{
  "slug": "100-ft-retaining-wall-blocks-calculator",
  "title": "100 Ft Retaining Wall Blocks Calculator",
  "heading": "100 Ft Retaining Wall Blocks Calculator",
  "category": "other",
  "url": "https://www.revenuelab.fyi/toolbox/100-ft-retaining-wall-blocks-calculator",
  "summary": "Blocks, courses, and cost for a 100-ft retaining wall, defaulted to a 2-ft wall height.",
  "description": "Retaining wall block counts depend on wall length, height, and the size of the block you're using. This calculator defaults to a 100-foot wall at 2 feet tall using a common 16-inch by 6-inch block face, calculating the number of courses needed to reach the target height and the total blocks for the full run, plus an estimated material cost.",
  "formula": "Courses = Wall Height ÷ Block Height. Blocks per Course = Wall Length ÷ Block Width. Total Blocks = Courses × Blocks per Course.",
  "dateModified": "2026-09-06",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=100-ft-retaining-wall-blocks-calculator",
  "inputs": [
    {
      "id": "wallLength",
      "label": "Wall length",
      "kind": "number",
      "hint": null,
      "default": 100,
      "unit": "ft",
      "min": 1,
      "max": null
    },
    {
      "id": "wallHeight",
      "label": "Wall height",
      "kind": "number",
      "hint": null,
      "default": 2,
      "unit": "ft",
      "min": 0.5,
      "max": 10
    },
    {
      "id": "blockWidth",
      "label": "Block width",
      "kind": "number",
      "hint": null,
      "default": 16,
      "unit": "in",
      "min": 6,
      "max": 24
    },
    {
      "id": "blockHeight",
      "label": "Block height",
      "kind": "number",
      "hint": null,
      "default": 6,
      "unit": "in",
      "min": 3,
      "max": 12
    },
    {
      "id": "blockPrice",
      "label": "Price per block",
      "kind": "number",
      "hint": null,
      "default": 3.5,
      "unit": "$",
      "min": 0,
      "max": null
    }
  ],
  "outputs": [
    {
      "id": "totalBlocks",
      "label": "Total blocks needed",
      "format": "number",
      "hint": null,
      "primary": true
    },
    {
      "id": "courses",
      "label": "Courses (rows) high",
      "format": "number",
      "hint": null,
      "primary": false
    },
    {
      "id": "cost",
      "label": "Estimated block cost",
      "format": "currency",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Wall length: 100 ft",
      "Wall height: 2 ft",
      "Block width: 16 in",
      "Block height: 6 in",
      "Price per block: 3.5 $"
    ],
    "outputs": [
      "Total blocks needed: 300",
      "Courses (rows) high: 4",
      "Estimated block cost: $1,050"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter wall length (ft).",
      "Enter wall height (ft).",
      "Enter block width (in).",
      "Enter block height (in).",
      "Enter price per block ($).",
      "Read your total blocks 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": {
        "wallLength": 60,
        "wallHeight": 1.2,
        "blockWidth": 10,
        "blockHeight": 3.5999999999999996,
        "blockPrice": 2.1
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "wallLength": 100,
        "wallHeight": 2,
        "blockWidth": 16,
        "blockHeight": 6,
        "blockPrice": 3.5
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "wallLength": 160,
        "wallHeight": 3.2,
        "blockWidth": 24,
        "blockHeight": 9.600000000000001,
        "blockPrice": 5.6000000000000005
      }
    }
  ],
  "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 many blocks are in one course of a 100-ft wall?",
      "a": "With a 16-inch block, about 75 blocks per course — narrower blocks require more per course, and this calculator recalculates automatically for your block size."
    },
    {
      "q": "Do I need gravel backfill behind a retaining wall?",
      "a": "Yes, a gravel drainage layer behind the blocks is essential to relieve hydrostatic pressure and prevent the wall from bowing or failing over time."
    },
    {
      "q": "How tall can a retaining wall be without engineering?",
      "a": "Most jurisdictions require an engineered design and permit above 3-4 feet; check local codes before building anything taller than that."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/100-ft-fence-calculator",
    "https://www.revenuelab.fyi/toolbox/200-ft-fence-calculator"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — 100 Ft Retaining Wall Blocks Calculator (https://www.revenuelab.fyi/toolbox/100-ft-retaining-wall-blocks-calculator)"
}