How to use it
- Enter the hole diameter in inches.
- Enter the depth in feet.
- Specify the number of holes you need.
- Read the cubic yards, bags and cubic feet results.
What it does – The Pier Hole Concrete Calculator takes the diameter of your pier hole, its depth, and the number of holes, then instantly shows the total concrete volume in cubic yards, the equivalent number of 80‑lb bags, and the volume in cubic feet.
Why it matters – Knowing the exact amount of concrete prevents over‑ordering, saves money, and ensures you have enough material to pour a solid foundation without costly trips to the store.
How to read the results – Cubic yards is the standard measure for delivery. 80‑lb bags tells you how many pre‑mixed bags to purchase (each bag yields 0.6 ft³). Cubic feet gives a quick sense of the raw volume. Use these numbers to plan your order and budget confidently. You can adjust the quantity to see how material needs scale for larger projects.
Pro tips
- Add a 10% waste allowance to cover spillage and variations.
- Round up the bag count to the next whole bag to avoid shortfalls.
- Order bags in multiples of 5 when possible for better delivery efficiency.
- Measure the diameter inside the form to avoid over‑estimating volume.
Real-life examples
- Homeowner building a deck calculates concrete for four 12‑in pier holes.
- Contractor installing fence posts determines bags for ten 8‑in holes.
- Landscape designer prepares a retaining wall and needs volume for six 10‑in footings.
Case study
John needed concrete for six 10‑in × 4‑ft pier holes. Using the calculator, he saw he required 0.9 cubic yards, which translates to 2 bags of 80‑lb mix. He ordered exactly two bags, saved $30, and completed the job without a mid‑project run to the supplier.