IRV Inspiratory Reserve Volume Calculator


Calculating the inspiratory reserve volume (IRV) is crucial in respiratory physiology to understand lung capacity and function. This article presents an calculator to compute IRV effortlessly.

How to Use

Simply input the required values into the designated fields, then click the “Calculate” button to obtain the result.


The formula to calculate the Inspiratory Reserve Volume (IRV) is:



  • IRV = Inspiratory Reserve Volume
  • TLC = Total Lung Capacity
  • RV = Residual Volume
  • VC = Vital Capacity

Example Solve

Let’s consider an example where:

  • Total Lung Capacity (TLC) = 6000 mL
  • Residual Volume (RV) = 1200 mL
  • Vital Capacity (VC) = 4800 mL

Using the formula:


The Inspiratory Reserve Volume (IRV) in this example is 0 mL.


Q: Can IRV be negative?
A: No, IRV cannot be negative. It indicates the additional volume of air that can be inhaled after a normal inhalation, so it’s always a positive value.

Q: What are the units for IRV?
A: The units for IRV are typically milliliters (mL) or liters (L), representing the volume of air.

Q: Why is IRV important?
A: IRV is important as it measures the maximum amount of air that can be inhaled after a normal inhalation. It helps in assessing respiratory function and lung capacity.


Understanding the Inspiratory Reserve Volume (IRV) is crucial in assessing lung function. With the provided HTML and JavaScript calculator, computing IRV becomes more accessible, aiding in respiratory physiology studies and clinical assessments.

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