360 is the example result. Read it using the units and relationship stated below.
Subscription Cost uses monthly subscription, months, discount (%).
Separating growth, retention and subscription capacity
For subscription cost, the relationship is Result = [Monthly subscription] × [Months] × (1 − [Discount (%)] ÷ 100). The amount depends on the supplied monthly subscription, months, rather than a live market price or a value imported from another record. Recurring revenue should be compared across the same starting cohort. Expansion, contraction and churn change retention in different directions. Adding new customers to a retained-customer calculation can conceal losses in the original population.
Source and result record
For subscription cost, retain Monthly subscription, Months, Discount (%) together with the output. Record the date of the source values and the unit convention used in the form. That record separates a change in the underlying case from a change in how the information was entered. A saved result without its source values cannot show which assumption produced it.
Example with the supplied inputs
Monthly subscription: 30; Months: 12; Discount (%): 0. Result: 360. The values are illustrative.
Compare one changed input
Monthly subscription changes from 30 to 33. The result becomes 396. All other inputs remain fixed.
Calculation rule
Result = [Monthly subscription] × [Months] × (1 − [Discount (%)] ÷ 100)
Inputs and output
| Input | Example value | Entry convention |
|---|---|---|
| Monthly subscription | 30 | Use the source quantity represented by monthly subscription. Keep the counted population fixed and avoid mixing a unit value with a period total. |
| Months | 12 | Use the duration unit stated in months. A time period is not interchangeable with a currency amount or a count of events. |
| Discount (%) | 0 | Enter discount (%) on the percentage scale used in the formula (20 means 20%, not 0.20). Keep its base and reporting period consistent with the other inputs. |
Output: 360 is the example result. Read it using the units and relationship stated below. Use the formula to distinguish a cash amount, count, percentage or ratio.
How to use the page
Collect the inputs
Gather Monthly subscription, Months, Discount (%). Use one period and the units shown in the form.
Run the calculation
Enter the values and select the action. The calculation rule above explains how the inputs produce the result.
Compare a scenario
Change Monthly subscription on its own, keeping the other inputs fixed. Read both results before changing another assumption.
Worked example
With the example inputs listed above, the result is 360.
Change Monthly subscription from 30 to 33 while keeping every other value fixed. The result becomes 396. This comparison isolates that input; it does not forecast how other variables will respond.
Check the stated formula, units and limits before using the result in a decision.
Keep the displayed formula, input units and model scope with the result. Corrections or questions can be sent through the request section on this page.
Content updated: October 11, 2026