{
  "slug": "embodied-carbon-materials",
  "title": "Embodied Carbon of Materials Calculator",
  "heading": "Embodied Carbon Calculator for Building Materials",
  "category": "other",
  "url": "https://www.revenuelab.fyi/toolbox/embodied-carbon-materials",
  "summary": "Upfront carbon footprint of concrete, steel, and other construction materials.",
  "description": "Embodied carbon is the emissions baked into a material before it ever gets used — extraction, manufacturing, and transport — and for new construction it can rival or exceed a building's entire operational emissions over its first decade. This calculator estimates upfront (A1-A3) embodied carbon for the major structural material categories using published global warming potential factors per unit of material, then totals it into a project-level figure. Concrete and steel dominate most embodied carbon budgets because of the volumes used structurally; mass timber and low-carbon concrete mixes (with fly ash or slag cement replacement) can meaningfully cut the total. This is the calculation behind LEED v4.1 Materials & Resources whole-building LCA credits and increasingly behind local embodied-carbon ordinances (like those in several California and Colorado jurisdictions) that cap upfront carbon per square foot for new municipal and large commercial buildings.",
  "formula": "Embodied carbon = Σ(material quantity × GWP factor per unit), summed across concrete, steel, and other inputs.",
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=embodied-carbon-materials",
  "inputs": [
    {
      "id": "concreteCy",
      "label": "Concrete volume",
      "kind": "number",
      "hint": null,
      "default": 2000,
      "unit": "cubic yards",
      "min": 0,
      "max": null
    },
    {
      "id": "concreteGwp",
      "label": "Concrete GWP factor",
      "kind": "number",
      "hint": null,
      "default": 300,
      "unit": "kg CO2e/cy",
      "min": 0,
      "max": null
    },
    {
      "id": "steelTons",
      "label": "Structural steel",
      "kind": "number",
      "hint": null,
      "default": 400,
      "unit": "tons",
      "min": 0,
      "max": null
    },
    {
      "id": "steelGwp",
      "label": "Steel GWP factor",
      "kind": "number",
      "hint": null,
      "default": 1800,
      "unit": "kg CO2e/ton",
      "min": 0,
      "max": null
    },
    {
      "id": "sqft",
      "label": "Gross building area",
      "kind": "number",
      "hint": null,
      "default": 150000,
      "unit": "sq ft",
      "min": 1,
      "max": null
    }
  ],
  "outputs": [
    {
      "id": "totalTons",
      "label": "Total upfront embodied carbon",
      "format": "number",
      "hint": null,
      "primary": true
    },
    {
      "id": "concreteTons",
      "label": "From concrete",
      "format": "number",
      "hint": null,
      "primary": false
    },
    {
      "id": "steelTons",
      "label": "From steel",
      "format": "number",
      "hint": null,
      "primary": false
    },
    {
      "id": "kgPerSqft",
      "label": "kg CO2e per sq ft",
      "format": "decimal",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Concrete volume: 2000 cubic yards",
      "Concrete GWP factor: 300 kg CO2e/cy",
      "Structural steel: 400 tons",
      "Steel GWP factor: 1800 kg CO2e/ton",
      "Gross building area: 150000 sq ft"
    ],
    "outputs": [
      "Total upfront embodied carbon: 1,320",
      "From concrete: 600",
      "From steel: 720",
      "kg CO2e per sq ft: 8.8"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter concrete volume (cubic yards).",
      "Enter concrete gwp factor (kg CO2e/cy).",
      "Enter structural steel (tons).",
      "Enter steel gwp factor (kg CO2e/ton).",
      "Enter gross building area (sq ft).",
      "Read your total upfront embodied carbon on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "concreteCy": 1200,
        "concreteGwp": 180,
        "steelTons": 240,
        "steelGwp": 1100,
        "sqft": 90000
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "concreteCy": 2000,
        "concreteGwp": 300,
        "steelTons": 400,
        "steelGwp": 1800,
        "sqft": 150000
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "concreteCy": 3200,
        "concreteGwp": 480,
        "steelTons": 640,
        "steelGwp": 2900,
        "sqft": 240000
      }
    }
  ],
  "limitations": [
    "Estimates assume standard, average conditions — local rules, pricing, and materials vary.",
    "Results are rounded for readability; add a buffer before ordering, booking, or committing.",
    "Double-check anything with a real cost attached against a local quote."
  ],
  "faq": [
    {
      "q": "What's a good embodied carbon target per square foot?",
      "a": "Leading low-carbon commercial projects target 8-12 kg CO2e/sq ft for structure and enclosure; a conventional concrete-and-steel building typically lands 15-25+ kg CO2e/sq ft. Several city embodied-carbon ordinances (Colorado's HB21-1286-driven building codes, for example) are starting to set enforceable ceilings in this range for new large buildings."
    },
    {
      "q": "How much does fly ash or slag replacement actually cut concrete's footprint?",
      "a": "Replacing 25-40% of Portland cement with fly ash or slag cement can cut a concrete mix's embodied carbon by roughly 20-40%, since cement clinker production is the dominant emissions source in concrete, not the aggregate or water. It's one of the cheapest embodied-carbon reduction levers available on a typical project."
    },
    {
      "q": "Why does structural steel have such a high GWP factor per ton?",
      "a": "Steel GWP varies enormously by production route — electric arc furnace (recycled scrap) steel runs closer to 700-900 kg CO2e/ton, while basic oxygen furnace (virgin ore) steel runs 1,800-2,500+. Specifying EAF steel with high recycled content is one of the single highest-impact embodied-carbon decisions on a structural project."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/green-building-certification-cost",
    "https://www.revenuelab.fyi/toolbox/packaging-reduction-savings",
    "https://www.revenuelab.fyi/toolbox/supply-chain-emissions-intensity"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Embodied Carbon of Materials Calculator (https://www.revenuelab.fyi/toolbox/embodied-carbon-materials)"
}