Model pier quantities, depth, reinforcement, casing, and overhead. Review totals, unit rates, and cost drivers. Build faster estimates with cleaner inputs and practical outputs.
Choose a unit system, enter quantities and rates, then submit to estimate totals, unit costs, and major cost drivers.
This estimator combines excavation geometry, production rates, material quantities, and percentage-based adders. It is intended for preliminary budgeting, not final bid pricing.
Shaft Volume per Pier = π × (Diameter ÷ 2)² × Depth
Bell Extra Volume per Pier = [π × (Bell Diameter ÷ 2)² × Bell Height] − [π × (Pier Diameter ÷ 2)² × Bell Height]
Total Excavation Volume = (Shaft Volume + Bell Extra Volume) × Number of Piers
Billable Concrete Volume = Excavation Volume × (1 + Concrete Waste %)
Total Drilled Length = Number of Piers × Depth
Total Rebar Weight = Number of Piers × Depth × Rebar Weight per Length
Spoil Disposal Volume = Excavation Volume × (1 + Spoil Swell %)
Direct Subtotal = Concrete + Drilling + Casing + Steel + Spoil + Mobilization + Testing + Permit
Pre-Tax Total = Direct Subtotal + Overhead + Contingency + Markup
Grand Total = Pre-Tax Total + Tax
If bell diameter is not larger than shaft diameter, the calculator ignores added bell volume.
| Project | Piers | Diameter | Depth | Bell Diameter | Concrete Cost Rate | Drilling Rate | Estimated Total |
|---|---|---|---|---|---|---|---|
| Warehouse Column Grid | 8 | 3.00 ft | 40.00 ft | 5.00 ft | $185.00 / yd³ | $72.00 / ft | $51,860.00 |
| Retaining Wall Support | 12 | 2.50 ft | 28.00 ft | 0.00 ft | $178.00 / yd³ | $64.00 / ft | $49,430.00 |
| Commercial Entry Canopy | 6 | 1.75 ft | 22.00 ft | 3.00 ft | $192.00 / yd³ | $68.00 / ft | $22,740.00 |
It estimates concrete, drilling, casing, reinforcement, spoil disposal, mobilization, testing, permits, overhead, contingency, markup, and tax. That gives a practical conceptual budget for early planning and comparing options.
Yes. Enter bell diameter and bell height to include extra excavation and concrete. If the bell diameter is not larger than the shaft diameter, the added bell volume is ignored automatically.
Yes. Switch the unit system to metric. Then enter dimensions in meters, volume rates in cubic meters, and reinforcement rates in kilograms per meter for consistent results.
Excavated material usually expands after removal. Swell increases hauled volume and disposal cost. Adding this factor can produce a more realistic sitework allowance during budgeting.
No. It is best for preliminary estimating. Final pricing should reflect geotechnical reports, production assumptions, access limits, groundwater, casing needs, subcontractor quotes, and local market conditions.
The calculator uses a simple weight-per-length input. That approach is fast for estimating, but detailed bar schedules, lap lengths, cages, and splice requirements should be checked separately.
Use your expected installed cost per linear foot or meter of boring. That rate should reflect crew, equipment, productivity, site conditions, and ordinary setup factors.
Yes. After calculation, use the CSV button for spreadsheets and the PDF button for a clean report. Both export the visible result table shown above the form.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.