Source: https://guthlabs.ai/docs/instruments/firewood-cord-calculator/

instrument / verified-clean

# Firewood / Cord Calculator

The current ledger marks this instrument verified clean within the source-bound verification corpus.

Status: **VERIFIED_CLEAN**Lifecycle: **verified-clean**

## Inspectable records

[01**Overview**Purpose and lifecycle](<https://guthlabs.ai/docs/instruments/firewood-cord-calculator/>)[02**Mechanism**Method and assumptions](<https://guthlabs.ai/docs/instruments/firewood-cord-calculator/mechanism/>)[03**Implementation**Binding and validation](<https://guthlabs.ai/docs/instruments/firewood-cord-calculator/implementation/>)[04**Qualification**Evidence and errata](<https://guthlabs.ai/docs/instruments/firewood-cord-calculator/qualification/>)

## Ledger state

The current ledger marks this instrument verified clean within the source-bound verification corpus.

**Area**: Everyday & Life

**Tranche**: tranche-5

**Evidence ID**: t5-120

**Ledger rows**: 1

No ledger note is attached.

## Review findings

The formula is standard and arithmetically correct. Review is required only because the input units and conversion behavior are unspecified. The honest label should say 'stacked firewood volume in cords' and should not imply solid-wood volume.

### Formula and scope findings

No additional record

### Unit assumptions

- The formula is correct when stack length, width, and height are all measured in feet: 1 cord = 128 cubic feet of stacked volume.

- The exact ambiguity is whether the instrument accepts feet only or accepts other units and converts them to feet; the input specification does not say.

- The result represents stacked volume, including normal air gaps between pieces, not the solid-wood volume.

## Boundary hardening

**BREAK_CLAIMED** · SELF_FLAGGED

Very large finite-looking inputs overflow JavaScript arithmetic and produce Infinity rather than a finite cord value. Negative dimensions also produce a negative result unless physical-input validation rejects them.

## Errata and corrections

No applied erratum is attached to this unique-name record.

## Inspectable example

4 review vectors are recorded. One source-bound sample is shown below.

````
{
  "inputs": {
    "L_ft": 8,
    "W_ft": 4,
    "H_ft": 4
  },
  "expected_outputs": {
    "cords": 1
  },
  "working": "Volume = 8 ft × 4 ft × 4 ft = 128 ft³. Cords = 128 ÷ 128 = 1 cord."
}
````

## Related workflows

No source-defined multi-instrument workflow membership is recorded.

## Sources and evidence

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

- `VERIFIED_LEDGER.json · VERIFIED_CLEAN`

- `evidence-tranche5/tranche5-results.json`

- `BOUNDARY_HAZARD_CATALOG.json`