Use Elastance Calculator when you need to compute respiratory elastance as transpulmonary pressure divided by tidal volume in liters. Enter Transpulmonary pressure and Tidal volume using the definitions and units below so the result can be reproduced.

Transpulmonary pressure

A finite measured or assumed value, expressed in cmH2O.

Tidal volume

A finite measured or assumed value, expressed in L.

The published tool contract uses this rule: Compute respiratory elastance as transpulmonary pressure divided by tidal volume in liters.^[1]

Elastance

The calculated elastance in cmH2O/L.

A ratio or percentage can conceal the scale of its numerator and denominator and becomes sensitive to measurement error when the denominator is small. It is informational and cannot diagnose a condition, select treatment, or replace professional interpretation of the original measurements.

Retain the original Transpulmonary pressure and Tidal volume values and their units alongside the result. Dynamic Compliance is useful when you instead need to compute dynamic respiratory compliance as tidal volume divided by peak inspiratory pressure minus PEEP. Static Compliance provides another view by helping you compute static respiratory compliance as tidal volume divided by plateau pressure minus PEEP.

• Dynamic Compliance

  Compute dynamic respiratory compliance as tidal volume divided by peak inspiratory pressure minus PEEP.

• Static Compliance

  Compute static respiratory compliance as tidal volume divided by plateau pressure minus PEEP.

• Total Compliance

  Compute total respiratory system compliance as exhaled tidal volume divided by the driving pressure between plateau pressure and total PEEP.