{"uid":"cap_-d6fwDYVt9JhdRwKzyrGW","slug":"holliday-segar-maintenance-fluid-calculator-c9faa02e","name":"Holliday-Segar Maintenance Fluid Calculator","description":"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.","url":"https://api.magentlab.com/api/calc/maintenance_fluids","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"headers":{"type":"object","additionalProperties":{"type":"string"}},"queryParams":{"type":"object","required":[],"properties":{"weight_kg":{"type":"number","description":"Weight in kilograms. Provide weight_kg or weight_lb."},"weight_lb":{"type":"number","description":"Weight in pounds. Converted as kg = lb * 0.45359237."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"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"}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_DXZ1TQN8mn-kLddJ1YFfe","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"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","exampleAgentPrompt":"Calculate the Holliday-Segar daily and hourly maintenance fluid requirements for a patient who weighs 23 kg.","exampleUseCases":[{"title":"Pediatric dosing double-check","prompt":"What are the Holliday-Segar maintenance fluid volumes — daily and hourly — for a 12 kg toddler?"},{"title":"Weight in pounds conversion","prompt":"My patient weighs 66 pounds — can you work out their daily and hourly maintenance fluid requirements using the Holliday-Segar formula?"},{"title":"Adult baseline fluid estimation","prompt":"Use the 100/50/20 rule to figure out how much maintenance fluid a 70 kg adult would need per day and per hour."}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T01:11:44.694Z","isFirstParty":false}