Maintenance IV Fluids (Holliday-Segar) — free guideline decision tool
Calculate maintenance IV fluid requirements with the Holliday-Segar method.
Open guideline tool →Guideline-based
Implements the decision logic from published clinical guidelines.
Runs in your browser
No installation. Enter the patient's values and get a guideline recommendation instantly.
Data stays local
Nothing is uploaded. Results are for licensed clinicians only.
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Weight | 24 kg |
|---|
→Maintenance rate64mL/h
- Daily volume：1580 mL/day
- Rule：Daily 100/50/20 mL/kg; hourly 4/2/1 mL/kg
Common questions
What is Maintenance IV Fluids (Holliday-Segar)?
Calculate maintenance IV fluid requirements with the Holliday-Segar method.
How is Maintenance IV Fluids (Holliday-Segar) calculated? What is the core formula?
Daily: 100 mL/kg (first 10 kg) + 50 (next 10) + 20 (each kg > 20). Hourly (4-2-1): 4 + 2 + 1 mL/kg.
When is Maintenance IV Fluids (Holliday-Segar) used?
Maintenance fluids in children and adults (euvolaemic).
What are the key clinical points for Maintenance IV Fluids (Holliday-Segar)?
For maintenance only — add deficits and ongoing losses. Use isotonic fluids; monitor sodium, especially in children. Reassess frequently in acute illness.
What are the limits and cautions when using Maintenance IV Fluids (Holliday-Segar)?
For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
How is Maintenance IV Fluids (Holliday-Segar) calculated in practice? Can you show a worked example?
Inputs: Weight 24 kg → Result: Maintenance rate 64 mL/h（Daily volume: 1580 mL/day, Rule: Daily 100/50/20 mL/kg; hourly 4/2/1 mL/kg）
Run Maintenance IV Fluids (Holliday-Segar) now
Calculate maintenance IV fluid requirements with the Holliday-Segar method.
Open guideline tool →For licensed clinicians. Not a substitute for clinical judgement.
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