How to use it
- Enter hole diameter in inches.
- Enter depth in feet.
- Specify number of holes.
- Read cubic yards, bags, and cubic feet results.
This tool converts your post‑hole dimensions into the three units contractors use daily. Knowing the exact cubic yards tells you how much material to order from the supplier, while the bag count translates directly to the number of 80‑lb sacks you’ll need—each bag provides about 0.6 ft³. The cubic‑feet figure helps you compare against on‑site volume calculations or verify the calculator’s output. Simply input the diameter, depth, and quantity, then the calculator instantly shows the three results. Use the yard value for bulk orders, the bag count for budgeting, and the cubic‑feet number for quick on‑site checks. No guesswork, no over‑ordering.
Pro tips
- Add a 10% waste allowance for spillage or uneven ground.
- Round up bag totals; you can’t purchase a fraction of a bag.
- Order an extra bag for unexpected depth variations.
- Double‑check diameter measurements; a half‑inch error multiplies over many holes.
Real-life examples
- A homeowner installing a new fence needs to know how many concrete bags to buy for 12 post holes.
- A landscaper planning a row of garden posts wants the total cubic yards for a bulk delivery quote.
- A contractor estimating material for a deck foundation calculates bag count to match the job budget.
Case study
Mike needed concrete for 20 fence posts. Using the calculator, he saw he required 2.4 cubic yards, which translated to 4 bags (0.6 ft³ each). He ordered exactly four bags, avoiding a costly over‑order and completed the fence on schedule.