LIVE

Parkland crystalloid volume

Parkland formula

Compute adult Parkland 24-hour crystalloid volume from weight and percent TBSA, with half allotted to the first 8 hours from the time of burn.

Also searched as

• Parkland formula
• burn crystalloid volume
• 4 mL kg TBSA
• Baxter Parkland
• 24 hour burn fluids
• first 8 hours Parkland
• TBSA fluid resuscitation

LIVE $0.005 USDC GET /api/calc/parkland

Markdown: /docs/parkland.md · Canonical: https://magentlab.com/docs/parkland

Not a medical device. Not a diagnosis, dose, or listing recommendation.

What it computes

Compute adult Parkland 24-hour crystalloid volume from weight and percent TBSA, with half allotted to the first 8 hours from the time of burn.

When to use

When an agent needs the adult Parkland 4 mL/kg/%TBSA 24-hour crystalloid split and must not invent a burn-fluid volume or apply modified Brooke (2 mL) or pediatric Galveston formulas.

When not to use

• Adult 4 mL/kg/%TBSA Parkland crystalloid only. Does not implement modified Brooke (2 mL) or pediatric Galveston formulas.
• Not a treatment order or IV prescription. magent does not titrate to urine output or choose fluid type.
• The first 8 hours are counted from the time of burn, not from arrival. This tool does not take elapsed time since injury.

Formula

volume_24h_ml = 4 * weight_kg * tbsa_percent; first_8h_ml = volume_24h_ml / 2; remaining_16h_ml = volume_24h_ml / 2

Citation

Title

Fluid volume and electrolyte changes of the early postburn period

Authors

Baxter CR

Source

Clin Plast Surg. 1974;1(4):693-703

DOI

10.1016/S0094-1298(20)30126-7

Worked example

Try

Opens the live endpoint. Unpaid browser requests show the paywall; agents should send Accept: application/json.

/api/calc/parkland?weight_kg=70&tbsa_percent=50

Full URL: https://api.magentlab.com/api/calc/parkland?weight_kg=70&tbsa_percent=50

Call

Expect HTTP 402 until you retry with PAYMENT-SIGNATURE. Incomplete query params return HTTP 400 before any quote or charge.

curl -i -H "Accept: application/json" "https://api.magentlab.com/api/calc/parkland?weight_kg=70&tbsa_percent=50"

Parameters

Bulk (POST)

POST the same path with a JSON items array. Price is n times the GET unit. Invalid items return HTTP 400 before settlement.

POST /api/calc/parkland Max 25 unit_amount * n PREVIEW

• 1 to 25 items. Each item uses the same keys as the GET query parameters.
• The first invalid item fails the whole request (index in the 400 JSON). You are not charged.
• HTTP 200 is {count, path, items}. Each items[i] is the GET 200 body for that row.
• Catalog misses (empty matches, found=false) stay paid 200s inside that slot.
• x402 resource URL is this path plus n and body_sha256. Browsers that prefer text/html get the same paywall as GET; Pay retries POST with the same items.

Example request (fixture)

{
  "items": [
    {
      "tbsa_percent": "50",
      "weight_kg": "70"
    },
    {
      "tbsa_percent": "50",
      "weight_kg": "70"
    }
  ]
}

Open bulk paywall →

Opens a two-item fixture on the API host. Unpaid browsers get the same MetaMask paywall as GET; Pay retries POST with those items.

Example 200 (fixture)

{
  "count": 2,
  "path": "/api/calc/parkland",
  "items": [
    {
      "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
      "citation": {
        "authors": "Baxter CR",
        "doi": "10.1016/S0094-1298(20)30126-7",
        "id": "baxter-1974",
        "source": "Clin Plast Surg. 1974;1(4):693-703",
        "title": "Fluid volume and electrolyte changes of the early postburn period"
      },
      "formula": "parkland",
      "formula_expression": "volume_24h_ml = 4 * weight_kg * tbsa_percent; first_8h_ml = volume_24h_ml / 2; remaining_16h_ml = volume_24h_ml / 2",
      "weight_kg": 70.0,
      "first_8h_ml": 7.0e3,
      "remaining_16h_ml": 7.0e3,
      "tbsa_percent": 50.0,
      "volume_24h_ml": 1.4e4
    },
    {
      "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
      "citation": {
        "authors": "Baxter CR",
        "doi": "10.1016/S0094-1298(20)30126-7",
        "id": "baxter-1974",
        "source": "Clin Plast Surg. 1974;1(4):693-703",
        "title": "Fluid volume and electrolyte changes of the early postburn period"
      },
      "formula": "parkland",
      "formula_expression": "volume_24h_ml = 4 * weight_kg * tbsa_percent; first_8h_ml = volume_24h_ml / 2; remaining_16h_ml = volume_24h_ml / 2",
      "weight_kg": 70.0,
      "first_8h_ml": 7.0e3,
      "remaining_16h_ml": 7.0e3,
      "tbsa_percent": 50.0,
      "volume_24h_ml": 1.4e4
    }
  ]
}

Response

Example JSON

Machine form of the same example. Frozen fixture. Not a live lookup.

{
  "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
  "citation": {
    "authors": "Baxter CR",
    "doi": "10.1016/S0094-1298(20)30126-7",
    "id": "baxter-1974",
    "source": "Clin Plast Surg. 1974;1(4):693-703",
    "title": "Fluid volume and electrolyte changes of the early postburn period"
  },
  "formula": "parkland",
  "formula_expression": "volume_24h_ml = 4 * weight_kg * tbsa_percent; first_8h_ml = volume_24h_ml / 2; remaining_16h_ml = volume_24h_ml / 2",
  "weight_kg": 70.0,
  "first_8h_ml": 7.0e3,
  "remaining_16h_ml": 7.0e3,
  "tbsa_percent": 50.0,
  "volume_24h_ml": 1.4e4
}

Client errors (HTTP 400)

Invalid params return 400 without charge. Shared HTTP 402 and 503 meanings: Payments.

Related tools

• Maintenance fluids — Compute Holliday–Segar 1957 daily maintenance water from weight, plus the corresponding hourly milliliters.

Payment

Required query parameters must be present and valid. Invalid params return HTTP 400 JSON before settlement. magent does not charge. Fix the params, then request a new 402 quote for that complete URL. Catalog misses (empty matches, found=false) are valid paid 200s. Unpaid valid requests return HTTP 402 with a base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote: retry the same PAYMENT-SIGNATURE. Full handshake and shared payment errors: Payments. Stdio MCP: /docs/mcp.

Guarantees

• Invalid query parameters return HTTP 400 before settlement. You are not charged.
• Settlement finishes before the tool executes (paymentFlow upfront). Uncertain or failed settlement fails closed (HTTP 503). Retry the same PAYMENT-SIGNATURE.
• HTTP 402 is unpaid only. Do not sign a second authorization because of a 503.
• Execution is timeout-bounded and concurrency-capped.
• Calculator inputs are stored encrypted for allowlisted operators (Magent Console). They are not in public logs, SSH lookups, catalog, or rollups. Request logs store path without query.