Calculator Inputs
Large screens show three columns, medium screens show two, and mobile shows one.
Example Data Table
| Component | Part No. | Category | Supplier | Qty/Unit | Unit Cost | Scrap % | Setup Cost |
|---|---|---|---|---|---|---|---|
| Steel Bracket | SB-110 | Fabricated Part | Prime Metals | 2.0000 | 4.8000 | 3.0000 | 35.00 |
| Fastener Kit | FK-204 | Hardware | Fixwell Supply | 1.0000 | 2.3500 | 1.5000 | 12.00 |
| Polymer Cover | PC-330 | Molded Part | Moldex | 1.0000 | 6.4000 | 4.2000 | 28.00 |
| Printed Label | PL-080 | Packaging | MarkPrint | 1.0000 | 0.4200 | 2.0000 | 5.00 |
Use these sample rows with a production quantity of 100 units to test the calculator quickly.
Formula Used
Base quantity per component
Base Quantity = Planned Production Quantity × Quantity Per Finished Unit
Required purchase quantity
Required Quantity = Base Quantity × (1 + Scrap % ÷ 100)
Material cost per component
Material Cost = Required Quantity × Unit Cost
Extended component cost
Extended Cost = Material Cost + Setup or Tooling Cost
Material cost per finished unit
Material Cost Per Unit = Total Extended Material Cost ÷ Planned Production Quantity
Conversion cost per finished unit
Conversion Cost = Labor + Machine + Quality + Packaging + Logistics
Total unit cost
Total Unit Cost = (Material + Conversion) + Overhead + Contingency
Selling price estimate
Selling Price Per Unit = Total Unit Cost ÷ (1 - Target Margin % ÷ 100)
How to Use This Calculator
- Enter the planned production quantity and currency.
- Fill in conversion costs such as labor, machine, quality, packaging, and logistics.
- Set overhead, contingency, and optional target margin percentages.
- Add each BOM item with quantity per unit, unit cost, scrap percentage, and setup cost.
- Click Calculate BOM Cost to place the results above the form.
- Review summary cards, the detailed component table, and the cost graph.
- Download the calculation as CSV or PDF for quoting, budgeting, or sourcing reviews.
FAQs
1. What does this calculator estimate?
It estimates total BOM cost for a production batch and a single finished unit. It also separates material, scrap, setup, overhead, contingency, and conversion costs for clearer manufacturing decisions.
2. Why is scrap included in required quantity?
Scrap increases the amount you must purchase or consume to achieve the planned output. Including it makes the estimate more realistic for cutting losses, rejects, trimming, and startup waste.
3. What is setup cost in the calculator?
Setup cost captures one-time charges linked to the component or batch, such as tooling preparation, programming, fixture setup, or minimum lot handling. The calculator adds it directly to extended component cost.
4. Can I use this for prototype runs?
Yes. Small prototype batches often have high setup and scrap impact. Enter the real batch size and fixed charges to see how prototype economics differ from repeat production.
5. How is overhead applied?
Overhead is applied as a percentage of material plus conversion cost per unit. This helps model indirect expenses such as supervision, utilities, plant support, software, and facility burden.
6. Why add contingency on top of overhead?
Contingency creates a planning buffer for volatility, supplier changes, unplanned scrap, or rounding gaps. It is useful when costs are uncertain, especially early in sourcing or design revisions.
7. What does suggested selling price mean?
It is the unit price needed to achieve the target gross margin you entered. It is a planning figure, not a final quote, because freight terms, discounts, and taxes may differ.
8. Can I export the analysis?
Yes. After calculation, use the CSV button for spreadsheet work or the PDF button for a shareable report. Both options capture the summary and component-level breakdown.