Vendor Migration Cost Calculator accuracy and testing

Formula source

• Total migration cost = onboarding + exit + internal labor + data migration + third-party services + overlap cost + downtime impact, then adjusted by the entered contingency percent.

Test cases

Known limitations

• This page documents the checked-in calculator logic and does not certify results for every real-world edge case.
• Use the result as a planning estimate unless the calculator page states a stricter purpose.

Assumptions

• Overlap cost assumes both vendors are paid during the parallel-run period.
• Downtime exposure is included only from the entered hours and hourly impact.
• All prices, fees, rates, and cost drivers are user-entered assumptions.
• Calculations are deterministic and run locally in your browser; Calwarden does not upload or store these inputs.

Unit handling

• New Vendor Onboarding accepts values in $.
• Old Vendor Exit Cost accepts values in $.
• Internal Migration Hours accepts values in hr.
• Internal Hourly Cost accepts values in $/hr.
• Data Migration Cost accepts values in $.
• Third-Party Services accepts values in $.
• Parallel Run Period accepts values in months.
• Old Vendor Monthly Cost accepts values in $/mo.
• New Vendor Monthly Cost accepts values in $/mo.
• Expected Downtime accepts values in hr.
• Downtime Cost accepts values in $/hr.
• Contingency accepts values in %.
• Total Migration Cost is displayed as currency.
• Internal Labor Cost is displayed as currency.
• Overlap Cost is displayed as currency.
• Downtime Impact is displayed as currency.

Rounding rules

• Number displays use up to 2 decimal places in the calculator UI.
• Currency outputs are displayed with standard US dollar formatting.
• Input precision follows configured step values where provided.

Version history

Change log