💧 Maintenance IV Fluids (Holliday-Segar)
Calculate maintenance IV fluid requirements with the Holliday-Segar method.
Maintenance IV Fluids (Holliday-Segar)
Weight (kg)
When to use
Maintenance fluids in children and adults (euvolaemic).
How it works
Daily: 100 mL/kg (first 10 kg) + 50 (next 10) + 20 (each kg > 20). Hourly (4-2-1): 4 + 2 + 1 mL/kg.
Key points
- For maintenance only — add deficits and ongoing losses.
- Use isotonic fluids; monitor sodium, especially in children.
- Reassess frequently in acute illness.
References
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.