Mulch/Soil/Gravel Volume 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

t5-129

Effect

Computation or source lookup only

Input and validation requirements

A zero bag volume causes division by zero and an undefined bag count. Negative depth is also not guarded by the stated arithmetic and can produce negative volume and negative bag counts instead of a validation error.

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": {
    "area_ft2": 120,
    "depth_in": 3,
    "bag_volume_ft3": 2
  },
  "expected_outputs": {
    "volume_ft3": 30,
    "cubic_yards": 1.1111111111,
    "bags": 15
  },
  "working": "volume_ft3 = 120 × 3 ÷ 12 = 360 ÷ 12 = 30 ft³; cubic_yards = 30 ÷ 27 = 1.1111111111 yd³; bags = ceil(30 ÷ 2) = ceil(15) = 15 bags."
}

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-tranche5/tranche5-results.json