubic feet

          But that is only the volume of the pipe. You subtract that volume from the volume of the cement, and you cant calculate that until you know the width.

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