This calculator computes volume for a round post hole in cubic feet and gallons and the weight and volume of soil removed.

round hole soil volume weight calculator

Circular Hole Volume Calculator

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    Details Post Hole Calculator for Round Holes

    by Titus Nelson, PE

    Inventor of the Holey-Moley Digger

    Use the following Calculator to determine the volume of a round post hole in (cubic feet) and (gallons), the weight of the soil removed and the new volume in (cubic feet) and (gallons) based on soil swell factor.  In addition, the calculated numbers can be used to determine the amount of soil that a Shop Vacuum will have to remove in Cubic Feet and Gallons and  Soil Weight in pounds.  Consequently, these numbers are especially relevant when selecting a shop vacuum as described in the blog article on Selecting The Best Hole Digging Shop Vacuum and for determining the size of a Shop Vacuum for digging holes.

    Finally,  see the blog page on Digging Deep, Straight, Uniform Holes with a Shop-Vac for relevant information.  We love feedback, let us know how you like these calculators.  If you would like to be kept up-dated on blog articles please sign up for more information here.

    The Soil Volume Weight Calculator Inputs

    Input – Select Soil Type

    1. Select Soil Type for Density

    2. Select Soil Type (same as above) for Swell factor

    Input – (diameter and depth – inches)

    3. Input Hole Diameter in inches

    4 Input Hole Depth in inches

    Soil Volume Weight Calculator Outputs

    Output (Volume)

    1. Hole Volume – Cubic Feet

    2. Hole Volume – Gallons

    Output (Weight)

    3. Soil Weight – Pounds

    Output – Swell Volume (increased volume after removal from hole)

    4. Volume – Cubic Feet

    5. Volume – Gallons


    This Calculator makes it easy to determine the volume of a  post hole and the weight of soil removed.  The result can be helpful when using a Holey-Moley Fence Post Hole Digger and for determining the size of a shop vacuum canister to hold the removed soil.


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