In this example, increasing original selling price from 100 to 110 changes the result from 134 sales to 129 sales. All other inputs stay the same.
Try this with your own numbersFormula and worked example
Required sales = ceiling(original contribution / discounted unit contribution)
| Input | Example |
|---|---|
| Original selling price | 100 |
| Variable cost per sale | 60 |
| Price discount | 10 % |
| Original sales volume | 100 |
| Calculated result | 134 sales |
Choose reliable inputs
Account for delivery time, review work and when you expect to be paid for each engagement. For this real estate agency calculation, use time sheets, engagement scopes and invoice ageing and a consistent definition of one completed sale.
- Marketing: include the portion belonging to this completed sale or reporting period, and record where the value came from.
- Agent time: include the portion belonging to this completed sale or reporting period, and record where the value came from.
- Transaction support: include the portion belonging to this completed sale 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.
Will a 10% discount need only 10% more sales?
Use contribution after variable cost. The discounted price must still exceed variable cost.
What if this input changes?
If original selling price rises by 10%, this example changes by -5 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.