Paediatric Fluid Calculator
Paediatric Maintenance & Deficit Fluid
Use ideal body weight for obese children.
Dehydration
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Maintenance (Holliday-Segar):
First 10 kg: 100 ml/kg/day (4 ml/kg/hr)
Next 10 kg: 50 ml/kg/day (2 ml/kg/hr)
All additional kg: 20 ml/kg/day (1 ml/kg/hr)
Deficit:
Deficit (ml) = (% dehydration ÷ 100) × weight (kg) × 1000
Give over 24 hours.
For reference only — verify against the source CPG and confirm with a senior before clinical use. Source: Holliday MA, Segar WE. The maintenance need for water in parenteral fluid therapy. Pediatrics. 1957;19(5):823–832.. Last reviewed: 2026-07-12.