Pier & Caisson Calculators
Explore our suite of free pier & caisson calculators to precisely estimate volume, weight, and costs for your next project. Select a tool below to get started.
Estimating Concrete for Piers and Caissons
Piers and caissons are deep foundation elements used to transfer structural loads through weak soil down to solid rock or stable strata. Since they consist of deep cylindrical shafts (and sometimes belled bottoms), calculating volume utilizes circular geometry.
Core Formula
Cylindrical Volume (yd³) = π × radius² × Depth (ft) ÷ 27
Frequently Asked Questions
- What is the difference between a pier and a caisson?
- Functionally they are similar deep foundations. Caissons generally refer to larger, watertight retaining structures installed into water or deep excavations, while drilled piers (or drilled shafts) are created by augering a hole into soil and filling it with concrete.
- How do I calculate a belled pier?
- You must calculate the volume of the cylindrical shaft and then add the volume of the bell (frustum of a cone). Our advanced calculators handle this compound math for you.
- Do these estimates account for soil collapse?
- No. If you drill into unstable soil and the hole caves or expands before pouring, the volume required will increase. Always add a healthy 10-15% overage.
- Can I pour piers using bagged concrete?
- Yes, for small deck footings or shallow piers (like fence posts). For deep structural piers, ready-mix concrete is highly recommended due to the massive volumes required.