CalcHQ Source-Backed

Calculation Methodology & QA Protocol

Our strict 5-stage engineering lifecycle ensures every calculator published passes rigorous mathematical and peer verification.

  1. Intent & Boundary Specification:

    Define the exact task intent, canonical input units, validation ranges, privacy classification, and risk tier.

  2. Primary Source Verification:

    Map formulas and dataset limits directly to regulatory bodies (CFPB, IRS, SEC, CDC, WHO, NIST, ISO).

  3. Immutable Service Implementation:

    Implement typed domain calculation services using BCMath precision arithmetic in PHP. Controllers remain free of business math.

  4. Canonical Test Vector Verification:

    Verify outputs against pre-computed canonical vectors, zero boundaries, negative values, and extreme edge cases.

  5. Peer Sign-off & Audit Trail:

    Independent review by domain specialists before activating the formula version and indexing the URL.