Source: https://guthlabs.ai/docs/instruments/baker-s-percentage-converter/implementation/

instrument implementation / implementation-contract

# Baker's Percentage Converter implementation

A source-bound implementation contract for Baker's Percentage Converter; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## 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**: t2-019

**Effect**: Computation or source lookup only

## Input and validation requirements

The advertised total-dough-weight input mode is not fully defined by the supplied formulas: it requires an additional inversion to recover flour weight, and different declared basis modes give substantially different outputs. Zero flour also requires explicit rejection because percentage conversion is undefined.

## 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": {
    "mode": "percentages_to_weights",
    "flour_weight_g": 500,
    "ingredients": [
      {
        "name": "flour",
        "percentage": 100
      },
      {
        "name": "water",
        "percentage": 70
      },
      {
        "name": "salt",
        "percentage": 2
      },
      {
        "name": "yeast",
        "percentage": 1.4
      }
    ]
  },
  "expected_outputs": {
    "ingredients_g": {
      "flour": 500,
      "water": 350,
      "salt": 10,
      "yeast": 7
    },
    "ingredients_oz": {
      "flour": 17.64,
      "water": 12.35,
      "salt": 0.35,
      "yeast": 0.25
    },
    "total_dough_g": 867,
    "total_dough_oz": 30.58,
    "hydration_percent": 70,
    "salt_percent": 2
  },
  "working": "Flour = 500 g. Water = 70 × 500 / 100 = 350 g. Salt = 2 × 500 / 100 = 10 g. Yeast = 1.4 × 500 / 100 = 7 g. Total = 500 + 350 + 10 + 7 = 867 g. Hydration = 350 / 500 × 100 = 70%. Salt% = 10 / 500 × 100 = 2%. Ounces: 500 / 28.3495 = 17.64 oz; 350 / 28.3495 = 12.35 oz; 10 / 28.3495 = 0.35 oz; 7 / 28.3495 = 0.25 oz; 867 / 28.3495 = 30.58 oz."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/baker-s-percentage-converter/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/baker-s-percentage-converter/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/baker-s-percentage-converter/qualification/>)

## Sources and evidence

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

- `VERIFIED_LEDGER.json`

- `evidence-tranche2/tranche2-results.json`