THE NUMBERS, EXPLAINED
How to use this calculator.
One cashback offer on eligible spend; threshold is tested before reward and cap is an absolute reward amount.
Start with your inputs
Enter eligible spend, cashback rate (%), reward cap, qualification threshold. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Eligible spend | 250 |
| Cashback rate (%) | 5 |
| Reward cap | 10 |
| Qualification threshold | 100 |
A worked example
With the example inputs above, reward earned is 10. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Reward earned | 10 |
| Effective eligible purchase cost | 240 |
| Spend at which cap is reached | 200 |
How this is calculated
Reward earned
Apply percentage reward only above threshold, limited by cap.
Effective eligible purchase cost
Subtract reward from eligible spend.
Spend at which cap is reached
Divide reward cap by reward rate and respect the qualification threshold; zero rate returns zero.
Symbols and units
- a
- Eligible spend
- b
- Cashback rate (%)
- c
- Reward cap
- d
- Qualification threshold
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
One cashback offer on eligible spend; threshold is tested before reward and cap is an absolute reward amount.
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?
Reward earned; Effective eligible purchase cost; Spend at which cap is reached. 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: One cashback offer on eligible spend; threshold is tested before reward and cap is an absolute reward amount.
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: Solve proportions and their applications ↗
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.
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