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  "name": "How do you calculate concrete for a slab?",
  "description": "Slab volume = length × width × thickness ÷ 27, in feet. A 24×24 ft garage slab at 6 inches thick: 24 × 24 × 0.5 ÷ 27 = 10.67 yards — order 11.5 with waste. Use 4 inches for patios and walkways, 5–6 inches for driveways and garages.",
  "url": "https://www.revenuelab.fyi/answers/how-to-calculate-concrete-for-a-slab",
  "dateModified": "2026-10-01",
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    "@type": "Organization",
    "name": "RevenueLab",
    "url": "https://www.revenuelab.fyi"
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  "license": "https://creativecommons.org/licenses/by/4.0/",
  "keywords": [
    "Concrete Slab Cost Calculator",
    "Concrete Slab Material Calculator",
    "Concrete Cost Calculator"
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  "json": {
    "type": "answer",
    "question": "How do you calculate concrete for a slab?",
    "shortAnswer": "Slab volume = length × width × thickness ÷ 27, in feet. A 24×24 ft garage slab at 6 inches thick: 24 × 24 × 0.5 ÷ 27 = 10.67 yards — order 11.5 with waste. Use 4 inches for patios and walkways, 5–6 inches for driveways and garages.",
    "tableTitle": "Thickness rules of thumb by slab use",
    "columns": [
      "Slab type",
      "Thickness",
      "Yards per 100 ft²"
    ],
    "rows": [
      {
        "label": "Sidewalk / patio",
        "value": "4 in",
        "note": "1.23 yd³"
      },
      {
        "label": "Residential driveway",
        "value": "5–6 in",
        "note": "1.54–1.85 yd³"
      },
      {
        "label": "Garage floor",
        "value": "6 in",
        "note": "1.85 yd³"
      },
      {
        "label": "RV / heavy vehicle pad",
        "value": "6–8 in",
        "note": "1.85–2.47 yd³"
      }
    ],
    "context": "Thickness is the decision that matters more than the exact volume: a 4-inch driveway that cracks under an SUV costs far more than the extra 0.6 yards per 100 ft² that 6 inches would have added. Reinforcement (rebar or wire mesh) and a compacted gravel base of 4 inches are standard for anything vehicle-bearing. Irregular shapes: split into rectangles, compute each, and add.",
    "methodology": "Volume formula as in the cubic-yards answer; thickness guidance follows ACI 302 residential practice (4 in minimum for pedestrian slabs, 5–6 in for light vehicles). Yards per 100 ft² = thickness in feet × 100 ÷ 27.",
    "dateModified": "2026-10-01",
    "relatedCalculators": [
      {
        "label": "Concrete Slab Cost Calculator",
        "to": "/concrete-slab-cost-calculator"
      },
      {
        "label": "Concrete Slab Material Calculator",
        "to": "/concrete-slab-material-calculator"
      },
      {
        "label": "Concrete Cost Calculator",
        "to": "/concrete-cost-calculator"
      }
    ],
    "relatedReading": [
      {
        "label": "How to calculate cubic yards",
        "to": "/answers/how-to-calculate-concrete-yards"
      }
    ]
  }
}