Lung volumes/Capacity Calculator

Inspiratory Reserve Volume:
Tidal Volume:
Exspiratory Reserve Volume:
Residual Volume:
Vital Capacity:
Total Lung Capacity:
Inspiratory Capacity:
Functional Residual Capacity:

Lung capacities and Lung volumes refer to the volume of air when you breath.

To an adult man the lung capcity is about 6 litres of air.

Lung capacities in healthy adults
Volume Average value (litres) Derivation
In men In women
Vital capacity 4.6 3.1 IRV plus TV plus ERV
Inspiratory capacity 3.5 2.4 IRV plus TV
Functional residual capacity 2.3 1.8 ERV plus RV
Total lung capacity 5.8 4.2 IRV plus TV plus ERV plus RV
Average lung volumes in healthy adults
Volume Value (litres)
In men In women
Inspiratory reserve volume 3.0 1.9
Tidal volume 0.5 0.5
Expiratory reserve volume 1.1 0.7
Residual volume 1.2 1.1

Lung Capacity Calculator Formulas:

vital capacity = IRV + TV + ERV

total lung capacity = IRV + TV + ERV + RV

inspiratory capacity = TV + IRV

functional residual capacity = ERV + RV

Where TV is Tidal Volume, IRV is Inspiratory Reserve Volume, RV is Residual Volume, ERV is Exspiratory Reserve Volume.

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