Lumber Board-Foot Calculator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t4-031

Effect

Computation or source lookup only

Input and validation requirements

The extreme-magnitude vector causes the JavaScript-style arithmetic to overflow to Infinity during thickness × width, so the calculator needs finite-input validation or explicit overflow handling. The specification also has no actual formula branch despite a branch-switch hazard probe.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "thickness_in": 1,
    "width_in": 6,
    "length_ft": 8,
    "quantity": 10,
    "price_per_bf": 4.5
  },
  "expected_outputs": {
    "total_board_feet": 40,
    "total_cost": 180
  },
  "working": "Per-board BF = (1 × 6 × 8) / 12 = 48 / 12 = 4 BF. Total BF = 4 × 10 = 40 BF. Total cost = 40 × 4.50 = 180.00."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche4/tranche4-results.json