THE NUMBERS, EXPLAINED
How to use this calculator.
Refilled slots recover the original service contribution in full. Lost contribution can be negative if fees exceed modeled losses.
Start with your inputs
Enter missed service bookings, cancelled slots refilled, average booked service price (currency), avoided consumables per unserved booking (currency), collected no-show fees in total (currency). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Missed service bookings | 20 |
| Cancelled slots refilled | 5 |
| Average booked service price (currency) | 60 |
| Avoided consumables per unserved booking (currency) | 10 |
| Collected no-show fees in total (currency) | 100 |
A worked example
With the example inputs above, unrecovered appointments is 15. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Unrecovered appointments | 15 |
| Contribution lost before fees | 750 |
| Net contribution lost after fees | 650 |
How this is calculated
Unrecovered appointments
Deduct refilled slots from missed bookings.
Contribution lost before fees
Value unfilled slots at service contribution.
Net contribution lost after fees
Offset lost contribution with collected fees.
Symbols and units
- a
- Missed service bookings
- b
- Cancelled slots refilled
- c
- Average booked service price (currency)
- d
- Avoided consumables per unserved booking (currency)
- e
- Collected no-show fees in total (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
Refilled slots recover the original service contribution in full. Lost contribution can be negative if fees exceed modeled losses.
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?
Unrecovered appointments; Contribution lost before fees; Net contribution lost after fees. 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: Refilled slots recover the original service contribution in full. Lost contribution can be negative if fees exceed modeled losses.
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 →