Tile & Flooring 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

t4-007

Effect

Computation or source lookup only

Input and validation requirements

The specification permits a zero tile area that causes division by zero, does not define validation for zero room area, and provides no formula or required inputs for the grout estimate.

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": {
    "room_length_ft": 12,
    "room_width_ft": 10,
    "tile_length_in": 12,
    "tile_width_in": 12,
    "waste_percent": 10,
    "layout": "straight",
    "tiles_per_box": 10
  },
  "expected_outputs": {
    "room_area_sq_ft": 120,
    "tile_area_sq_ft": 1,
    "tiles": 132,
    "boxes": 14
  },
  "working": "1. Room area = 12 ft × 10 ft = 120 ft². 2. Tile area = 12 in × 12 in = 1 ft × 1 ft = 1 ft². 3. Waste-adjusted area = 120 × (1 + 10/100) = 120 × 1.10 = 132 ft². 4. Tiles = ceil(132 / 1) = ceil(132) = 132. 5. Boxes = ceil(132 / 10) = ceil(13.2) = 14."
}

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