Editorial methods

A useful metric explanation makes its inputs, assumptions, and limits visible. This page describes the conventions used across our guides and calculators.

Sources and original examples

Our detailed guides link to primary explanations from subscription analytics providers, payment platforms, investors, and operators. A source note explains what each reference supports. Linking to a source does not imply its author reviewed or endorsed this site.

We write separate hypothetical scenarios to show how the methods work. These are labeled on the page. We do not present generated figures as research, customer outcomes, or surveyed benchmarks.

Preparation and use of AI

This content release was drafted and implemented with AI assistance, using the linked references to check methods. Automated tests check calculator behavior, publication structure, and internal links. Those checks do not amount to an independent expert review. 4NLab is the publisher and the contact for corrections.

Calculation conventions

• Recurring revenue is normalized to a consistent period. Contract value, cash receipts, and recognized revenue are separate measures.
• Retention calculations use the same opening customer cohort. Revenue from newly acquired customers is excluded.
• The simple LTV calculator estimates revenue lifetime value under constant churn. Gross-profit comparisons require a margin adjustment.
• CAC payback uses monthly gross profit per account. Magic Number uses annualized quarterly revenue change divided by prior-quarter sales and marketing expense.
• Currency symbols in the tools are presentation labels. Inputs must use one currency; the calculators do not convert currencies.

Benchmarks and comparisons

We do not assign universal “good” or “great” ratings to calculator results. Stage, customer segment, contract duration, measurement period, and accounting definitions affect comparability. Historic rules of thumb are described as heuristics. Valuation examples use assumed multiples, not live market quotes.

What gets a full guide

Standalone guides include a method, a worked scenario, interpretation, cautions, questions, and references. Short definitions stay together in the glossary. Comparisons need specific differences and decision guidance. The updated date identifies the most recent substantive content revision; it is not refreshed merely because the site is rebuilt.

Corrections and maintenance

To report a problem, send the page URL, the disputed statement or calculation, and a supporting source to info@4nlab.com. For calculator errors, use fictional sample inputs that reproduce the result. Do not send customer records or confidential company figures.

The current revision, dated September 29, 2026, consolidates short entries, adds sourced guides and scenarios, removes unsupported benchmark ratings, and corrects the Magic Number formula. Future material corrections should update the affected guide's date and explanation.