Calculator Inputs
Formula Used
The calculator separates one-time setup costs from duration-based recurring costs, then applies contingency and tax.
Fixed Subtotal = Sum of all one-time mobilization inputs
Monthly Subtotal = Site Office Monthly + Storage Monthly + Utilities Monthly + Security Monthly + Miscellaneous Monthly
Recurring Total = Monthly Subtotal × Mobilization Months
Base Mobilization Cost = Fixed Subtotal + Recurring Total
Contingency Amount = Base Mobilization Cost × (Contingency % ÷ 100)
Pre-Tax Total = Base Mobilization Cost + Contingency Amount
Tax Amount = Pre-Tax Total × (Tax % ÷ 100)
Grand Total = Pre-Tax Total + Tax Amount
Mobilization % of Project = (Grand Total ÷ Project Value) × 100
Cost Per Month = Grand Total ÷ Mobilization Months
How to Use This Calculator
- Choose the currency and enter the total project value.
- Enter the expected mobilization duration in months.
- Fill in one-time setup costs such as permits, fencing, office setup, transport, insurance, welfare, and access works.
- Add recurring monthly costs such as security, utilities, storage, and office operation.
- Enter contingency and tax percentages for a loaded mobilization budget.
- Click the calculation button to display results above the form.
- Review the detailed breakdown table and Plotly graph.
- Use the CSV and PDF buttons to export the results for reports, approvals, or internal planning.
Example Data Table
| Item | Example Value | Type | Comment |
|---|---|---|---|
| Project Value | 500,000 | Project Benchmark | Total contract value used for comparison. |
| Mobilization Duration | 3 months | Time Input | Used to scale recurring monthly costs. |
| Site Office Setup | 12,000 | Fixed | Cabins, furniture, networking, and setup labor. |
| Utilities Monthly | 1,200 | Recurring | Power, water, fuel, and service charges. |
| Equipment Transport | 9,000 | Fixed | Haulage, loading, unloading, and escort costs. |
| Contingency | 10% | Allowance | Covers uncertainty and startup overruns. |
FAQs
1. What is project mobilization cost?
It is the cost of preparing a project site before full production begins. It commonly includes setup, transport, permits, utilities, temporary facilities, safety, staffing, and early operational expenses.
2. Why separate fixed and recurring mobilization costs?
Fixed costs happen once, while recurring costs continue over the mobilization period. Splitting them improves estimating accuracy and shows how schedule changes affect the startup budget.
3. What should be included in contingency?
Contingency usually covers uncertainty, short-duration overruns, minor scope changes, urgent procurement, and price variation. It should not replace clearly known costs that can already be estimated directly.
4. How do monthly costs influence mobilization totals?
Monthly costs are multiplied by the mobilization duration. A longer preconstruction period can increase site office, utilities, security, storage, and other operating expenses quickly.
5. Can I use this calculator for small and large sites?
Yes. The calculator works for many project sizes because every major cost line is entered directly. You can keep values simple for small jobs or detailed for major mobilizations.
6. Should tax be applied before or after contingency?
Many teams calculate tax on the subtotal after contingency, because contingency becomes part of the expected budgeted amount. Still, local accounting practice may differ, so confirm internal rules.
7. What if project value is unknown?
You can still estimate mobilization totals without it. The project value field mainly helps compare mobilization as a percentage of the full contract or target budget.
8. Why export to CSV or PDF?
Exports make it easier to share results with estimators, project managers, procurement teams, and clients. CSV suits spreadsheets, while PDF is useful for formal review and approval packs.