ICU and Critical Care · Anaesthesiology

Mean Airway Pressure (Ventilator) calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

PEEP (cmH2O)

cmH2O

Allowed range: 0–30 cmH2O

Peak inspiratory pressure, PIP (cmH2O)

cmH2O

Allowed range: 5–60 cmH2O

Inspiratory time (s)

Allowed range: 0.3–2 s

Total breath cycle time, 60 / rate (s)

Allowed range: 1–10 s

Airway pressure waveform

Result

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Professional use only

For qualified clinicians. Independently verify inputs, calculations, source guidance, and applicability before any clinical action. This calculator does not replace clinical judgment.

Source: Glenski JA, Marsh HM, Hall RT. Calculation of mean airway pressure during mechanical ventilation in neonates. Crit Care Med. 1984;12(8):642-644. DOI: 10.1097/00003246-198408000-00007. PMID: 6378525. Scope: Mean airway pressure = K × (PIP − PEEP) × (Ti / total cycle time) + PEEP, the area under the airway pressure–time curve per breath. Waveform constant K = 1 for a rectangular (square) pressure wave, as in pressure-controlled breaths, and K = 0.5 for a triangular pressure wave (Glenski et al. compared square, triangular and sine-like waveform equations). Glenski et al. found calculated values varied widely between patients and recommended measuring mean airway pressure when possible. (1984)

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Clinical inputs

PEEP (cmH2O)Accepted range: 0 to 30
Peak inspiratory pressure, PIP (cmH2O)Accepted range: 5 to 60
Inspiratory time (s)Accepted range: 0.3 to 2
Total breath cycle time, 60 / rate (s)Accepted range: 1 to 10
Airway pressure waveform

Primary source

Glenski JA, Marsh HM, Hall RT. Calculation of mean airway pressure during mechanical ventilation in neonates. Crit Care Med. 1984;12(8):642-644. DOI: 10.1097/00003246-198408000-00007. PMID: 6378525. Scope: Mean airway pressure = K × (PIP − PEEP) × (Ti / total cycle time) + PEEP, the area under the airway pressure–time curve per breath. Waveform constant K = 1 for a rectangular (square) pressure wave, as in pressure-controlled breaths, and K = 0.5 for a triangular pressure wave (Glenski et al. compared square, triangular and sine-like waveform equations). Glenski et al. found calculated values varied widely between patients and recommended measuring mean airway pressure when possible. (1984)

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