{
  "schemaVersion": "1.0",
  "slug": "adjustable-shelf-pack-calculator",
  "route": "/tools/components/adjustable-shelf-pack-calculator/",
  "categorySlug": "shelves-and-backs",
  "name": "Adjustable Shelf Pack",
  "title": "Adjustable Shelf Pack Calculator",
  "description": "Plan an adjustable shelf batch from clear opening dimensions, equal side clearances, front and back setbacks, material thickness, and quantity.",
  "searchIntent": "adjustable cabinet shelf cut list calculator",
  "modelVersion": "1.0.0",
  "reviewedDate": "2026-07-30",
  "defaultInputs": {
    "insideWidth": 28.5,
    "insideDepth": 23.25,
    "sideClearance": 0.125,
    "frontSetback": 0.25,
    "backClearance": 0.25,
    "shelfThickness": 0.75,
    "shelfCount": 4
  },
  "inputs": [
    {
      "id": "insideWidth",
      "label": "Finished inside width",
      "default": 28.5,
      "min": 3,
      "max": 120,
      "step": 0.0625,
      "unit": "in",
      "help": "Clear width at the shelf locations after cabinet assembly."
    },
    {
      "id": "insideDepth",
      "label": "Finished inside depth",
      "default": 23.25,
      "min": 3,
      "max": 60,
      "step": 0.0625,
      "unit": "in",
      "help": "Clear depth from the selected front datum to the inside back."
    },
    {
      "id": "sideClearance",
      "label": "Clearance at each side",
      "default": 0.125,
      "min": 0,
      "max": 1,
      "step": 0.03125,
      "unit": "in",
      "help": "Deliberate clearance between shelf edge and each side; verify with the actual support hardware."
    },
    {
      "id": "frontSetback",
      "label": "Front setback",
      "default": 0.25,
      "min": 0,
      "max": 12,
      "step": 0.0625,
      "unit": "in",
      "help": "Distance from the cabinet front datum to the shelf front edge."
    },
    {
      "id": "backClearance",
      "label": "Back clearance",
      "default": 0.25,
      "min": 0,
      "max": 12,
      "step": 0.0625,
      "unit": "in",
      "help": "Clearance between the shelf back edge and installed back or obstruction."
    },
    {
      "id": "shelfThickness",
      "label": "Shelf thickness",
      "default": 0.75,
      "min": 0.125,
      "max": 3,
      "step": 0.03125,
      "unit": "in",
      "help": "Measured finished thickness including any permanently bonded build-up."
    },
    {
      "id": "shelfCount",
      "label": "Shelf quantity",
      "default": 4,
      "min": 1,
      "max": 48,
      "step": 1,
      "unit": "count",
      "help": "Number of identical shelves in the pack."
    }
  ],
  "formulas": [
    {
      "part": "Adjustable shelf",
      "quantity": "shelfCount",
      "length": "insideWidth - 2 * sideClearance",
      "width": "insideDepth - frontSetback - backClearance",
      "thickness": "shelfThickness",
      "formulaNote": "Equal side clearances are deducted from the clear opening; support-hardware projection, edge treatment, and load capacity are separate checks."
    }
  ],
  "defaultParts": [
    {
      "name": "Adjustable shelf",
      "quantity": 4,
      "length": 28.25,
      "width": 22.75,
      "thickness": 0.75,
      "materialGroup": "Shelf panel",
      "grain": "Lengthwise across cabinet width",
      "formulaNote": "Equal side clearances are deducted from the clear opening; support-hardware projection, edge treatment, and load capacity are separate checks."
    }
  ],
  "assumptions": [
    "The same equal side clearance applies to all shelves in the modeled opening group.",
    "The inside back is installed and stable before the final shelf depth is released.",
    "Shelf pins or clips provide approved support without requiring an unmodeled notch, groove, or side projection.",
    "This is a reviewable planning model, not a universal cabinetmaking standard; the shop drawing, approved sample, field dimensions, and contract documents remain authoritative.",
    "Manufacturer hardware dimensions, load ratings, fastener schedules, edge distances, and drilling requirements govern whenever hardware is involved."
  ],
  "checks": [
    "Confirm the finished shelf can be tilted or translated through the door and face-frame opening for installation and removal.",
    "Check the tightest measured opening rather than relying on the average inside width.",
    "Verify support hardware, span, load, edge treatment, and material capacity for every intended shelf elevation.",
    "Measure the actual sheet, board, or panel thickness from the material lot and reconcile it with every mating groove, dado, fastener, and hardware allowance.",
    "Build or dry-fit the first assembly, record the verified result, and release the remaining batch only under the same model revision."
  ],
  "stopConditions": [
    "Stop when the shelf-pin or clip product and its required clearance or bearing geometry are unknown.",
    "Stop when allowable span, load, deflection, material grade, or edge reinforcement has not been approved.",
    "Stop when the exact hardware product, current manufacturer data, or required attachment method is unresolved; do not substitute a generic allowance.",
    "Stop when field dimensions, actual material thickness, grain requirement, or model revision cannot be verified before batch cutting."
  ],
  "sources": [
    {
      "name": "ANSI/AWI 1235-2024 – Specialty Casework",
      "url": "https://awinet.org/standards/specialty-casework/requirements-specialty-casework/3-2-material-6/",
      "scope": "Primary industry standard used here for casework material, component, and hardware-planning context. Its published scope is specialty casework; it does not set universal residential cabinet dimensions or replace project documents."
    },
    {
      "name": "USDA Forest Products Laboratory – Wood Handbook, Chapter 11",
      "url": "https://www.fpl.fs.usda.gov/documnts/fplgtr/fplgtr282/chapter_11_fpl_gtr282.pdf",
      "scope": "Primary government reference for wood-based composite material characteristics. It supports material-behavior checks, not project-specific span, load, machining, or fastening approval."
    }
  ]
}