Visible formulas
Every calculator shows its inputs, formula and result labels. You can replace defaults with figures from your own billing, payroll and infrastructure records.
Metric definitions
SaaS metrics vary by accounting policy and cohort window. Read the assumptions beside the calculator and keep the same definitions across periods.
- Revenue figures should use a consistent recognition basis.
- Churn and retention need the same cohort and time window.
- Cost and margin results are estimates until reconciled to actual books.
Testing and release process
Each calculation function is tested independently from the interface with normal, zero and boundary cases. A production release must pass type validation, the regression suite and a static build before representative English and Chinese pages are inspected at desktop and mobile widths.
Worked examples explain an operating decision and do not present sample defaults as industry benchmarks. Substantive editorial or formula changes receive a new visible review date.
Metric monitoring and limitations
SaaS formulas are monitored through tests and source review rather than automatic publication. External documentation changes create a review task; they do not silently rewrite a metric definition. Billing configuration, contracts and accounting policies remain account-specific and cannot be discovered by a public monitor.
Corrections
Send the tool URL, inputs, expected result and source when reporting an issue. Confirmed changes receive a new review date and a regression test.
Last reviewed: July 30, 2026