**Introduction** Determining the daily maintenance fluid requirements for pediatric patients is essential in clinical practice to ensure proper hydration and physiological function. The calculation is based on the child's weight, and the most commonly used method is the Holliday-Segar formula. **Understanding the Holliday-Segar Formula** The Holliday-Segar formula is a widely accepted method for calculating daily maintenance fluids for children. It is based on the principle that fluid requirements are related to metabolic rate, which correlates with body weight. The formula divides the calculation into three weight categories: - For the first 10 kg of body weight: 100 mL/kg/day - For the next 10 kg (11-20 kg): 50 mL/kg/day - For any weight over 20 kg: 20 mL/kg/day **Step-by-Step Calculation** Let's break down the calculation for a child weighing 36 kg: 1. **First 10 kg:** 10 kg × 100 mL/kg = 1000 mL 2. **Next 10 kg (11-20 kg):** 10 kg × 50 mL/kg = 500 mL 3. **Remaining weight (above 20 kg, which is 16 kg):** 16 kg × 20 mL/kg = 320 mL **Total Daily Maintenance Fluid Requirement** Now, sum up all the values: 1000 mL (first 10 kg) + 500 mL (next 10 kg) + 320 mL (remaining 16 kg) = 1820 mL **Conclusion** Therefore, the daily maintenance fluid requirement for a child who weighs 36 kg is: **1820**