Maintenance Fluid Calculator
Calculate daily fluid requirements and hourly infusion rates using the Holliday-Segar formula for pediatric and adult patients
Calculation Breakdown
Formula Used
Maintenance fluid calculations are essential in clinical practice to determine the appropriate amount of intravenous fluids needed to maintain normal physiological functions. The Holliday-Segar method, developed in 1957, remains the gold standard for calculating maintenance fluid requirements in pediatric patients and is widely used across different age groups.
The formula is based on metabolic rate and energy expenditure, using body weight as a proxy. For pediatric patients over 28 days, the calculation follows a tiered approach: 100 mL/kg/day for the first 10 kg, 50 mL/kg/day for the next 10 kg, and 20 mL/kg/day for weight above 20 kg. Neonates require different calculations based on their age in days, while adults typically need 25-30 mL/kg/day.
Proper fluid management is crucial for maintaining electrolyte balance, supporting organ function, and preventing complications such as dehydration or fluid overload. Healthcare providers must consider individual patient factors, clinical condition, and ongoing losses when prescribing maintenance fluids.
How to Use the Fluid Maintenance Calculator
Step 1: Select Patient Type
Choose the appropriate patient category from the dropdown menu. Select “Pediatric” for patients older than 28 days, “Neonate” for patients less than 28 days old, or “Adult” for adult patients. Each category uses different calculation methods based on physiological requirements.
Step 2: Enter Patient Weight
Input the patient’s current weight in kilograms in the designated field. Ensure accuracy as the calculation is weight-dependent. The calculator accepts decimal values for precise measurements.
Step 3: Specify Age for Neonates
If you selected “Neonate” as the patient type, choose the appropriate age range from the dropdown menu. Neonatal fluid requirements vary significantly based on postnatal age, with different rates for birth to day 1, day 2, day 3, day 4, and days 5-28.
Step 4: Calculate and Review Results
Click the calculate button to generate the maintenance fluid requirements. The results will display both daily total volume and hourly infusion rate, along with recommended electrolyte concentrations. Review the calculation explanation to understand how the values were derived using the appropriate formula for the selected patient type.