Formula Methodology
Every calculator on Ekuation goes through a verification workflow before publication. This page explains how we select sources, validate formulas, and make review decisions auditable.
Evidence-First Verification Workflow
We begin with primary references (regulatory guidance, standards documents, and peer-reviewed sources), derive the formula, and verify outputs against known reference cases.
AI systems are used as parallel cross-checks to surface disagreements and missing citations early. Any disagreement triggers manual review, and publication requires human sign-off against the cited sources.
Source Selection Standards
We only accept sources from authoritative institutions. Community-published pages, AI-generated content, and commercial calculators are never used as primary sources.
- Government health and science agencies (WHO, NIH, CDC, NIST, FDA)
- Professional associations and standards bodies (ACSM, ADA, ACOG, ASTM)
- Academic institutions and peer-reviewed journals (PubMed, NEJM, MIT OCW)
- National education authorities (College Board, UK NHS, European Commission)
Who Reviewed It
editorial-teamA human reviewer validates the formula against primary sources, checks unit handling and input boundaries, and signs off before publication.
external-expertA domain expert outside the core team independently reviews methodology, citations, and edge-case behavior.
ai-consensusMultiple AI systems are used as parallel research checks to surface disagreements and missing citations. AI output is not final authority and must match primary sources before release.
Review Freshness Schedule
Health, Finance
Guidelines change frequently; errors carry real-world consequences.
Science, Statistics, Education, Cooking, Construction
Standards are stable but can be updated annually by governing bodies.
Mathematics, Unit Conversions, Everyday
Formulas are based on immutable mathematical relationships.
Reporting a Formula Error
Every calculator result panel includes a Report a formula error link. Clicking it opens our feedback page with calculator context so we can investigate quickly.
When reporting, please include: the calculator name, the input values you used, the result you received, and the result you expected along with a source supporting it. This lets us reproduce and verify the issue as fast as possible.