THE NUMBERS, EXPLAINED
How to use this calculator.
Exact sequential bridge: change seats first at old price, then price across ending seats, then usage. Components may be negative; no interaction is double counted.
Start with your inputs
Enter beginning paid seats, ending paid seats, beginning recurring price per seat (currency), ending recurring price per seat (currency), beginning recurring usage charge (currency), ending recurring usage charge (currency). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Beginning paid seats | 10 |
| Ending paid seats | 12 |
| Beginning recurring price per seat (currency) | 20 |
| Ending recurring price per seat (currency) | 25 |
| Beginning recurring usage charge (currency) | 100 |
| Ending recurring usage charge (currency) | 150 |
A worked example
With the example inputs above, seat-count contribution to revenue change is 40. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Seat-count contribution to revenue change | 40 |
| Plan-price contribution to revenue change | 60 |
| Usage contribution to revenue change | 50 |
| Total recurring-revenue change (currency) | 150 |
How this is calculated
Seat-count contribution to revenue change
Value seat changes at the beginning seat price.
Plan-price contribution to revenue change
Value price changes across ending seats, allocating interaction here.
Usage contribution to revenue change
Subtract beginning usage revenue from ending usage revenue.
Total recurring-revenue change (currency)
Reconcile the three components to actual revenue change.
Symbols and units
- a
- Beginning paid seats
- b
- Ending paid seats
- c
- Beginning recurring price per seat (currency)
- d
- Ending recurring price per seat (currency)
- e
- Beginning recurring usage charge (currency)
- f
- Ending recurring usage charge (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
Exact sequential bridge: change seats first at old price, then price across ending seats, then usage. Components may be negative; no interaction is double counted.
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?
Seat-count contribution to revenue change; Plan-price contribution to revenue change; Usage contribution to revenue change; Total recurring-revenue change (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: Exact sequential bridge: change seats first at old price, then price across ending seats, then usage. Components may be negative; no interaction is double counted.
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.
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