Page 252 - 2026 SMOG

USEFUL CALCULATIONS
Pediatric Formulas
• ETT Size = (Age/4) + 4
• ETT Depth = 3 × ETT Size (Endotracheal)
• Weight inkg (>1 year) = (Age (years) × 2) + 8
• Systolic BP minimum = 70 + (Age (years) × 2)
Medication Formulas
• mcg/kg/min (micrograms/kilogram/minute) = [16.7 × drug concentration (mg/mL) ×
infusion rate (mL/hr)] × weight (kg)
• Infusion rate (mL/hr) = [desired mcg/kg/min × weight (kg) × 60]/drug concentration
(mcg/mL)
Hemodynamic Formulas
• MAP (Mean Arterial Pressure) = [(2 × DBP) + SBP]/3
• Pulse Pressure = SBP-DBP
• Cerebral Perfusion Pressure (CPP) = MAP-ICP
• Ideal CPP = 60–70
Common Conversions
• lbs = kg × 2.2
• Kg = lbs × 0.45
• Fahrenheit = (Celsius × 1.8) + 32
• Celsius = (Fahrenheit – 32) × 5/9
• 1 tsp = 5mL
• 1 tbsp = 15mL
• 1 oz = 30mL
• 1g = 1,000mg
• 1mg = 1,000mcg
• 1g = 10,000mcg

244 • REFERENCE