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: CVP VERIFIED · CVP protocol 1.0.0-proposed · Engineering assurance· Discrete gauges 7/0 (−6)…50 only · Protocol · Schema · Production report

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 2026-09-10.authoritative-provenance
Verification revision: 2026-09-10.authoritative-provenance · 3/3 property · digest c2cc961fa949

Verification

Legacy regression suite: 76/76 calculation tests · Production surface contract 4/4

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 2026-09-10.authoritative-provenance. Calculation version 1.3.1. CVP 1.0.0-proposed. 62/62 golden · 7/7 CVP boundary · 13/13 invalid · 3/3 property · 4/4 cross-interface · 1/1 CVP contract. digest c2cc961fa949.

Golden (oracle-backed) 62 / 62
CVP boundary 7 / 7
Invalid input 13 / 13
Property 3 / 3
Cross-interface 4 / 4
CVP contract 1 / 1
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 valid input executes PASS
engine success output validates schema PASS
schema rejects incomplete input 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: 2026-09-16T22:03:43.710Z
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

Legacy published checks

Golden and boundary cases from the legacy Evidence JSON. CVP property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the Manifest — including SKIP when a suite has no vectors.

ID	Kind	Status	Detail
`swg-14-mm`	golden	pass	Expected 2.032 · Actual 2.032
`swg-14-mm2`	golden	pass	Expected 3.2429278662239858 · Actual 3.2429278662239853
`swg-22-mm`	golden	pass	Expected 0.7112 · Actual 0.7111999999999999
`swg-22-mm2`	golden	pass	Expected 0.39725866361243817 · Actual 0.39725866361243817
`swg-50-mm`	golden	pass	Expected 0.0254 · Actual 0.0254
`swg-50-mm2`	golden	pass	Expected 0.0005067074790974977 · Actual 0.0005067074790974977
`swg-neg6-mm`	golden	pass	Expected 12.7 · Actual 12.7
`swg-0-mm`	golden	pass	Expected 8.2296 · Actual 8.2296
`swg-16-mm`	golden	pass	Expected 1.6256 · Actual 1.6256
`table-swg-6_0-mm`	golden	pass	Expected 11.7856 · Actual 11.7856
`table-swg-5_0-mm`	golden	pass	Expected 10.9728 · Actual 10.9728
`table-swg-4_0-mm`	golden	pass	Expected 10.16 · Actual 10.16
`table-swg-3_0-mm`	golden	pass	Expected 9.448799999999999 · Actual 9.448799999999999
`table-swg-2_0-mm`	golden	pass	Expected 8.839199999999998 · Actual 8.839199999999998
`table-swg-1-mm`	golden	pass	Expected 7.619999999999999 · Actual 7.619999999999999
`table-swg-2-mm`	golden	pass	Expected 7.010400000000001 · Actual 7.010400000000001
`table-swg-3-mm`	golden	pass	Expected 6.400799999999999 · Actual 6.400799999999999
`table-swg-4-mm`	golden	pass	Expected 5.8928 · Actual 5.8928
`table-swg-5-mm`	golden	pass	Expected 5.384799999999999 · Actual 5.384799999999999
`table-swg-6-mm`	golden	pass	Expected 4.8768 · Actual 4.8768
`table-swg-7-mm`	golden	pass	Expected 4.4704 · Actual 4.4704
`table-swg-8-mm`	golden	pass	Expected 4.064 · Actual 4.064
`table-swg-9-mm`	golden	pass	Expected 3.6575999999999995 · Actual 3.6575999999999995
`table-swg-10-mm`	golden	pass	Expected 3.2512 · Actual 3.2512
`table-swg-11-mm`	golden	pass	Expected 2.9464 · Actual 2.9464
`table-swg-12-mm`	golden	pass	Expected 2.6416 · Actual 2.6416
`table-swg-13-mm`	golden	pass	Expected 2.3367999999999998 · Actual 2.3367999999999998
`table-swg-15-mm`	golden	pass	Expected 1.8287999999999998 · Actual 1.8287999999999998
`table-swg-17-mm`	golden	pass	Expected 1.4223999999999999 · Actual 1.4223999999999999
`table-swg-18-mm`	golden	pass	Expected 1.2192 · Actual 1.2192
