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Holliday-Segar Maintenance Fluid Calculator
x402
Holliday-Segar Maintenance Fluid Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Calculates daily and hourly pediatric/adult maintenance fluid requirements using the Holliday-Segar 1957 method (100/50/20 mL/kg rule) from patient weight in kg or lb
Price / call$0.005
Success—
StatusUnknown
How this service works
Holliday–Segar 1957 daily maintenance water from weight: 100 mL/kg for the first 10 kg, 50 mL/kg for the next 10 kg, 20 mL/kg thereafter. Returns daily and hourly milliliters. Deterministic published arithmetic with citation; not a treatment order or IV prescription.
Output
Returns the calculated daily maintenance fluid volume in milliliters (mL/day) and the hourly rate (mL/hr), derived deterministically from the Holliday-Segar 1957 formula: 100 mL/kg for the first 10 kg, 50 mL/kg for the next 10 kg, and 20 mL/kg for weight beyond 20 kg. The response includes a citation reference. Not a treatment order or prescription.
Example use cases
Pediatric dosing double-check
“What are the Holliday-Segar maintenance fluid volumes — daily and hourly — for a 12 kg toddler?”
Weight in pounds conversion
“My patient weighs 66 pounds — can you work out their daily and hourly maintenance fluid requirements using the Holliday-Segar formula?”
Adult baseline fluid estimation
“Use the 100/50/20 rule to figure out how much maintenance fluid a 70 kg adult would need per day and per hour.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/maintenance_fluidsWhen to prefer
Choose this endpoint when you need a fast, deterministic, citeable Holliday-Segar maintenance fluid calculation from patient weight. Ideal for clinical decision support tools, EHR integrations, or medical education apps that need the published 100/50/20 rule applied precisely. Prefer this over manual calculation to avoid arithmetic errors and to have an auditable formula citation. Accepts both kg and lb inputs directly.
Side effects
- Missing both weight_kg and weight_lb parameters — returns error requiring at least one weight input
- Negative or zero weight value — likely returns a validation error
- Extremely high weight values may produce results outside clinically meaningful ranges but no guardrails are described
- Network or payment failure (402 x402 protocol) if USDC payment is not settled
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/maintenance_fluids",
"count": 2,
"items": [
{
"formula": "holliday_segar",
"citation": {
"id": "holliday-segar-1957",
"doi": "10.1542/peds.19.5.823",
"title": "The maintenance need for water in parenteral fluid therapy",
"source": "Pediatrics. 1957;19(5):823-832",
"authors": "Holliday MA, Segar WE"
},
"daily_ml": 1700,
"hourly_ml": 70.8,
"weight_kg": 30,
"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.",
"formula_expression": "daily_ml = 100*min(kg,10) + 50*max(0, min(kg,20)-10) + 20*max(0, kg-20); hourly_ml = daily_ml / 24"
},
{
"formula": "holliday_segar",
"citation": {
"id": "holliday-segar-1957",
"doi": "10.1542/peds.19.5.823",
"title": "The maintenance need for water in parenteral fluid therapy",
"source": "Pediatrics. 1957;19(5):823-832",
"authors": "Holliday MA, Segar WE"
},
"daily_ml": 1700,
"hourly_ml": 70.8,
"weight_kg": 30,
"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.",
"formula_expression": "daily_ml = 100*min(kg,10) + 50*max(0, min(kg,20)-10) + 20*max(0, kg-20); hourly_ml = daily_ml / 24"
}
]
}
}Tags
x402
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