THE NUMBERS, EXPLAINED
How to use this calculator.
Assumes the listed repair is approved. Credit is capped at repair charges and no refund of unused credit is modeled.
Start with your inputs
Enter diagnostic fee (currency), approved repair labour (currency), approved repair parts (currency), diagnostic fee credit toward repair (%), diagnostic fee already paid (currency). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Diagnostic fee (currency) | 60 |
| Approved repair labour (currency) | 120 |
| Approved repair parts (currency) | 80 |
| Diagnostic fee credit toward repair (%) | 100 |
| Diagnostic fee already paid (currency) | 60 |
A worked example
With the example inputs above, diagnostic credit (currency) is 60. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Diagnostic credit (currency) | 60 |
| Total customer charge (currency) | 200 |
| Outstanding customer balance (currency) | 140 |
How this is calculated
Diagnostic credit (currency)
Apply supplied credit percentage capped at approved repair value.
Total customer charge (currency)
Add diagnostics and repair, then deduct the credit.
Outstanding customer balance (currency)
Deduct diagnostic payment already received.
Symbols and units
- a
- Diagnostic fee (currency)
- b
- Approved repair labour (currency)
- c
- Approved repair parts (currency)
- d
- Diagnostic fee credit toward repair (%)
- e
- Diagnostic fee already paid (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
Assumes the listed repair is approved. Credit is capped at repair charges and no refund of unused credit is modeled.
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?
Diagnostic credit (currency); Total customer charge (currency); Outstanding customer balance (currency). 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: Assumes the listed repair is approved. Credit is capped at repair charges and no refund of unused credit is modeled.
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 →