Calwarden

Vendor Migration Cost Calculator

Estimate the cost to migrate from one vendor to another using transition, labor, data, overlap, and downtime assumptions.

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Inputs

$
$
hr
$/hr
months

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Results

Total Migration Cost
Internal Labor Cost$24,700.00
Overlap Cost$30,000.00
Downtime Impact$12,000.00

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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.

Sensitivity preview

New Vendor Onboarding -10%: Total Migration Cost $128,370.00

New Vendor Onboarding Current: Total Migration Cost $130,570.00

New Vendor Onboarding +10%: Total Migration Cost $132,770.00

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

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About this Vendor Migration Cost Calculator

Vendor migration costs include more than a new subscription. Transition work, data migration, overlap months, staff time, downtime risk, and exit assistance all affect the switching case.

Who this calculator is for

  • Procurement teams evaluating whether switching vendors is worth it.
  • IT teams planning migration effort and cutover risk.
  • Finance teams modeling transition costs in savings cases.

When to use it

  • Estimate the one-time cost to leave a vendor and onboard a replacement.
  • Model overlapping subscriptions during parallel run.
  • Include downtime or productivity exposure in a migration business case.

How to use this calculator

  1. Enter new-vendor onboarding and old-vendor exit costs.
  2. Add internal migration labor, data migration, and third-party help.
  3. Enter overlap months and monthly costs for old and new vendors.
  4. Add estimated downtime exposure and contingency.

Key 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.

Accuracy and testing

Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.

View accuracy page

How this calculator works

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

Inputs explained

Onboarding and exit costs

Fees or services needed to start with the new vendor and leave the current vendor.

Migration labor

Internal hours multiplied by the entered hourly cost.

Overlap cost

Parallel run months multiplied by old and new monthly costs.

Downtime exposure

Expected downtime hours multiplied by your entered hourly impact.

Understanding your results

The primary result is the estimated migration cost before considering future savings. Compare it with expected savings or service improvements over the replacement period.

Example scenarios

ERP vendor switch

$20,000 onboarding, $8,000 exit services, 260 internal hours at $95/hour, $18,000 data migration, 2 overlap months at $15,000 combined monthly cost, and 10% contingency create a realistic switching-cost estimate.

Low-risk SaaS transition

If there is no downtime and only one overlap month, migration cost may be dominated by labor and data cleanup rather than vendor fees.

Key Features

  • Instant Calculation
  • Private & Secure
  • Mobile Optimized

Tips & Best Practices

  • Model an optimistic and conservative cutover scenario.
  • Ask vendors to separate export, archive, implementation, and support costs.
  • Use this result in TCO so switching costs are included in the full lifecycle view.

Frequently Asked Questions

Does this calculate future savings?
No. It estimates transition cost. Compare the result with expected savings in a separate ROI or TCO scenario.
Should I include overlapping subscriptions?
Yes, when the old and new vendors must both run during migration, validation, or user training.
Are my vendor costs stored or sent anywhere?
No. The calculation runs locally in your browser and uses only the values you enter.