{
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  "@type": "Dataset",
  "name": "How much concrete do you need per fence post?",
  "description": "A standard 4×4 post in an 8-inch diameter, 24-inch deep hole needs about 0.026 cubic yards — one to two 50-lb bags. The rule of thumb: hole diameter should be 3× the post width, and depth should be one-third of the post's above-ground height plus 6 inches of gravel.",
  "url": "https://www.revenuelab.fyi/answers/how-to-calculate-concrete-for-fence-posts",
  "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-for-fence-posts",
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  "json": {
    "type": "answer",
    "question": "How much concrete do you need per fence post?",
    "shortAnswer": "A standard 4×4 post in an 8-inch diameter, 24-inch deep hole needs about 0.026 cubic yards — one to two 50-lb bags. The rule of thumb: hole diameter should be 3× the post width, and depth should be one-third of the post's above-ground height plus 6 inches of gravel.",
    "tableTitle": "Concrete per post by hole size",
    "columns": [
      "Post / hole",
      "Hole volume",
      "Bags needed"
    ],
    "rows": [
      {
        "label": "4×4 post, 8 in × 24 in",
        "value": "0.70 ft³",
        "note": "2 × 50-lb or 1 × 80-lb + gravel"
      },
      {
        "label": "6×6 gate post, 12 in × 36 in",
        "value": "2.36 ft³",
        "note": "4 × 60-lb or 3 × 80-lb"
      },
      {
        "label": "Mailbox, 8 in × 18 in",
        "value": "0.52 ft³",
        "note": "1 × 60-lb"
      },
      {
        "label": "Pergola post, 12 in × 48 in",
        "value": "3.14 ft³",
        "note": "6 × 60-lb"
      }
    ],
    "context": "Deeper beats wider for stability: a 36-inch-deep post resists frost heave and wind load far better than a wide shallow one. Fast-setting mix is the right product here — it sets in 20–40 minutes without bracing. In frost zones, bell the bottom of the hole or use a formed pier so the freeze can't grab the smooth sides and jack the post upward; slope the top of the concrete away from the post so water doesn't pool against the wood.",
    "methodology": "Cylinder volume πr²d minus post displacement, converted to bag counts at published yields (50-lb ≈ 0.375 ft³, 60-lb ≈ 0.45 ft³, 80-lb ≈ 0.60 ft³). Depth guidance follows the one-third rule and IRC frost-depth requirements.",
    "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 for footings",
        "to": "/answers/how-to-calculate-concrete-for-footings"
      }
    ]
  }
}