{
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  "@type": "Dataset",
  "name": "How do you calculate cubic yards of concrete?",
  "description": "Multiply length × width × thickness in feet to get cubic feet, then divide by 27. A 20×10 ft slab at 4 inches (0.333 ft) thick: 20 × 10 × 0.333 = 66.7 cubic feet ÷ 27 = 2.47 cubic yards — order 2.75 yards with waste.",
  "url": "https://www.revenuelab.fyi/answers/how-to-calculate-concrete-yards",
  "dateModified": "2026-10-01",
  "creator": {
    "@type": "Organization",
    "name": "RevenueLab",
    "url": "https://www.revenuelab.fyi"
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  "license": "https://creativecommons.org/licenses/by/4.0/",
  "keywords": [
    "Concrete Cost Calculator",
    "Concrete Slab Cost Calculator",
    "Concrete Slab Material Calculator"
  ],
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    "@type": "DataDownload",
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  "json": {
    "type": "answer",
    "question": "How do you calculate cubic yards of concrete?",
    "shortAnswer": "Multiply length × width × thickness in feet to get cubic feet, then divide by 27. A 20×10 ft slab at 4 inches (0.333 ft) thick: 20 × 10 × 0.333 = 66.7 cubic feet ÷ 27 = 2.47 cubic yards — order 2.75 yards with waste.",
    "tableTitle": "Worked example: 20×10 ft patio slab, 4 in thick",
    "columns": [
      "Step",
      "Math",
      "Result"
    ],
    "rows": [
      {
        "label": "Convert thickness",
        "value": "4 in ÷ 12",
        "note": "0.333 ft"
      },
      {
        "label": "Volume in cubic feet",
        "value": "20 × 10 × 0.333",
        "note": "66.7 ft³"
      },
      {
        "label": "Convert to yards",
        "value": "66.7 ÷ 27",
        "note": "2.47 yd³"
      },
      {
        "label": "Add 10% waste",
        "value": "2.47 × 1.10",
        "note": "2.72 → order 2.75 yd³"
      }
    ],
    "context": "The two mistakes that blow up orders: forgetting to convert inches to feet (4 inches is 0.333 ft, not 4 ft), and ordering the exact volume with no margin. Ready-mix trucks have minimum loads (often 1–2 yards) and short-load fees, so a 2.47-yard need is usually cheaper ordered as 2.75 than risk a second delivery. For anything over ~2 yards, ready-mix beats bags on both price and labor.",
    "methodology": "Volume = L × W × D in consistent units; 1 cubic yard = 27 cubic feet. The 10% waste factor covers subgrade unevenness, spillage, and form bowing — the standard contractor allowance for slabs on grade.",
    "dateModified": "2026-10-01",
    "relatedCalculators": [
      {
        "label": "Concrete Cost Calculator",
        "to": "/concrete-cost-calculator"
      },
      {
        "label": "Concrete Slab Cost Calculator",
        "to": "/concrete-slab-cost-calculator"
      },
      {
        "label": "Concrete Slab Material Calculator",
        "to": "/concrete-slab-material-calculator"
      }
    ],
    "relatedReading": [
      {
        "label": "Concrete bag counts by project",
        "to": "/answers/how-many-bags-of-concrete-per-yard"
      }
    ]
  }
}