{
  "slug": "burn-tbsa",
  "title": "Burn TBSA & Fluid Resuscitation Calculator",
  "heading": "Burn TBSA Calculator",
  "category": "fitness-health",
  "url": "https://www.revenuelab.fyi/toolbox/burn-tbsa",
  "summary": "Rule of nines total body surface area and Parkland fluid volume.",
  "description": "Sum burned body regions using the rule of nines, then apply the Parkland formula to estimate the crystalloid volume for the first 24 hours and the first 8-hour rate.",
  "formula": "Parkland: 4 mL × kg × %TBSA, half in the first 8 hours.",
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=burn-tbsa",
  "inputs": [
    {
      "id": "tbsa",
      "label": "Burned surface area",
      "kind": "number",
      "hint": null,
      "default": 25,
      "unit": "% TBSA",
      "min": 0,
      "max": 100
    },
    {
      "id": "kg",
      "label": "Body weight",
      "kind": "number",
      "hint": null,
      "default": 80,
      "unit": "kg",
      "min": 2,
      "max": null
    },
    {
      "id": "factor",
      "label": "Formula",
      "kind": "select",
      "hint": null,
      "default": "4",
      "options": [
        {
          "value": "4",
          "label": "Parkland (4 mL/kg/%)"
        },
        {
          "value": "2",
          "label": "Modified Brooke (2 mL/kg/%)"
        },
        {
          "value": "3",
          "label": "ABA consensus (3 mL/kg/%)"
        }
      ]
    },
    {
      "id": "elapsed",
      "label": "Hours since injury",
      "kind": "number",
      "hint": null,
      "default": 2,
      "unit": null,
      "min": 0,
      "max": 8
    }
  ],
  "outputs": [
    {
      "id": "total",
      "label": "24-hour fluid volume (mL)",
      "format": "number",
      "hint": null,
      "primary": true
    },
    {
      "id": "first8",
      "label": "First 8 hours (mL)",
      "format": "number",
      "hint": null,
      "primary": false
    },
    {
      "id": "rateNow",
      "label": "Current rate to catch up (mL/hr)",
      "format": "number",
      "hint": null,
      "primary": false
    },
    {
      "id": "next16Rate",
      "label": "Hours 8–24 rate (mL/hr)",
      "format": "number",
      "hint": null,
      "primary": false
    },
    {
      "id": "urineTarget",
      "label": "Urine output target (mL/hr)",
      "format": "decimal",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Burned surface area: 25 % TBSA",
      "Body weight: 80 kg",
      "Formula: Parkland (4 mL/kg/%)",
      "Hours since injury: 2"
    ],
    "outputs": [
      "24-hour fluid volume (mL): 8,000",
      "First 8 hours (mL): 4,000",
      "Current rate to catch up (mL/hr): 667",
      "Hours 8–24 rate (mL/hr): 250",
      "Urine output target (mL/hr): 40"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter burned surface area (% TBSA).",
      "Enter body weight (kg).",
      "Enter formula.",
      "Enter hours since injury.",
      "Read your 24-hour fluid volume (ml) 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": {
        "tbsa": 15,
        "kg": 48,
        "factor": "4",
        "elapsed": 1.2
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "tbsa": 25,
        "kg": 80,
        "factor": "4",
        "elapsed": 2
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "tbsa": 40,
        "kg": 128,
        "factor": "4",
        "elapsed": 3.2
      }
    }
  ],
  "limitations": [
    "Population formulas describe averages; individual bodies vary, especially at the extremes of height, age, or muscle mass.",
    "Results do not account for medical conditions, medication, or pregnancy.",
    "Use this as a directional reference, not a diagnosis — talk to a clinician before acting on it."
  ],
  "faq": [
    {
      "q": "Is the clock from arrival or injury?",
      "a": "From the time of injury, which is why elapsed time raises the catch-up rate."
    },
    {
      "q": "What guides titration?",
      "a": "Urine output, typically 0.5 mL/kg/hr in adults. The formula is a starting point, not a prescription."
    }
  ],
  "related": [],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Burn TBSA & Fluid Resuscitation Calculator (https://www.revenuelab.fyi/toolbox/burn-tbsa)"
}