Respiratory Therapy Calculators
Free PulmoLearn calculators for RT students, including oxygenation, ventilation, ventilator mechanics, weaning, neonatal surfactant dosing, and clinical reasoning tools.
Find the Tool You Need
These calculators are grouped by how RT students commonly use them: oxygenation, ventilation, ventilator mechanics, weaning, and NICU/PICU support.
Assess Oxygenation and Oxygen Delivery
Use these tools to connect PaO₂, FiO₂, A-a gradient, CaO₂, oxygen delivery, MAP, OI, OSI, and oxygenation severity.
P/F Ratio Calculator
Calculate PaO₂/FiO₂ and interpret oxygenation impairment severity.
GradientA-a Gradient Calculator
Estimate PAO₂ on room air and calculate the alveolar-arterial oxygen gradient.
O₂ ContentCaO₂ Calculator
Calculate arterial oxygen content using hemoglobin, SaO₂, and PaO₂.
O₂ DeliveryDO₂ Calculator
Calculate oxygen delivery from cardiac output and arterial oxygen content.
OI / OSIOxygenation Index & OSI Calculator
Calculate OI using PaO₂ or OSI using SpO₂ with FiO₂ and MAP.
MAPMean Airway Pressure Calculator
Estimate MAP from pressure and timing inputs and connect it to oxygenation.
Evaluate Ventilation, CO₂ Clearance, and Dead Space
These calculators help distinguish total ventilation from effective alveolar ventilation and wasted ventilation.
Minute Ventilation Calculator
Calculate VE from respiratory rate and tidal volume.
CO₂ ClearanceAlveolar Ventilation Calculator
Calculate effective alveolar ventilation using RR, VT, and dead space.
Dead SpaceDead Space VD/VT Calculator
Calculate physiologic dead space fraction using PaCO₂ and mixed expired CO₂.
Connect Pressure, Volume, Compliance, and Resistance
Use these tools to interpret ventilator mechanics and troubleshoot high pressure alarms, stiff lungs, and resistance problems.
Static Compliance Calculator
Calculate Cstat from VT, plateau pressure, and PEEP.
ComplianceDynamic Compliance Calculator
Calculate Cdyn from VT, PIP, and PEEP.
ResistanceAirway Resistance Calculator
Calculate Raw from PIP, plateau pressure, and flow with L/min conversion.
Vent SetupIBW / Tidal Volume Calculator
Estimate predicted body weight and 4, 6, and 8 mL/kg VT targets.
Support Ventilator Liberation Decisions
Use weaning tools as part of a broader assessment that includes oxygenation, ventilation, mechanics, mental status, airway protection, and endurance.
Neonatal and Pediatric Oxygenation Support
These tools support learning around neonatal surfactant dosing, oxygenation severity, MAP, and support-adjusted oxygenation assessment.
Surfactant Dose Calculator
Estimate surfactant dose volume from patient weight and product-specific mL/kg presets.
NICU / PICUOI / OSI Calculator
Calculate oxygenation severity using PaO₂ or SpO₂ with FiO₂ and MAP.
PressureMean Airway Pressure Calculator
Estimate MAP and connect ventilator pressure-time support to oxygenation.
Want to Understand the Clinical Reasoning Behind the Numbers?
PulmoLearn connects calculations to ABGs, oxygenation, ventilator management, neonatal respiratory care, disease recognition, and NBRC-style clinical reasoning.