{
  "id": "glass-weight",
  "version": "ed8fded4ae4d",
  "status": "published",
  "name": "Glass Weight Calculator",
  "question": "What is the glass weight?",
  "summary": "Glass weight calculator: the weight of a pane or sheet of flat, float, tempered or borosilicate glass from its length, width and thickness, with the weight per square foot and per square metre.",
  "category": "construction",
  "subcategory": "materials",
  "url": "https://www.acalculator.org/construction/glass-weight-calculator",
  "markdown": "https://www.acalculator.org/construction/glass-weight-calculator.md",
  "kind": "function",
  "method": "Weight = length × width × thickness × density × panes. Per square metre = thickness × density; per square foot = that × 0.09290304 ÷ 0.45359237.",
  "assumptions": [
    "Flat, float and window glass (soda-lime) is 2,530 kg/m³ (158 lb/ft³); borosilicate glass is 2,230 kg/m³. Tempered and laminated float glass weigh about the same as float glass; type a density for anything else.",
    "The pane is a flat rectangle; frames, edges and interlayers are not counted."
  ],
  "inputs": {
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "type": "object",
    "properties": {
      "l": {
        "title": "Length",
        "description": "The length of one pane.",
        "type": [
          "number",
          "string"
        ],
        "x-quantity": "length",
        "exclusiveMinimum": 0,
        "maximum": 100
      },
      "w": {
        "title": "Width",
        "description": "The width of one pane.",
        "type": [
          "number",
          "string"
        ],
        "x-quantity": "length",
        "exclusiveMinimum": 0,
        "maximum": 100
      },
      "t": {
        "title": "Thickness",
        "description": "The thickness of the glass, such as 1/4 in or 6 mm.",
        "type": [
          "number",
          "string"
        ],
        "x-quantity": "length",
        "exclusiveMinimum": 0,
        "maximum": 1
      },
      "n": {
        "title": "Panes",
        "description": "How many panes of this size.",
        "type": "integer",
        "minimum": 1,
        "maximum": 100000
      },
      "g": {
        "title": "Glass",
        "description": "The kind of glass, which sets the density. Tempered and laminated float glass weigh about the same as float glass.",
        "type": "string",
        "enum": [
          "flat",
          "boro",
          "custom"
        ]
      },
      "rho": {
        "title": "Density",
        "description": "The density of the glass.",
        "type": [
          "number",
          "string"
        ],
        "x-quantity": "density",
        "minimum": 100,
        "maximum": 10000
      }
    }
  },
  "outputs": {
    "total": {
      "label": "Total weight",
      "description": "Weight of one pane × panes.",
      "format": "quantity",
      "unit": "lb"
    },
    "piece": {
      "label": "Weight of one pane",
      "description": "Length × width × thickness × density.",
      "format": "quantity",
      "unit": "lb"
    },
    "perSqFt": {
      "label": "Weight per square foot",
      "description": "Pounds per square foot at this thickness.",
      "format": "number"
    },
    "perSqM": {
      "label": "Weight per square metre",
      "description": "Kilograms per square metre at this thickness.",
      "format": "number"
    },
    "area": {
      "label": "Glass area",
      "description": "Length × width × panes.",
      "format": "quantity",
      "unit": "ft2"
    }
  },
  "defaultAnswer": {
    "inputs": {
      "l": 1.2191999999999998,
      "w": 0.9144,
      "t": 0.00635,
      "n": 1,
      "g": "flat",
      "rho": 2500
    },
    "outputs": {
      "total": 17.91040546944,
      "piece": 17.91040546944,
      "perSqFt": 3.290473755367622,
      "perSqM": 16.0655,
      "area": 1.11483648
    },
    "text": "The glass weighs 39.486 lb (3.29 lb per square foot)."
  },
  "examples": [
    {
      "given": {
        "l": 1.2191999999999998,
        "w": 0.9144,
        "t": 0.00635,
        "n": 1,
        "g": "flat"
      },
      "expect": {
        "piece": 17.91040546944,
        "perSqFt": 3.290473755367622,
        "perSqM": 16.0655
      },
      "source": "Wikipedia, Soda–lime glass, properties table: flat glass density 2.53 g/cm³ at 20 °C, https://en.wikipedia.org/wiki/Soda%E2%80%93lime_glass (retrieved 2026-10-03); hand calculation in content.mdx: 0.00635 m × 2,530 = 16.0655 kg/m² × 1.11483648 m² = 17.9104 kg = 39.486 lb; 3.2905 lb/ft²",
      "tolerance": 1e-12
    },
    {
      "given": {
        "l": 1,
        "w": 0.5,
        "t": 0.005,
        "n": 4,
        "g": "boro"
      },
      "expect": {
        "total": 22.3,
        "perSqM": 11.15
      },
      "source": "Wikipedia, Borosilicate glass: about 2.23 g/cm³, https://en.wikipedia.org/wiki/Borosilicate_glass (retrieved 2026-10-03); hand calculation in content.mdx: 0.005 × 2,230 = 11.15 kg/m² × 2 m² = 22.3 kg",
      "tolerance": 1e-12
    },
    {
      "given": {
        "l": 0.6096,
        "w": 0.6096,
        "t": 0.01,
        "n": 1,
        "g": "custom",
        "rho": 2500
      },
      "expect": {
        "piece": 9.290304,
        "perSqM": 25
      },
      "source": "hand calculation in content.mdx: 0.01 m × 2,500 kg/m³ = 25 kg/m² × 0.37161216 m² (4 ft²; NIST SP 811 Appendix B, 1 ft = 0.3048 m, https://www.nist.gov/pml/special-publication-811, retrieved 2026-10-03) = 9.290304 kg",
      "tolerance": 1e-12
    }
  ],
  "sources": [
    "Wikipedia, Soda–lime glass, properties table: flat glass density 2.53 g/cm³ at 20 °C, retrieved 2026-10-03. https://en.wikipedia.org/wiki/Soda%E2%80%93lime_glass",
    "Wikipedia, Borosilicate glass: density about 2.23 g/cm³, retrieved 2026-10-03. https://en.wikipedia.org/wiki/Borosilicate_glass",
    "NIST Special Publication 811 (2008), Appendix B: 1 in = 0.0254 m, 1 ft = 0.3048 m, 1 lb = 0.45359237 kg exactly, retrieved 2026-10-03. https://www.nist.gov/pml/special-publication-811"
  ],
  "related": [
    "steel-weight",
    "density",
    "square-footage"
  ],
  "changelog": []
}