THE NUMBERS, EXPLAINED
How to use this calculator.
Cohorts must have completed the same renewal observation window; pending renewals should be excluded.
Start with your inputs
Enter members due for renewal by cohort, members renewed by cohort. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Members due for renewal by cohort | 100,80 |
| Members renewed by cohort | 70,60 |
A worked example
With the example inputs above, renewal rates by cohort (%) is 70, 75. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Renewal rates by cohort (%) | 70, 75 |
| Lapsed members by cohort | 30, 20 |
| Overall renewal rate (%) | 72.222222 |
How this is calculated
Renewal rates by cohort (%)
Divide renewed members by members due in each cohort.
Lapsed members by cohort
Subtract renewals from each eligible cohort.
Overall renewal rate (%)
Weight cohort rates by members due.
Symbols and units
- a
- Members due for renewal by cohort
- b
- Members renewed 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
Cohorts must have completed the same renewal observation window; pending renewals should be excluded.
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?
Renewal rates by cohort (%); Lapsed members by cohort; Overall renewal rate (%). 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: Cohorts must have completed the same renewal observation window; pending renewals should be excluded.
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: Measures of the Center of the Data ↗
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 →