{
  "slug": "concrete",
  "title": "Concrete Calculator",
  "heading": "Concrete Calculator",
  "category": "other",
  "url": "https://www.revenuelab.fyi/toolbox/concrete",
  "summary": "Cubic yards of concrete for a slab.",
  "description": "Estimate concrete volume for a rectangular slab from length, width, and thickness.",
  "formula": null,
  "dateModified": "2026-10-03",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=concrete",
  "inputs": [
    {
      "id": "length",
      "label": "Length",
      "kind": "number",
      "hint": null,
      "default": 20,
      "unit": "ft",
      "min": 0,
      "max": null
    },
    {
      "id": "width",
      "label": "Width",
      "kind": "number",
      "hint": null,
      "default": 10,
      "unit": "ft",
      "min": 0,
      "max": null
    },
    {
      "id": "thickness",
      "label": "Thickness",
      "kind": "number",
      "hint": null,
      "default": 4,
      "unit": "in",
      "min": 0,
      "max": null
    },
    {
      "id": "waste",
      "label": "Waste / overage",
      "kind": "number",
      "hint": null,
      "default": 10,
      "unit": "%",
      "min": 0,
      "max": null
    }
  ],
  "outputs": [
    {
      "id": "cubicYd",
      "label": "Concrete needed",
      "format": "decimal",
      "hint": "cubic yards (with waste)",
      "primary": true
    },
    {
      "id": "cubicFt",
      "label": "Cubic feet (no waste)",
      "format": "decimal",
      "hint": null,
      "primary": false
    },
    {
      "id": "bags60",
      "label": "60-lb bags (estimate)",
      "format": "number",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Length: 20 ft",
      "Width: 10 ft",
      "Thickness: 4 in",
      "Waste / overage: 10 %"
    ],
    "outputs": [
      "Concrete needed: 2.72",
      "Cubic feet (no waste): 66.7",
      "60-lb bags (estimate): 163"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter length (ft).",
      "Enter width (ft).",
      "Enter thickness (in).",
      "Enter waste / overage (%).",
      "Read your concrete needed on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "length": 12,
        "width": 6,
        "thickness": 2.4,
        "waste": 6
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "length": 20,
        "width": 10,
        "thickness": 4,
        "waste": 10
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "length": 32,
        "width": 16,
        "thickness": 6.4,
        "waste": 16
      }
    }
  ],
  "limitations": [
    "Estimates assume standard, average conditions — local rules, pricing, and materials vary.",
    "Results are rounded for readability; add a buffer before ordering, booking, or committing.",
    "Double-check anything with a real cost attached against a local quote."
  ],
  "faq": [
    {
      "q": "How does the concrete calculator work?",
      "a": "Estimate concrete volume for a rectangular slab from length, width, and thickness."
    },
    {
      "q": "What do I need to enter?",
      "a": "4 values: length, width, thickness, and waste / overage. Each field starts with a sensible default, so you can change one number at a time and watch the result move."
    },
    {
      "q": "What does the concrete needed result mean?",
      "a": "cubic yards (with waste) It is returned as a decimal number and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds."
    },
    {
      "q": "Is this calculator free, and do I need an account?",
      "a": "Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser."
    },
    {
      "q": "How accurate is the result?",
      "a": "It applies the standard formula exactly, so the arithmetic is precise. Estimates assume standard, average conditions — local rules, pricing, and materials vary."
    },
    {
      "q": "Who is this tool for?",
      "a": "It's built for anyone doing everyday planning maths — a quick estimate that would otherwise need four browser tabs and a calculator app."
    }
  ],
  "related": [],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Concrete Calculator (https://www.revenuelab.fyi/toolbox/concrete)"
}