{
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  "@type": "Dataset",
  "name": "How much area does one bag of concrete cover?",
  "description": "An 80-lb bag covers about 1.8 square feet at 4 inches thick (0.60 ft³ ÷ 0.333 ft). A 60-lb bag covers 1.35 ft² and a 40-lb bag 0.9 ft² at the same thickness — so a 10×10 ft patio at 4 inches needs about 56 eighty-pound bags.",
  "url": "https://www.revenuelab.fyi/answers/how-to-calculate-concrete-coverage-per-bag",
  "dateModified": "2026-10-01",
  "creator": {
    "@type": "Organization",
    "name": "RevenueLab",
    "url": "https://www.revenuelab.fyi"
  },
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "keywords": [
    "Concrete Cost Calculator",
    "Concrete Slab Cost Calculator",
    "Concrete Slab Material Calculator"
  ],
  "distribution": {
    "@type": "DataDownload",
    "contentUrl": "https://www.revenuelab.fyi/api/public/page.json?path=answers%2Fhow-to-calculate-concrete-coverage-per-bag",
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  "json": {
    "type": "answer",
    "question": "How much area does one bag of concrete cover?",
    "shortAnswer": "An 80-lb bag covers about 1.8 square feet at 4 inches thick (0.60 ft³ ÷ 0.333 ft). A 60-lb bag covers 1.35 ft² and a 40-lb bag 0.9 ft² at the same thickness — so a 10×10 ft patio at 4 inches needs about 56 eighty-pound bags.",
    "tableTitle": "Coverage per bag at common thicknesses",
    "columns": [
      "Bag size",
      "At 4 in thick",
      "At 6 in thick"
    ],
    "rows": [
      {
        "label": "40 lb (0.30 ft³)",
        "value": "0.9 ft²",
        "note": "0.6 ft²"
      },
      {
        "label": "60 lb (0.45 ft³)",
        "value": "1.35 ft²",
        "note": "0.9 ft²"
      },
      {
        "label": "80 lb (0.60 ft³)",
        "value": "1.8 ft²",
        "note": "1.2 ft²"
      },
      {
        "label": "90 lb (0.675 ft³)",
        "value": "2.0 ft²",
        "note": "1.35 ft²"
      }
    ],
    "context": "Coverage math is where bag projects go wrong: people buy for the area and forget thickness. A 100 ft² walkway at 4 inches is 56 bags of 80-lb mix — at that point, check the ready-mix price, because 1.23 yards delivered often costs less than the bags and saves a day of mixing. Divide the coverage numbers by two if you're pouring a 2-inch overlay, and never go below 2 inches for a bonded overlay or 3.5–4 inches for a standalone slab.",
    "methodology": "Coverage = bag yield (ft³) ÷ thickness (ft). Yields are manufacturer-published for standard mixes; actual yield varies ±5% with water content and consolidation.",
    "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": "Bags per cubic yard",
        "to": "/answers/how-many-bags-of-concrete-per-yard"
      }
    ]
  }
}