With the illustrative inputs below, the result is 900 per month.
Try this with your own numbersFormula and worked example
Potential contribution = missed enquiries × recoverable share × close rate × contribution per sale
| Input | Example |
|---|---|
| Missed enquiries per month | 40 |
| Recoverable share | 30 % |
| Recovered enquiry close rate | 25 % |
| Contribution per sale | 300 |
| Calculated result | 900 per month |
Choose reliable inputs
Include software licences, delivery time, revisions and ongoing support when costing a project. For this web design calculation, use project time logs, licence invoices and retainer scopes and a consistent definition of one project.
- Design hours: include the portion belonging to this project or reporting period, and record where the value came from.
- Development: include the portion belonging to this project or reporting period, and record where the value came from.
- Revisions: include the portion belonging to this project 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.
Does every missed call represent a lost sale?
Some callers are duplicates, existing customers, or poor fits. Use unique qualified enquiries and a measured conversion rate.
Recovery and conversion rates are hypothetical unless measured; do not treat this as guaranteed revenue.
What if this input changes?
If missed enquiries per month rises by 10%, this example changes by 90 per month. 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.