Free Residual Lung Volume (RV) Calculator for Freediving

Estimate Your Residual Volume and Understand Lung Compression at Depth

Residual volume (RV) is the amount of air remaining in the lungs after a maximal exhalation.

In freediving, understanding residual volume helps explain the relationship between lung volumes, pressure, and depth.

Our free online calculator provides an educational estimate to help you explore these concepts as part of your freediving theory training.

How to Use the RV Calculator

Enter the information requested by the calculator.
Calculate your estimated lung volume.
Review your result as an educational reference.

Important: Actual residual volume requires specialized measurement techniques. This calculator does not replace pulmonary function testing or determine safe diving depths.

Learn more about freediving physiology and technique through our AIDA courses in Dahab.

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