Lung Capacity Calculator

Lung capacity is calculated by combining the four measurable lung volumes — and the Lung Capacity Calculator shows you exactly how they add up. Enter your Inspiratory Reserve Volume (IRV), Tidal Volume (TV), Expiratory Reserve Volume (ERV), and Residual Volume (RV) in milliliters to get your Total Lung Capacity (TLC), plus secondary measures including Vital Capacity (VC), Inspiratory Capacity (IC), and Functional Residual Capacity (FRC).

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Extra air inhaled after normal inspiration

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Normal breathing volume at rest

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Extra air exhaled after normal expiration

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Air remaining after maximum expiration

Results

Total Lung Capacity (TLC)

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Vital Capacity (VC)

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Inspiratory Capacity (IC)

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Functional Residual Capacity (FRC)

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Frequently Asked Questions

What is vital capacity?

Vital capacity (VC) is the maximum amount of air a person can exhale after taking the deepest breath possible. It represents the total usable lung capacity and is calculated as IRV + TV + ERV.

How do I calculate vital capacity?

Vital capacity is calculated using the formula: VC = IRV + TV + ERV, where IRV is inspiratory reserve volume, TV is tidal volume, and ERV is expiratory reserve volume.

What's the vital capacity equation?

The vital capacity equation is VC = IRV + TV + ERV. This represents the sum of inspiratory reserve volume, tidal volume, and expiratory reserve volume, measuring the maximum air exchange capacity.

What is the difference between tidal volume and vital capacity?

Tidal volume (TV) is the normal amount of air inhaled or exhaled during quiet breathing (about 500mL). Vital capacity is much larger, representing the maximum air capacity including reserve volumes.

How do you calculate total lung capacity?

Total lung capacity (TLC) is calculated as TLC = IRV + TV + ERV + RV. It includes all lung volumes: inspiratory reserve, tidal volume, expiratory reserve, and residual volume.

What is functional residual capacity?

Functional residual capacity (FRC) is the amount of air remaining in the lungs after normal expiration. It's calculated as FRC = ERV + RV and represents the lung's resting volume.

What are normal lung capacity values?

Normal total lung capacity ranges from 5,000-7,000mL for adults. Vital capacity typically ranges 3,000-5,000mL, while tidal volume is around 500mL. Values vary based on age, height, gender, and fitness level.

What is inspiratory capacity?

Inspiratory capacity (IC) is the maximum amount of air a person can inhale after normal expiration. It's calculated as IC = IRV + TV, combining tidal volume with inspiratory reserve volume.