IV Fluid Calculator

Maintenance fluids, deficit & Holliday-Segar method

⚙️ Select Calculation

Weight (kg)

Age Group

Over Period (hours)

Adjustment Factor

mL/day

📊 Holliday-Segar Method Reference

Body Weight	Hourly Rate	Daily Rate
First 10 kg	4 mL/kg/hr	100 mL/kg/day
Next 10 kg (10-20)	2 mL/kg/hr	50 mL/kg/day
Each kg above 20	1 mL/kg/hr	20 mL/kg/day

Example: 25 kg child

First 10 kg: 10 × 4 = 40 mL/hr
Next 10 kg: 10 × 2 = 20 mL/hr
Remaining 5 kg: 5 × 1 = 5 mL/hr
Total: 65 mL/hr = 1,560 mL/day

💧 Fluid Deficit Signs

Mild (3-5%)

Dry mucous membranes
Slightly decreased urine
Normal vital signs
Cap refill <2 sec

Moderate (6-9%)

Tachycardia
Decreased skin turgor
Sunken eyes/fontanelle
Oliguria

Severe (10%+)

Hypotension
Altered mental status
Anuria
Shock - emergency!

Replace 1/2 in first 8h

Then 1/2 over next 16h
Add maintenance fluids
Monitor electrolytes
Recheck weight

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Disclaimer: Fluid calculations are estimates. Individual patient needs vary based on clinical condition, ongoing losses, and organ function. Always monitor intake/output, electrolytes, and weight. Consult protocols for specific conditions like DKA.