Support Plan Cost Calculator accuracy and testing

Formula source

• Monthly support cost = max(0, (base fee + seats * support cost per seat + max(0, expected hours - included hours) * extra-hour rate + escalation fees) * (1 - discount percent) - monthly credits).

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

• Credits are treated as monthly credits against support cost and the result is floored at zero.
• Annual cost assumes the monthly support pattern repeats for 12 months.
• 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

• Base Monthly Fee accepts values in $/mo.
• Covered Seats accepts numeric values.
• Support Cost per Seat accepts values in $/seat-mo.
• Expected Support Hours accepts values in hr/mo.
• Included Support Hours accepts values in hr/mo.
• Extra Hour Rate accepts values in $/hr.
• Escalation Fees accepts values in $/mo.
• Discount accepts values in %.
• Monthly Credits accepts values in $/mo.
• Monthly Support Cost is displayed as currency.
• Annual Support Cost is displayed as currency.
• Extra Support Cost is displayed as currency.
• Gross 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