Public evidence

electrical.swg_to_mm

Machine-checked verification for calculation version 1.3.1 · tier engine_tested

Open calculator API Capability Download JSON CVP Manifest MCP Review policy

CVP status

Discrete gauges 7/0 (−6)…50 only

Declared partition coverage: PASS · 8/8 declared partitions (heavy-gauge, zero-alias, ordinary-gauge, endpoints, field-mm, field-mm2, invalid-type, invalid-range)
Versions: Calculation 1.3.1 · CVP protocol 1.0.0-proposed · Evidence 2026-10-28.meta-metrics-v2
Verification revision: 2026-10-28.meta-metrics-v2 · 3/3 property · digest 03c18b9f6ed6

Verification

Legacy regression suite: 76/76 calculation tests · Production surface contract 6/6

Three distinct suites: educational examples on the calculator page, this legacy regression count (76/76 golden + boundary), and the CVP verification suite below. They are not the same number. Property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the CVP Manifest . SKIP (0/0) means that suite has no published vectors.

This calculator CURRENT · Public schema 1.3.1 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓

CVP verification suite

Protocol checks from the Evidence Manifest. Distinct from the legacy regression suite above. Verification revision 2026-10-28.meta-metrics-v2. Calculation version 1.3.1. CVP 1.0.0-proposed. 62/62 golden · 7/7 CVP boundary · 13/13 invalid · 3/3 property · 2/2 metamorphic · 4/4 cross-interface · 6/6 CVP contract. digest 03c18b9f6ed6.

Golden (oracle-backed) 62 / 62
CVP boundary 7 / 7
Invalid input 13 / 13
Property 3 / 3
Metamorphic 2 / 2
Cross-interface 4 / 4
CVP contract 6 / 6
Interfaces PASS · UI (SSR) / REST / MCP
Interface claim ui-ssr is query-result HTML, not a live browser session. Error-path engine·REST·MCP 1/1 (status, code, calculation_version). SSR compared on URL-canonical requested calculations; empty query is idle (not an error) and JSON-typed object/array inputs are REST/MCP-only.
Assurance Engineering

release artifacts aligned PASS
schema output required declared PASS
schema valid input executes PASS
engine success output validates schema PASS
schema rejects incomplete input PASS
rest success payload validates schema PASS

Fingerprint sha256:6681584e7bcf14adc599b12fb4de1ab3655d15c60d532bfe5b5a75e7060b4209

Input schema sha256:86262535bd5cf3d7af1106f20ae6d1ee4c4e3e4b01dc827e8f6a5b202b8e5b7c · Output schema sha256:e6a848b5ea8b44c3868034828fca95d72270e291ca16e3e92bdfb8284f7b808a · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Build & scope

Engine identity and declared limitations.

Tool: swg-to-mm
Engine: swg
Engine build: 2026-09-10
Evidence core: 2026-09-10T22:48:17.762Z
Rendered: 2026-11-10T05:18:41.709Z
Last reviewed: —

Assumptions

Canonical size is the Imperial SWG inch table (7/0–50). millimetre = inch × 25.4 (exact).
Area uses that millimetre, not a rounded display value.
Area assumes a solid circular cross-section of that diameter.
For tube/sheet use-cases, interpret d as wall/sheet thickness.
SWG 0 and 1/0 share the tabulated 0.324 in size used here; some catalogues list 1/0 separately.

Limitations

Lookup table only for integer SWG 7/0 (−6) through 50
Out-of-range → SWG_OUT_OF_RANGE (not 0 mm)
Non-integer → SWG_NOT_INTEGER (not Math.round)
Canonical diameter is inch; mm = inch × 25.4 (exact); area uses that mm
SWG ≠ AWG; same number different diameter

Sources

Standards and references supporting this tool specification. Methods are listed separately — they are algorithms, not bibliographic sources.

British Standards Institution — BS 3737:1964 — Guide to series of basic sizes for metal sheet, strip and wire — Status: Withdrawn. Public catalogue confirms identity/status. Exact PDF table/clause/page is not asserted. The 57-row inch dataset was independently checked 2026-09-10 against Wikipedia, Engineering Toolbox, and Trojan SF (57/57 inch identity); 0.324 in is canonical SWG 0, with 1/0 as alias.
Supports: Historical definition/reference for Imperial SWG diameter series (inch). Used as historical identity, not a current BSI product standard, and not a row-by-row BSI PDF transcription.
NIST Guide to the SI (SP 811) — Millimetre as the SI unit for length; 1 in = 25.4 mm exactly
Supports: d_mm = d_in × 25.4; diameter output in mm and area in mm²

Verification disclosure

Aggregate outcomes, scope and artifact commitments are public. Complete test inputs, expected values, execution records and oracle infrastructure are retained privately. This summary does not independently reproduce the full verification run.