Bored Pile Foundation Calculator
Calculate concrete volume and reinforcement steel requirements for bored pile foundations. Supports Metric and Imperial units for civil engineers.
About
Bored piles (drilled shafts) are a high-capacity deep foundation solution used when shallow foundations cannot support structural loads. Estimating the material requirements for these massive cylinders is a daily task for geotechnical and structural engineers.
This calculator streamlines the estimation process by computing the exact volume of concrete required (including a waste factor margin) and the weight of the steel reinforcement cage. Whether you are designing for a skyscraper or a bridge, accurate material take-offs are crucial for budgeting and logistics, especially given the high cost of ready-mix concrete and steel.
Formulas
The volume of the pile is calculated as a cylinder:
The total weight of the reinforcement cage combines longitudinal bars and helical ties:
Reference Data
| Material / Parameter | Standard Value (Metric) | Standard Value (Imperial) | Notes |
|---|---|---|---|
| Concrete Density (Plain) | 2400 kg/m³ | 150 lb/ft³ | Standard Mix |
| Concrete Density (Reinforced) | 2500 kg/m³ | 156 lb/ft³ | With Steel |
| Steel Density | 7850 kg/m³ | 490 lb/ft³ | Carbon Steel |
| Standard Pile Dia (Small) | 300 - 600 mm | 12 - 24 in | Residential |
| Standard Pile Dia (Large) | 600 - 3000 mm | 24 - 120 in | Bridges/High-rise |
| Overbreak / Waste Factor | 5% - 10% | 5% - 10% | Dep. on Soil Stability |
| Rebar Size (Common) | 16mm, 20mm, 25mm, 32mm | #5, #6, #8, #10 | Longitudinal Bars |