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THE SUMFIZZ LIBRARY

Subscription product operations calculators

Explore 18 free tools for subscription product operations. Find subscription cohort payback curve, subscription deferred revenue schedule, subscription grandfathered price exposure and more. Each calculator explains its inputs and method, with examples you can try using your own numbers.

THE SUMFIZZ LIBRARY

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18 calculators

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Subscription cohort payback curve

Observed whole-month payback, no interpolation or future forecast.

Subscription product operations

Subscription deferred revenue schedule

Even recognition across equal complete service periods is an explicit supplied convention.

Subscription product operations

Subscription grandfathered price exposure

Account counts remain fixed and all accounts migrate on the supplied cohort schedule; no churn response or price-change permission is inferred.

Subscription product operations

Subscription plan migration proration

Actual-day proration with identical included/excluded day convention for old and new plans.

Subscription product operations

Subscription usage tier invoice

Two marginal tiers, not an all-units volume discount.

Subscription product operations

Subscription seat true-up

Segments partition one full billing cycle without overlaps or gaps.

Subscription product operations

Subscription dunning recovery cohorts

Recovery is measured by money, not customer count.

Subscription product operations

Subscription credit note allocation

Input order is the supplied application priority; credit cannot be applied beyond an invoice balance.

Subscription product operations

Subscription contraction attribution

Mutually exclusive reason per account; supplied cohort can be filtered before entry.

Subscription product operations

Subscription expansion attribution

Exact sequential bridge: change seats first at old price, then price across ending seats, then usage.

Subscription product operations

Subscription coupon liability

All redeeming accounts retain the plan for the full coupon term.

Subscription product operations

Subscription committed-use shortfall

Take-or-pay commitment with no rollover or refund.

Subscription product operations

Subscription cancellation save-offer economics

Assumes the account would otherwise contribute nothing and the recurring offer lasts through all retained months.

Subscription product operations

Subscription reactivation cohort value

Observed period value, not lifetime value or proof that the offer caused reactivation.

Subscription product operations

Subscription billing error reconciliation

Positive adjustments add charges and negative adjustments are credits.

Subscription product operations

Subscription support allocation by plan

One plan per ticket/account and one reporting period.

Subscription product operations

Subscription minimum-commitment exit

Illustrates supplied settlement rules only; excess prepayment is a remaining balance, not a determination of refund entitlement.

Subscription product operations

Subscription renewal workload calendar

Weeks are listed in chronological order, all incoming reviews are due within their week and oldest backlog is cleared first.

Subscription product operations