Concrete Pier Calculator
Calculate concrete volume for piers, drilled shafts, and caissons with optional belled base.
Decision Guide
Pier and drilled-shaft buying decision
Piers become expensive when the geometry is wrong, not just when the volume is large. The key decision is whether the shaft, bell, and pier count still make this a simple bag job.
Bagged mix is still realistic
Use total waste-adjusted volume across all piers, not just one shaft, when you price the pour.
Belled bases and multiple piers can turn a small-looking job into a much larger material run.
Before you order
- Bell geometry changes volume faster than most people expect.
- Total pier count matters more than one sample pier.
- Irregular holes can justify extra margin beyond the clean math.
Next steps
- Confirm whether the pier includes a belled base.
- Price total waste-adjusted volume across all piers together.
- If the count grows, compare bags against one coordinated truck order.
Common mistakes
- Ignoring bell volume on belled piers.
- Pricing one pier and forgetting the whole run.
- Buying the exact shaft math with no field margin.
Use this as a planning guide. Engineering requirements and local soil conditions still control the final pier design.
1. Enter Pier Dimensions
Shaft diameter, depth, and optional bell.
Common: 10", 12", 14", 16" for decks
2. Results
Your pier concrete calculation.
Enter pier dimensions
Fill in the diameter and depth to calculate concrete volume.
About Concrete Piers
Concrete piers are deep foundation elements that transfer structural loads to competent soil or rock below. They are used for decks, porches, foundation repair, and new construction where shallow foundations are inadequate.
Types of Concrete Piers
- Drilled Shaft: Cylindrical hole filled with concrete, most common type
- Belled Pier: Wider base (bell) at the bottom for increased bearing capacity
- Micropile: Small diameter (under 12") for tight spaces and retrofit work
When to Use Concrete Piers
- Deck Supports: 10-12" diameter, 3-5 feet deep
- Foundation Repair: 12-16" diameter, 10-20+ feet deep
- New Construction: 16-24" diameter, engineered depth
- Porch Columns: 12-14" diameter, below frost line
Standard Pier Sizes
| Diameter | Typical Depth | Application |
|---|---|---|
| 8-10" | 3-4 ft | Fence posts, small structures |
| 10-12" | 4-5 ft | Residential decks |
| 12-16" | 5-10 ft | Porches, additions |
| 16-24" | 10-20+ ft | Foundation repair, new construction |