{
  "slug": "weld-rod-consumption",
  "title": "Weld Rod / Wire Consumption Calculator",
  "heading": "Welding Rod & Wire Consumption Calculator",
  "category": "other",
  "url": "https://www.revenuelab.fyi/toolbox/weld-rod-consumption",
  "summary": "Estimate filler metal weight and cost needed for a weld job.",
  "description": "Filler metal consumption is driven by weld length, bead size (leg size for fillets, or cross-sectional area for grooves), deposition efficiency (how much of the rod/wire actually becomes weld metal versus spatter, stub loss, or slag for stick welding), and the density of the filler alloy. Deposition efficiency varies a lot by process: SMAW (stick) runs 55-65% due to stub loss and slag, GMAW (MIG) solid wire runs 92-98%, flux-cored (FCAW) runs 80-90%, and TIG with filler rod runs close to 95%+ since there's minimal waste. This calculator estimates required filler weight from weld length and an assumed weight-per-foot for the joint size (a standard reference value you can adjust for your specific joint geometry), divides by deposition efficiency to account for waste, and converts to cost using your rod/wire price per pound. Use this for material planning on a job or to sanity-check a weld cost estimate against a competing quote.",
  "formula": "Required Deposited Weight = Weld Length × Weight per Foot (by joint size). Filler Purchased = Deposited Weight ÷ Deposition Efficiency. Cost = Filler Purchased (lb) × Price per lb.",
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=weld-rod-consumption",
  "inputs": [
    {
      "id": "weldLengthFt",
      "label": "Total weld length",
      "kind": "number",
      "hint": null,
      "default": 40,
      "unit": "ft",
      "min": 0.1,
      "max": null
    },
    {
      "id": "weightPerFt",
      "label": "Deposited weight per foot (by joint/leg size)",
      "kind": "number",
      "hint": null,
      "default": 0.135,
      "unit": "lb/ft",
      "min": 0.001,
      "max": null
    },
    {
      "id": "process",
      "label": "Welding process",
      "kind": "select",
      "hint": null,
      "default": "0.95",
      "options": [
        {
          "value": "0.6",
          "label": "SMAW (Stick) — ~60% efficiency"
        },
        {
          "value": "0.95",
          "label": "GMAW (MIG) solid wire — ~95%"
        },
        {
          "value": "0.85",
          "label": "FCAW (Flux-cored) — ~85%"
        },
        {
          "value": "0.97",
          "label": "GTAW (TIG) — ~97%"
        }
      ]
    },
    {
      "id": "pricePerLb",
      "label": "Filler metal price",
      "kind": "number",
      "hint": null,
      "default": 5.2,
      "unit": "$/lb",
      "min": 0,
      "max": null
    }
  ],
  "outputs": [
    {
      "id": "purchased",
      "label": "Filler metal needed (purchase weight)",
      "format": "decimal",
      "hint": null,
      "primary": true
    },
    {
      "id": "cost",
      "label": "Estimated filler metal cost",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "deposited",
      "label": "Actual deposited weld metal weight",
      "format": "decimal",
      "hint": null,
      "primary": false
    },
    {
      "id": "waste",
      "label": "Waste (spatter/stub/slag loss)",
      "format": "decimal",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Total weld length: 40 ft",
      "Deposited weight per foot (by joint/leg size): 0.135 lb/ft",
      "Welding process: GMAW (MIG) solid wire — ~95%",
      "Filler metal price: 5.2 $/lb"
    ],
    "outputs": [
      "Filler metal needed (purchase weight): 5.68",
      "Estimated filler metal cost: $29.56",
      "Actual deposited weld metal weight: 5.4",
      "Waste (spatter/stub/slag loss): 0.28"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter total weld length (ft).",
      "Enter deposited weight per foot (by joint/leg size) (lb/ft).",
      "Enter welding process.",
      "Enter filler metal price ($/lb).",
      "Read your filler metal needed (purchase weight) 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": {
        "weldLengthFt": 24,
        "weightPerFt": 0.081,
        "process": "0.95",
        "pricePerLb": 3.12
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "weldLengthFt": 40,
        "weightPerFt": 0.135,
        "process": "0.95",
        "pricePerLb": 5.2
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "weldLengthFt": 64,
        "weightPerFt": 0.21600000000000003,
        "process": "0.95",
        "pricePerLb": 8.32
      }
    }
  ],
  "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": "How do I find weight-per-foot for my joint size?",
      "a": "AWS welding handbooks and filler metal manufacturer charts list deposited weight per foot by fillet leg size and groove weld dimensions — for reference, a 1/4-inch fillet weld runs roughly 0.135 lb/ft, and weight scales roughly with the square of leg size, so a 3/8-inch fillet needs about 2.25x the filler of a 1/4-inch fillet."
    },
    {
      "q": "Why is stick welding so much less efficient?",
      "a": "Stick electrodes leave a stub end (typically 1.5-2 inches) that gets discarded, plus slag and spatter losses during the arc. MIG and TIG have essentially no stub loss and much less spatter, which is a major reason shops switch to MIG/FCAW for high-volume production welding despite stick's portability advantages."
    },
    {
      "q": "Does this account for multi-pass welds?",
      "a": "Yes, as long as your weight-per-foot figure already reflects the total deposited weight for the full joint (all passes combined), which is how most reference charts present the data for a given final weld size. If you're calculating pass-by-pass, sum each pass's deposited weight separately before dividing by efficiency."
    },
    {
      "q": "How much filler should I buy above the calculated amount?",
      "a": "Add 10-15% buffer for rework, tack welds, and practice/setup passes beyond what this calculator shows, especially for a new welder or first run of a new joint design, since first-pass yield is rarely 100% on a new setup."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/shop-labor-burden-rate",
    "https://www.revenuelab.fyi/toolbox/scrap-rework-cost"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Weld Rod / Wire Consumption Calculator (https://www.revenuelab.fyi/toolbox/weld-rod-consumption)"
}