Calculate the volume of cylindrical or rectangular holes for concrete or fill.
Hole Dimensions
Volume Results
Enter dimensions to calculate hole volume
About this calculator
Overview
Calculating hole volume is common for fence posts, footings, and landscaping. Whether it's a circular post hole or a rectangular footing, knowing the precise volume helps you buy the exact amount of concrete or soil needed.
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Pro Tips
Always order 10% extra concrete to account for uneven walls and spills.
For fence posts, a rule of thumb is that the diameter of the hole should be 3x the diameter of the post.
Check underground utility lines before digging any holes.
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Fun Facts
"Augers for post holes typically come in standard diameters like 6, 9, or 12 inches."
"One 80lb bag of 'pre-mixed' concrete fills approximately 0.6 cubic feet."
"The 'bell' at the bottom of a hole (common in footings) can add 20-30% more volume than a straight cylinder."
Formula: Circular: π × r² × d | Rectangular: l × w × d