`table-swg-19-mm`	golden	pass	Expected 1.016 · Actual 1.016
`table-swg-20-mm`	golden	pass	Expected 0.9143999999999999 · Actual 0.9143999999999999
`table-swg-21-mm`	golden	pass	Expected 0.8128 · Actual 0.8128
`table-swg-22-mm`	golden	pass	Expected 0.7111999999999999 · Actual 0.7111999999999999
`table-swg-23-mm`	golden	pass	Expected 0.6096 · Actual 0.6096
`table-swg-24-mm`	golden	pass	Expected 0.5588 · Actual 0.5588
`table-swg-25-mm`	golden	pass	Expected 0.508 · Actual 0.508
`table-swg-26-mm`	golden	pass	Expected 0.45719999999999994 · Actual 0.45719999999999994
`table-swg-27-mm`	golden	pass	Expected 0.41656 · Actual 0.41656
`table-swg-28-mm`	golden	pass	Expected 0.37592 · Actual 0.37592
`table-swg-29-mm`	golden	pass	Expected 0.34543999999999997 · Actual 0.34543999999999997
`table-swg-30-mm`	golden	pass	Expected 0.31495999999999996 · Actual 0.31495999999999996
`table-swg-31-mm`	golden	pass	Expected 0.29463999999999996 · Actual 0.29463999999999996
`table-swg-32-mm`	golden	pass	Expected 0.27432 · Actual 0.27432
`table-swg-33-mm`	golden	pass	Expected 0.254 · Actual 0.254
`table-swg-34-mm`	golden	pass	Expected 0.23367999999999997 · Actual 0.23367999999999997
`table-swg-35-mm`	golden	pass	Expected 0.21335999999999997 · Actual 0.21335999999999997
`table-swg-36-mm`	golden	pass	Expected 0.19304 · Actual 0.19304
`table-swg-37-mm`	golden	pass	Expected 0.17271999999999998 · Actual 0.17271999999999998
`table-swg-38-mm`	golden	pass	Expected 0.1524 · Actual 0.1524
`table-swg-39-mm`	golden	pass	Expected 0.13207999999999998 · Actual 0.13207999999999998
`table-swg-40-mm`	golden	pass	Expected 0.12191999999999999 · Actual 0.12191999999999999
`table-swg-41-mm`	golden	pass	Expected 0.11176 · Actual 0.11176
`table-swg-42-mm`	golden	pass	Expected 0.1016 · Actual 0.1016
`table-swg-43-mm`	golden	pass	Expected 0.09144 · Actual 0.09144
`table-swg-44-mm`	golden	pass	Expected 0.08128 · Actual 0.08128
`table-swg-45-mm`	golden	pass	Expected 0.07111999999999999 · Actual 0.07111999999999999
`table-swg-46-mm`	golden	pass	Expected 0.06095999999999999 · Actual 0.06095999999999999
`table-swg-47-mm`	golden	pass	Expected 0.0508 · Actual 0.0508
`table-swg-48-mm`	golden	pass	Expected 0.04064 · Actual 0.04064
`table-swg-49-mm`	golden	pass	Expected 0.030479999999999997 · Actual 0.030479999999999997
`table-swg-7-0-token-mm`	golden	pass	Expected 12.7 · Actual 12.7
`table-swg-1-0-token-mm`	golden	pass	Expected 8.2296 · Actual 8.2296
`boundary-swg-out-of-table`	boundary	pass	Expected SWG_OUT_OF_RANGE · Actual SWG_OUT_OF_RANGE
`boundary-swg-below`	boundary	pass	Expected SWG_OUT_OF_RANGE · Actual SWG_OUT_OF_RANGE
`boundary-swg-not-integer`	boundary	pass	Expected SWG_NOT_INTEGER · Actual SWG_NOT_INTEGER
`boundary-swg-half`	boundary	pass	Expected SWG_NOT_INTEGER · Actual SWG_NOT_INTEGER
`boundary-swg-unparseable`	boundary	pass	Expected INVALID_NUMBER · Actual INVALID_NUMBER
`boundary-swg-empty`	boundary	pass	Expected MISSING_REQUIRED_INPUT · Actual MISSING_REQUIRED_INPUT
`boundary-swg-missing`	boundary	pass	Expected MISSING_REQUIRED_INPUT · Actual MISSING_REQUIRED_INPUT
`boundary-swg-invalid-field`	boundary	pass	Expected INVALID_MODE · Actual INVALID_MODE
`property-deterministic`	property	pass	same SWG → same mm
`property-thicker-lower-swg`	property	pass	SWG10 > SWG16 diameter
`property-area-from-diameter`	property	pass	mm² = πd²/4 from exact mm
`property-7-0-token`	property	pass	7/0 equals −6
`property-monotonic-table`	property	pass	diameter decreases as SWG increases (−6…50)