With the illustrative inputs below, the result is 714.2857 . Delivery cost 400; allocated overhead 100; commission 35.7143; retained contribution after assigned costs 178.5714.
Try this with your own numbersFormula and worked example
Quote = (itemised delivery costs + allocated overhead) ÷ (1 − margin − commission)
| Input | Example |
|---|---|
| Parts cost | 200 |
| Travel cost | 150 |
| Diagnostic time cost | 50 |
| Fixed overhead allocated to this repair visit | 100 |
| Target margin after commission | 25 % |
| Selling-price commission | 5 % |
| Calculated result | 714.2857 |
Delivery cost 400; allocated overhead 100; commission 35.7143; retained contribution after assigned costs 178.5714.
Choose reliable inputs
Separate parts, technician time and bay availability for each repair order. For this mobile mechanic calculation, use repair orders, parts invoices and technician time logs and a consistent definition of one repair visit.
- Parts: include the portion belonging to this repair visit or reporting period, and record where the value came from.
- Travel: include the portion belonging to this repair visit or reporting period, and record where the value came from.
- Diagnostic time: 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.
How should commission change my quote?
Adding a commission percentage to cost does not preserve the target margin. Commission is based on the selling price.
Allocate overhead once; target margin and commission together must be below 100%.
What if this input changes?
If parts cost rises by 10%, this example changes by 28.5714 . 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.