Closing Capacity (CC) – Alveoli Collapse Volume Calculator

Closing Capacity (CC) is a measure in respiratory medicine that tells us when small airways in the lungs start to collapse during breathing out. It helps to understand how well the lungs are working.

Residual Volume
Closing Volume
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    1 Number of calculations

    CC is calculated as the sum of the closing volume (CV) and residual volume (RV – the amount of air left in the lungs at the end of a maximal expiration).

    Once you have the required values (usually measured at a lung function test), enter them into the online calculator.

    \text{CC} = \text{CV} + \text{RV}


    • CC = Closing capacity
    • RV=Residual Volume (Liters)
    • CV= Closing Volume (Liters