Respiratory

Dynamic Compliance Calculator

Tidal volume over peak pressure minus PEEP; unlike static compliance it also reflects airway resistance.

Reviewed by Alex G, BSN, RN, CEN, CCRN, CMC, NREMT-P · From the Reference tab of the app

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Formula

Vt / (PIP - PEEP)

How it is used

• Dynamic compliance uses peak pressure, so it falls with airway resistance as well as with stiff lungs; static compliance (plateau pressure) reflects the lungs and chest wall alone.
• Peak minus plateau is the resistive pressure; over about 10 cm H₂O is high: suction, a bite block or a bronchodilator.
• Dynamic falling with static steady: a resistance problem (secretions, a kinked or bitten tube, bronchospasm). Both falling: a compliance problem (ARDS, edema, pneumothorax, mainstem intubation, abdominal distension).

Same formula as the app. Open it in the web app.

Related one-pagers

• Ventilator Modes and SettingsDynamic compliance · Vt ÷ (peak − PEEP) · Lower than static; falls with either load
• ABG Interpretation in 6 Steps

Related calculators

• A-a Gradient
• Alveolar Gas Equation (PAO₂)
• Arterial Oxygen Content (CaO₂)
• Dead Space Fraction (Bohr)
• Driving Pressure
• Minute Ventilation
• O₂ Extraction Ratio
• Oxygen Consumption (VO₂)

For education and exam preparation only. Follow your institution’s protocols. For education and exam preparation only. Verify results independently and follow your institution’s protocols. Not a substitute for clinical judgment.