THE NUMBERS, EXPLAINED
How to use this calculator.
Cancellation fee is collected only when a slot remains unfilled; refilled bookings have the same contribution as the original service.
Start with your inputs
Enter canceled service slots, probability of refilling each slot (%), replacement service price (currency), variable cost of delivered service (currency), cancellation fee per unfilled slot (currency). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Canceled service slots | 10 |
| Probability of refilling each slot (%) | 60 |
| Replacement service price (currency) | 100 |
| Variable cost of delivered service (currency) | 30 |
| Cancellation fee per unfilled slot (currency) | 20 |
A worked example
With the example inputs above, expected replacement bookings is 6. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Expected replacement bookings | 6 |
| Expected recovered contribution (currency) | 500 |
| Unrecovered contribution versus full service (currency) | 200 |
How this is calculated
Expected replacement bookings
Multiply cancellations by assumed refill probability.
Expected recovered contribution (currency)
Weight replacement contribution and fees on unfilled slots.
Unrecovered contribution versus full service (currency)
Compare recovery with contribution if all original services occurred.
Symbols and units
- a
- Canceled service slots
- b
- Probability of refilling each slot (%)
- c
- Replacement service price (currency)
- d
- Variable cost of delivered service (currency)
- e
- Cancellation fee per unfilled slot (currency)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
Cancellation fee is collected only when a slot remains unfilled; refilled bookings have the same contribution as the original service.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Expected replacement bookings; Expected recovered contribution (currency); Unrecovered contribution versus full service (currency). The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Cancellation fee is collected only when a slot remains unfilled; refilled bookings have the same contribution as the original service.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Further reading
OpenStax: Describe and Identify Cost Drivers ↗
Background reading; this does not imply endorsement or independent review of SumFizz.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
Read the quality report →