THE NUMBERS, EXPLAINED
How to use this calculator.
Observed period value, not lifetime value or proof that the offer caused reactivation. Other costs belong in support or offer inputs only if defined consistently.
Start with your inputs
Enter reactivated accounts by cohort, observed cohort receipts (currency), cohort support costs (currency), cohort reactivation offer costs (currency). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Reactivated accounts by cohort | 10,20 |
| Observed cohort receipts (currency) | 1000,1600 |
| Cohort support costs (currency) | 100,300 |
| Cohort reactivation offer costs (currency) | 200,400 |
A worked example
With the example inputs above, observed net value by cohort (currency) is 700, 900. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Observed net value by cohort (currency) | 700, 900 |
| Net value per reactivated account by cohort | 70, 45 |
| Combined net cohort value (currency) | 1,600 |
How this is calculated
Observed net value by cohort (currency)
Deduct measured support and offer costs from receipts.
Net value per reactivated account by cohort
Divide net cohort value by reactivated account count.
Combined net cohort value (currency)
Aggregate all observed net values.
Symbols and units
- a
- Reactivated accounts by cohort
- b
- Observed cohort receipts (currency)
- c
- Cohort support costs (currency)
- d
- Cohort reactivation offer costs (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
Observed period value, not lifetime value or proof that the offer caused reactivation. Other costs belong in support or offer inputs only if defined consistently.
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?
Observed net value by cohort (currency); Net value per reactivated account by cohort; Combined net cohort value (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: Observed period value, not lifetime value or proof that the offer caused reactivation. Other costs belong in support or offer inputs only if defined consistently.
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 →