Respiratory Calculators
17 evidence-based respiratory calculators for pediatric and neonatal care.
Minute Ventilation
Calculate minute ventilation from respiratory rate and tidal volume.
A-a Gradient
Alveolar-arterial oxygen gradient for assessing oxygenation efficiency.
PAO2 (Alveolar O2)
Calculate alveolar partial pressure of oxygen using the alveolar gas equation.
Oxygen Content (CaO2)
Calculate arterial oxygen content from hemoglobin, saturation, and PaO2.
Oxygen Extraction Ratio
Determine the fraction of oxygen extracted from arterial blood.
Oxygen Index (OI)
Assess severity of hypoxemic respiratory failure in neonates.
Tidal Volume (Vt)
Estimate tidal volume range based on patient weight and age category.
Inspiratory Time (Ti)
Calculate inspiratory time from respiratory rate and I:E ratio.
Peak Inspiratory Pressure
Estimate PIP from tidal volume, compliance, and PEEP.
PEEP Reference
ARDSNet PEEP/FiO2 table and guidelines for PEEP settings.
Respiratory Rate
Normal respiratory rate reference ranges by age group.
Dead Space (Vd/Vt)
Bohr equation for dead space-to-tidal volume ratio calculation.
Static Compliance
Calculate static lung compliance from plateau pressure and PEEP.
Dynamic Compliance
Calculate dynamic compliance from PIP, PEEP, and tidal volume.
Airway Resistance
Calculate airway resistance from PIP, plateau pressure, and flow rate.
Work of Breathing
Estimate work of breathing from compliance, resistance, and ventilation parameters.
ETT Size & Depth
Endotracheal tube size and insertion depth by age and weight.