The unit contribution must be positive. Check whether delivery capacity can support the resulting volume.
Try this with your own numbersFormula and worked example
Required volume = ceiling((fixed costs + target profit) / unit contribution)
| Input | Example |
|---|---|
| Period fixed costs | 8,000 |
| Target operating profit | 4,000 |
| Revenue per appointment | 500 |
| Variable cost per appointment | 300 |
| Calculated result | 60 sales |
Choose reliable inputs
Allow time for preparation, the service itself and cleaning up before the next appointment. For this veterinary practice calculation, use appointment history, service durations and supply costs and a consistent definition of one appointment.
- Staff time: include the portion belonging to this appointment or reporting period, and record where the value came from.
- Supplies: include the portion belonging to this appointment or reporting period, and record where the value came from.
- Facility overhead: include the portion belonging to this appointment or reporting period, and record where the value came from.
Use the same currency for every money input. Do not mix weekly costs with monthly revenue, or count the same expense in both an itemised cost and allocated overhead.
How many sales are needed beyond break-even?
The unit contribution must be positive. Check whether delivery capacity can support the resulting volume.
What if this input changes?
If period fixed costs rises by 10%, this example changes by 4 sales. This shows the effect of one change; it does not predict what will happen.
Open the calculator, save your baseline, then change the input supported by the least reliable estimate in your records. Compare both scenarios before committing to a price or capacity promise.