Total Cost of Ownership Calculator accuracy and testing

Formula source

• Total ownership cost = upfront cost + sum of annualized recurring costs grown by the entered annual growth rate for the analysis period + exit cost.

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

• Recurring monthly costs are treated as steady within each year, then escalated annually.
• Taxes, rebates, one-off credits, and financing effects are included only if you enter them in a cost field.
• 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

• Upfront Cost accepts values in $.
• Monthly Subscription accepts values in $/mo.
• Monthly Support Cost accepts values in $/mo.
• Monthly Usage Cost accepts values in $/mo.
• Monthly Internal Admin Cost accepts values in $/mo.
• Analysis Period accepts values in years.
• Annual Cost Growth accepts values in %.
• Exit or Migration Cost accepts values in $.
• Total Ownership Cost is displayed as currency.
• Recurring Cost Total is displayed as currency.
• Average Annual Cost is displayed as currency.
• Average Monthly Cost 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