How to use it
- Enter the post diameter in inches.
- Enter the hole depth in feet.
- Enter the number of holes you need and click Calculate.
This tool tells you exactly how much concrete you’ll pour when you set fence posts, converting your hole dimensions into three practical units. Knowing the cubic‑yard total helps you order the right amount of ready‑mix from the supplier, while the cubic‑foot figure lets you compare on‑site measurements. The bag count translates that volume into the standard 80‑lb mix bags, so you never guess or over‑order. Just plug in the post diameter, the depth of each hole, and the number of posts; the calculator does the geometry and unit conversion instantly. The results appear as cubic yards (the metric used by most concrete trucks), cubic feet (useful for manual calculations), and the exact number of 0.6‑cf bags you’ll need today.
Pro tips
- Add 5‑10% extra volume to cover spillage and uneven ground.
- Round up bag count to the next whole bag; you can’t buy a fraction.
- Order bags in multiples of a full pallet to save on delivery fees.
- Double‑check hole depth before calculating; a shallow typo can cut material by half.
Real-life examples
- A homeowner installing a 150‑ft wooden fence and needs concrete for each post.
- A landscaper preparing a garden fence with 8‑inch posts set 3 ft deep.
- A contractor estimating material for a commercial property’s chain‑link fence with 30 posts.
Case study
Mike was unsure how many bags of concrete to buy for his new backyard fence. After entering his 4‑in post diameter, 2‑ft hole depth, and 12 posts, the calculator showed 2.4 cubic yards, 129 cubic feet, and 215 bags. He ordered exactly that amount, avoided a costly overrun, and completed the fence on schedule.