Calculator inputs
Enter your best estimates. All fields accept decimals.
Example data table
Use this as a reference for typical inputs and outputs.
| Scenario | Annual Units | Current Price | New Price | One-time Costs | Risk % | Total Switching Cost |
|---|---|---|---|---|---|---|
| Component A - Local | 120,000 | 4.50 | 4.10 | 23,300 | 8 | 26,964 |
| Packaging B - Import | 300,000 | 0.80 | 0.74 | 41,500 | 12 | 46,480 |
| Machined Part C - Dual Source | 48,000 | 19.00 | 18.60 | 17,800 | 6 | 19,166 |
Formulas used
- Monthly volume = Annual volume ÷ 12
- Unit delta = New unit price − Current unit price
- Transition price impact = Unit delta × Monthly volume × Ramp-up months
- Internal labor cost = (Engineering + Quality + Procurement + IT hours) × Labor rate
- Downtime cost = Downtime hours × Downtime cost per hour
- One-time costs = Sum of fees + write-offs + labor + downtime
- Subtotal = One-time costs + Transition price impact
- Risk buffer = Subtotal × (Risk buffer % ÷ 100)
- Total switching cost = Subtotal + Risk buffer
- Monthly savings = max(0, (Current − New) × Monthly volume)
- Payback months = Total switching cost ÷ Monthly savings (if savings > 0)
How to use this calculator
- Enter your annual volume and both unit prices.
- Add realistic ramp-up months for transition pricing.
- Estimate one-time costs: tooling, qualification, audits, travel.
- Include internal hours, labor rate, downtime, and write-offs.
- Set a risk buffer based on quality and delivery uncertainty.
- Click Calculate to view totals and payback.
- Download CSV or PDF for sharing and approval workflows.
FAQs
1) What is supplier switching cost?
It is the total cost to move production from one supplier to another, including one-time transition work, temporary price impacts, and a risk allowance.
2) Why include a risk buffer?
Transitions often reveal hidden issues like quality escapes, expedite freight, or schedule slips. A buffer helps prevent underestimating the true changeover cost.
3) What should I put for ramp-up months?
Use the period where pricing, yields, or volumes are unstable. Include pilot builds, first articles, and the time until steady-state output is reached.
4) How does downtime affect the total?
If switching requires line changeovers, validations, or reprogramming, downtime can be expensive. The calculator multiplies downtime hours by your cost per hour.
5) Can this be used for dual-sourcing?
Yes. For partial switches, use the annual volume that will actually move to the new supplier and adjust one-time costs to match the reduced scope.
6) Why is payback shown as N/A sometimes?
Payback is only meaningful when the new unit price is lower than the current unit price. If there is no savings, the calculator avoids misleading results.
7) Is the PDF suitable for approvals?
It is a clean summary for reviews. For audits, attach supporting quotes, tooling invoices, and qualification plans so stakeholders can validate assumptions.