{
  "source": "Pour Calculator deterministic concrete engine",
  "generatedAt": "2026-09-19",
  "title": "Sonotube Concrete Bag Chart",
  "units": "US customary",
  "assumptions": {
    "defaultWastePercent": 10,
    "geometry": "Each tube is treated as a full straight concrete cylinder.",
    "excluded": "Bell footings, flared bases, pads, tube-wall thickness and post displacement are not included.",
    "rounding": "Bag counts are rounded up to whole bags after adding waste.",
    "caution": "Confirm inside diameter, fill depth, footing design, frost depth and local code before pouring."
  },
  "formula": "volume cubic feet = pi * (diameter inches / 24)^2 * depth feet",
  "rows": [
    {
      "useLines": [
        "Light pier",
        "8 in tube"
      ],
      "diameterInches": 8,
      "depthInches": 36,
      "use": "Light pier 8 in tube",
      "tubeSize": "8 in dia x 36 in deep",
      "baseCubicFeet": 1.0471975511965974,
      "withTenPercentWasteCubicFeet": 1.1519173063162573,
      "cubicYardsWithTenPercentWaste": 0.04266360393763916,
      "bagCounts": {
        "60": 3,
        "80": 2
      }
    },
    {
      "useLines": [
        "Small deck",
        "10 in tube"
      ],
      "diameterInches": 10,
      "depthInches": 48,
      "use": "Small deck 10 in tube",
      "tubeSize": "10 in dia x 48 in deep",
      "baseCubicFeet": 2.181661564992912,
      "withTenPercentWasteCubicFeet": 2.3998277214922035,
      "cubicYardsWithTenPercentWaste": 0.08888250820341494,
      "bagCounts": {
        "60": 6,
        "80": 4
      }
    },
    {
      "useLines": [
        "Deck pier",
        "12 in tube"
      ],
      "diameterInches": 12,
      "depthInches": 48,
      "use": "Deck pier 12 in tube",
      "tubeSize": "12 in dia x 48 in deep",
      "baseCubicFeet": 3.141592653589793,
      "withTenPercentWasteCubicFeet": 3.455751918948773,
      "cubicYardsWithTenPercentWaste": 0.12799081181291752,
      "bagCounts": {
        "60": 8,
        "80": 6
      }
    },
    {
      "useLines": [
        "Deep pier",
        "12 in tube"
      ],
      "diameterInches": 12,
      "depthInches": 60,
      "use": "Deep pier 12 in tube",
      "tubeSize": "12 in dia x 60 in deep",
      "baseCubicFeet": 3.9269908169872414,
      "withTenPercentWasteCubicFeet": 4.319689898685966,
      "cubicYardsWithTenPercentWaste": 0.1599885147661469,
      "bagCounts": {
        "60": 10,
        "80": 8
      }
    },
    {
      "useLines": [
        "Large deck",
        "16 in tube"
      ],
      "diameterInches": 16,
      "depthInches": 48,
      "use": "Large deck 16 in tube",
      "tubeSize": "16 in dia x 48 in deep",
      "baseCubicFeet": 5.585053606381853,
      "withTenPercentWasteCubicFeet": 6.14355896702004,
      "cubicYardsWithTenPercentWaste": 0.2275392210007422,
      "bagCounts": {
        "60": 14,
        "80": 11
      }
    },
    {
      "useLines": [
        "Large pier",
        "16 in tube"
      ],
      "diameterInches": 16,
      "depthInches": 60,
      "use": "Large pier 16 in tube",
      "tubeSize": "16 in dia x 60 in deep",
      "baseCubicFeet": 6.981317007977317,
      "withTenPercentWasteCubicFeet": 7.679448708775049,
      "cubicYardsWithTenPercentWaste": 0.2844240262509277,
      "bagCounts": {
        "60": 18,
        "80": 13
      }
    },
    {
      "useLines": [
        "Heavy pier",
        "18 in tube"
      ],
      "diameterInches": 18,
      "depthInches": 48,
      "use": "Heavy pier 18 in tube",
      "tubeSize": "18 in dia x 48 in deep",
      "baseCubicFeet": 7.0685834705770345,
      "withTenPercentWasteCubicFeet": 7.775441817634738,
      "cubicYardsWithTenPercentWaste": 0.2879793265790644,
      "bagCounts": {
        "60": 18,
        "80": 13
      }
    },
    {
      "useLines": [
        "Big form",
        "24 in tube"
      ],
      "diameterInches": 24,
      "depthInches": 48,
      "use": "Big form 24 in tube",
      "tubeSize": "24 in dia x 48 in deep",
      "baseCubicFeet": 12.566370614359172,
      "withTenPercentWasteCubicFeet": 13.823007675795091,
      "cubicYardsWithTenPercentWaste": 0.5119632472516701,
      "bagCounts": {
        "60": 31,
        "80": 24
      }
    }
  ],
  "sources": [
    {
      "label": "QUIKRETE quantity calculator",
      "url": "https://www.quikrete.com/calculator/main.asp"
    },
    {
      "label": "Sakrete concrete calculators",
      "url": "https://www.sakrete.com/concrete-calculators/"
    },
    {
      "label": "Sonotube concrete form product guidance",
      "url": "https://www.sonotube.com/"
    }
  ]
}