Editorial standards

How we source data

Every number in a PennyCheck calculator comes from a primary source that you can verify yourself. We use three categories of sources:

• Government databases: State court fee schedules, IRS tax tables and revenue procedures, CMS Medicare provider data, state Department of Revenue publications, and Bureau of Labor Statistics wage data.
• Industry reports: Clio Legal Trends Report for attorney rates, National Association of Realtors housing data, and professional association surveys with documented methodology.
• State-specific statutes: Property division laws, residency requirements, waiting periods, and fault/no-fault grounds are cited with specific statute numbers (e.g., Cal. Fam. Code § 2550, Ohio Rev. Code § 3105.171).

Verification process

Before any tool goes live, it passes through a multi-stage verification process:

1. Source verification: Every source URL is checked for liveness and relevance. Homepage-level links are rejected — sources must point to the specific data page (e.g., a court's fee schedule, not the court's homepage).
2. Formula validation: Each calculator's formula is tested with at least 3 test cases covering different input combinations. Expected outputs are computed independently and compared within a 5% tolerance.
3. Automated quality gate: Every tool passes 18+ automated checks including schema validation, content depth (1,500+ words of editorial per tool), SEO requirements, source verification, and duplicate detection.
4. Cross-tool uniqueness: State-variant tools (e.g., divorce cost by state) are checked for description uniqueness (<80% overlap with sibling tools) and content differentiation. Each state page has content specific to that state's legal landscape.
5. Freshness monitoring: Each tool displays a “Data verified” date. Our automated health check flags tools with data older than 12 months for re-verification. Different data types have different freshness requirements: tax brackets are verified annually after legislative sessions, mortgage rates weekly, filing fees annually.

Calculation methodology

Each tool page includes a “Methodology” section explaining exactly how the estimate is computed — which formula is used, what assumptions are made, and where the ranges come from. We believe transparency about methodology is as important as accuracy of results.

All computation happens in your browser using deterministic formulas. No AI or machine learning is used in the calculation itself — the same inputs always produce the same outputs. We use the expr-eval library for safe mathematical expression evaluation.

Cost ranges (low to high) account for geographic variation within a state, case complexity, and market fluctuations. The range multipliers are calibrated per state based on cost-of-living data — a divorce in Mississippi uses different range assumptions than one in California.

What our calculators don't do

PennyCheck calculators provide estimates based on publicly available data and standard formulas. They are not a substitute for professional advice. Specifically:

• Estimates are based on averages and ranges — your actual costs may differ based on your specific circumstances.
• Legal calculators do not constitute legal advice. Consult a licensed attorney in your state for legal guidance.
• Financial calculators are for informational purposes and do not constitute financial advice. Consult a certified financial planner (CFP) or CPA for personalized recommendations.
• Tax calculations use current-year brackets and rates — tax law changes may affect future results.

Editorial review

PennyCheck's methodology and data standards are designed to meet the highest accuracy requirements for financial and legal information. Each calculator's methodology — the formulas, assumptions, data sources, and range calibrations — is documented and available for review on the tool page itself.

We are committed to having our methodology independently reviewed by credentialed professionals. If you are a licensed attorney (JD), certified financial planner (CFP), or certified public accountant (CPA) interested in reviewing our methodology, please contact us.

Corrections and updates

If you find an error in any calculator — a wrong number, a broken source link, or an outdated data point — please let us know. We take accuracy corrections seriously and will update the tool within 24 hours of verification.