THE NUMBERS, EXPLAINED
How to use this calculator.
Return is before tax and fixed business overhead. Travel figures must be round trips and prices exclude discounts.
Start with your inputs
Enter round-trip travel minutes by zone, round-trip travel expense by zone (currency), lesson duration (minutes), desired return per total working hour (currency), other direct lesson expenses (currency). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Round-trip travel minutes by zone | 30,60 |
| Round-trip travel expense by zone (currency) | 5,10 |
| Lesson duration (minutes) | 60 |
| Desired return per total working hour (currency) | 30 |
| Other direct lesson expenses (currency) | 5 |
A worked example
With the example inputs above, minimum lesson price by zone (currency) is 55, 75. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Minimum lesson price by zone (currency) | 55, 75 |
| Total working minutes by zone | 90, 120 |
How this is calculated
Minimum lesson price by zone (currency)
Fund the target hourly return on lesson plus travel time and reimburse direct expenses.
Total working minutes by zone
Add lesson time to round-trip travel.
Symbols and units
- a
- Round-trip travel minutes by zone
- b
- Round-trip travel expense by zone (currency)
- c
- Lesson duration (minutes)
- d
- Desired return per total working hour (currency)
- e
- Other direct lesson expenses (currency)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
Return is before tax and fixed business overhead. Travel figures must be round trips and prices exclude discounts.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Minimum lesson price by zone (currency); Total working minutes by zone. The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Return is before tax and fixed business overhead. Travel figures must be round trips and prices exclude discounts.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Further reading
OpenStax: Describe and Identify Cost Drivers ↗
Background reading; this does not imply endorsement or independent review of SumFizz.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
Read the quality report →