With the illustrative inputs below, the result is 1,500 .
Try this with your own numbersFormula and worked example
Additional contribution = starting customers × (old churn − new churn) × contribution
| Input | Example |
|---|---|
| Starting customer cohort | 500 |
| Current period churn | 8 % |
| Scenario period churn | 5 % |
| Next-period contribution per retained customer | 100 |
| Calculated result | 1,500 |
Choose reliable inputs
Plan materials, travel and crew time before committing to a price. For this appliance repair calculation, use a completed job sheet, supplier quotes and a crew schedule and a consistent definition of one repair visit.
- Diagnostics: include the portion belonging to this repair visit or reporting period, and record where the value came from.
- Replacement parts: include the portion belonging to this repair visit or reporting period, and record where the value came from.
- Repeat trips: include the portion belonging to this repair visit 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.
Can I count lifetime value as immediate cash?
No. This tool uses one-period contribution. Future retained spending should be modeled over its own timing.
Uses a fixed starting cohort and one following contribution period; improvement is not guaranteed.
What if this input changes?
If starting customer cohort rises by 10%, this example changes by 150 . 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.