Respiratory Calculators

17 calculators for pediatric and neonatal respiratory therapy. Each calculator includes formulas, normal reference ranges, and clinical interpretation.

Showing 17 of 17 calculators

Minute Ventilation (VE)

Calculate minute ventilation from respiratory rate and tidal volume.

Calculate the alveolar-arterial oxygen gradient.

A-a = PAO2 − PaO2

PAO2 Calculator

Calculate partial alveolar oxygen pressure.

PAO2 = FiO2 × (Pb − 47) − (1.2 × PaCO2)

Oxygen Content (CaO2)

Calculate arterial oxygen content.

CaO2 = (SaO2 × 1.34 × Hb) + (0.0031 × PaO2)

Oxygen Extraction

Calculate oxygen extraction ratio.

O2ER = ((CaO2 − CvO2) / CaO2) × 100

Oxygen Index (OI)

Calculate the oxygen index for severity assessment.

OI = (FiO2 × MAP × 100) / PaO2

Tidal Volume (Vt)

Calculate recommended tidal volume based on weight.

Vt = 6 × weight (kg)

Inspiratory Time (Ti)

Calculate inspiratory time from total cycle time.

Ti = 0.4 × cycle time

Peak Inspiratory Pressure (PIP)

Reference values for peak inspiratory pressure by age group.

Reference values for positive end-expiratory pressure.

Respiratory Rate (RR)

Age-based normal respiratory rate reference values.

Dead Space (Vd)

Calculate anatomical dead space volume.

Vd = 2.2 × weight (kg)

Static Compliance (Cstat)

Calculate static lung compliance.

Cstat = TV / (Plateau − PEEP)

Dynamic Compliance (Cdyn)

Calculate dynamic lung compliance.

Cdyn = TV / (PIP − PEEP)

Airway Resistance (Raw)

Calculate airway resistance.

Raw = (PIP − Plateau) / (Flow / 60)

Work of Breathing (WOB)

Calculate mechanical work of breathing.

WOB = Pressure × Volume

ETT Size and Depth

Calculate endotracheal tube size and insertion depth by age.

Uncuffed = (Age/4) + 4 | Cuffed = (Age/4) + 3.5