THE NUMBERS, EXPLAINED
How to use this calculator.
Steady-state expectation; one stamp per paid visit, no stamps on rewards and no stamp expiry.
Start with your inputs
Enter paid visits per customer per month, stamps needed for one reward, reward fulfillment cost (currency), expected redemption (%). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Paid visits per customer per month | 10 |
| Stamps needed for one reward | 5 |
| Reward fulfillment cost (currency) | 2 |
| Expected redemption (%) | 80 |
A worked example
With the example inputs above, rewards earned per customer-month is 2. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Rewards earned per customer-month | 2 |
| Expected reward cost per customer-month | 3.2 |
| Expected reward cost per paid visit | 0.32 |
How this is calculated
Rewards earned per customer-month
Divide paid visits by stamps required.
Expected reward cost per customer-month
Apply redemption probability and reward cost.
Expected reward cost per paid visit
Allocate expected redemption cost across earning visits.
Symbols and units
- a
- Paid visits per customer per month
- b
- Stamps needed for one reward
- c
- Reward fulfillment cost (currency)
- d
- Expected redemption (%)
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
Steady-state expectation; one stamp per paid visit, no stamps on rewards and no stamp expiry.
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?
Rewards earned per customer-month; Expected reward cost per customer-month; Expected reward cost per paid visit. 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: Steady-state expectation; one stamp per paid visit, no stamps on rewards and no stamp expiry.
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 →