THE NUMBERS, EXPLAINED
How to use this calculator.
Account counts remain fixed and all accounts migrate on the supplied cohort schedule; no churn response or price-change permission is inferred.
Start with your inputs
Enter legacy accounts by cohort, legacy monthly price by cohort (currency), current monthly price by cohort (currency), months until migration by cohort. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Legacy accounts by cohort | 100,50 |
| Legacy monthly price by cohort (currency) | 10,15 |
| Current monthly price by cohort (currency) | 12,20 |
| Months until migration by cohort | 3,6 |
A worked example
With the example inputs above, monthly legacy discount exposure by cohort is 200, 250. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Monthly legacy discount exposure by cohort | 200, 250 |
| Exposure until planned migration (currency) | 2,100 |
| Monthly receipts after all migrations (currency) | 2,200 |
How this is calculated
Monthly legacy discount exposure by cohort
Compare current-price and legacy-price receipts at unchanged account counts.
Exposure until planned migration (currency)
Multiply monthly revenue differences by the supplied migration delay.
Monthly receipts after all migrations (currency)
Apply current prices to all accounts.
Symbols and units
- a
- Legacy accounts by cohort
- b
- Legacy monthly price by cohort (currency)
- c
- Current monthly price by cohort (currency)
- d
- Months until migration by cohort
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
Account counts remain fixed and all accounts migrate on the supplied cohort schedule; no churn response or price-change permission is inferred.
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?
Monthly legacy discount exposure by cohort; Exposure until planned migration (currency); Monthly receipts after all migrations (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: Account counts remain fixed and all accounts migrate on the supplied cohort schedule; no churn response or price-change permission is inferred.
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 →