Estimated Cost Summary
| Cost category | Amount |
|---|---|
| Estimated total | $0.00 |
Formula Used
Total drilling cost = base drilling + equipment + labor + casing + consumables + fuel + mobilization + site work + permits + testing + disposal + custom costs + risk allowances + contingency + overhead + markup + insurance + profit + tax.
Base drilling cost = maximum of minimum charge or total depth × drilling rate × difficulty multiplier, plus any depth surcharge.
Estimated duration = total operating hours ÷ working hours per day.
How to Use This Calculator
- Choose the drilling type, method, currency, and project details.
- Enter depth, borehole count, drilling rate, and formation difficulty.
- Add equipment, labor, casing, fuel, site, permit, and testing costs.
- Set contingency, overhead, markup, insurance, profit, and tax percentages.
- Add custom costs, then review the cost summary and breakdown.
- Download the estimate as CSV or PDF when finished.
Drilling Cost Estimation Guide
A drilling cost estimate combines technical scope with local market pricing. Depth is often the first cost driver because deeper holes require more operating time, consumables, casing, and equipment wear. Formation conditions matter just as much. Loose soil can drill quickly, while hard rock may require slower penetration, specialized bits, higher fuel use, and more frequent maintenance.
Equipment and labor should be estimated from realistic operating hours. The calculator derives drilling time from total depth and drilling speed, then adds setup time and downtime. This helps connect hourly rig charges with crew costs. Casing can become a major expense when long intervals need steel, PVC, or stainless materials. Completion work such as grouting, development, testing, logging, and wellhead installation should also be included.
Mobilization costs vary with distance, site access, road conditions, and rig size. Remote projects may need additional trucks, temporary roads, leveling, fencing, water supply, or environmental controls. Permits and inspections can also differ widely by location. Waste handling deserves separate attention when drilling fluids, cuttings, or contaminated materials require controlled disposal.
Contingency is useful because subsurface conditions are uncertain before drilling begins. A percentage allowance can cover slower penetration, unexpected formations, damaged tools, weather delays, or additional casing. Overhead, contractor markup, insurance, profit, and tax should then be applied according to the commercial structure of the project.
Use the final cost as a planning figure rather than a guaranteed quote. Compare several scenarios by changing drilling speed, difficulty, depth, and contingency. Keep supplier quotations beside the estimate when pricing casing, fuel, and consumables. Record assumptions for transport distance, crew size, operating hours, and disposal requirements. This makes later revisions easier when field information improves or contractors provide updated rates.
For larger projects, compare a conservative case against an expected case. A conservative case can use slower drilling speeds, higher difficulty, and stronger contingency. This highlights the financial effect of subsurface uncertainty before work begins. Always confirm assumptions with experienced local drilling contractors first.
Example Drilling Cost Factors
| Factor | Example input | Typical effect |
|---|---|---|
| Depth | 500 ft | Higher depth increases time and materials. |
| Formation | Medium rock | Raises drilling difficulty and bit wear. |
| Rig rate | $280/hour | Directly affects equipment operating cost. |
| Casing | 300 ft PVC | Adds material and installation expense. |
| Contingency | 10% | Provides allowance for uncertain field conditions. |
Frequently Asked Questions
What is included in drilling cost?
A complete estimate can include drilling, labor, equipment, casing, fuel, mobilization, permits, testing, disposal, overhead, contingency, markup, and taxes.
How is cost per foot or meter calculated?
The calculator divides the final project total by the combined drilled depth for all boreholes.
Why use a difficulty multiplier?
It adjusts the base drilling rate for challenging geology, slower penetration, and additional wear.
Should mobilization be included?
Yes. Moving rigs, compressors, support vehicles, and crews can represent a meaningful project expense.
How much contingency should I use?
The correct allowance depends on geological uncertainty, site access, project complexity, and contract risk.
Can I estimate several boreholes?
Yes. Enter the borehole count and the tool multiplies depth, casing, setup time, and relevant drilling calculations.
Can I compare estimated and actual costs?
Yes. Enter the actual project cost to display the variance against the current estimate.
Are CSV and PDF files included?
Yes. The download buttons export the current project details and calculated cost breakdown.