Understanding Maintenance Fluid Calculations and the 4-2-1 Rule
Calculating intravenous maintenance fluids is essential for hospitalized patients unable to maintain adequate oral intake. The classic 4-2-1 Rule (Holliday-Segar method) provides a reliable estimation of hourly fluid needs based on body weight tiers. Our advanced Free Online Advanced Maintenance Fluid Calculator computes hourly infusion rates and total daily volumes instantly for both adult and paediatric patients.
Why Individualize Fluid Prescription?
Baseline fluid calculations provide a starting point. Clinical conditions such as fever, surgery, renal impairment, cardiac status, and electrolyte shifts require careful monitoring and individualized adjustments to prevent fluid overload or dehydration.