Driving school Error Prevention Break-Even
Errors to prevent = ceiling(prevention cost / cost per error)
Gather attendance records, teaching schedules and room costs. Include instructor hours, fuel, and vehicle wear. The starting figures are examples. Replace them with your own records.
Formula and worked example
Errors to prevent = ceiling(prevention cost / cost per error)
| Input | Example |
|---|---|
| Monthly prevention cost | 500 |
| Fully assigned cost per avoidable error | 125 |
| Calculated result | 4 errors per month |
Choose reliable inputs
Connect teaching time, preparation, attendance and room capacity to each lesson or class. For this driving school calculation, use attendance records, teaching schedules and room costs and a consistent definition of one lesson.
- Instructor hours: include the portion belonging to this lesson or reporting period, and record where the value came from.
- Fuel: include the portion belonging to this lesson or reporting period, and record where the value came from.
- Vehicle wear: include the portion belonging to this lesson 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 errors must quality control prevent to pay?
Use avoidable cash or capacity costs. Do not count theoretical opportunity revenue as collected revenue.
What if this input changes?
If monthly prevention cost rises by 10%, this example changes by 1 errors 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.