Vent Mechanics Calculator

Airway Pressures

P-peak cmH₂O

Peak inspiratory pressure — read directly from vent display

Enter a value between 1–80 cmH₂O

P-plat cmH₂O

Plateau pressure — 2-second inspiratory hold, passive patient

P-plat cannot exceed P-peak — check your values

Enter a value between 1–80 cmH₂O

PEEP cmH₂O

Set PEEP

Enter a value between 0–30 cmH₂O

Volume & Flow

VTe mL

Expired tidal volume — use VTe not VTi

Enter a value between 50–2000 mL

Peak Flow L/min — NOT L/s

Read directly from vent display or freeze-frame flow-time scalar

Enter a value between 1–200 L/min

All values assume passive ventilation. Spontaneous respiratory effort during inspiratory hold invalidates plateau pressure and all derived calculations.

Static Compliance

Respiratory system
(lung + chest wall)

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mL/cmH₂O

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Formula: VTe ÷ (P-plat − PEEP)

Airway Resistance

Peak flow converted
L/min → L/s internally

—

cmH₂O/L/s

—

Formula: (P-peak − P-plat) ÷ peak flow (L/s)

Driving Pressure

Target ≤14 cmH₂O
LUNG-SAFE / Amato NEJM 2015

P-plat > 30 cmH₂O — above ARDSnet target

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cmH₂O

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Formula: P-plat − PEEP

This calculator is intended as a clinical research and educational tool. It should not be used in isolation or acted upon without oversight by an experienced physician.