# Vital Capacity Calculator

The vital capacity calculator calculates the vital capacity of a person.

The vital capacity is the maximum amount of air that a person can expel from his or her lungs after a maximum inhalation.

A person's vital capacity can be meausred by a spirometer. The vital capacity can help make a diagnosis of underlying lung health condtions. The vital capacity can be used to help differentiate causes of lung disease. In restrictive lung disease such as acute respiratory distress syndrome (ARDS), the vital capacity is decreased. In obstructive lung disease such as asthma or bronchiolitis, the vital capacity is normal or slightly decreased. The vital capacity can be used to determine the severity of respiratory muscle involvement for any condition such as in neuromuscular disease and can guide treatment decisions in Guillain–Barré syndrome and myasthenia gravis.

The normal range for vital capacity is between 3 and 5 liters.

A person's vital capacity depends on a number of factors, including age, gender, and height.

The formula used to estimate the vital capacity in a male is, vital capacity (male)= (21.78 - 0.101a) * h, where a is the age and h is the height of the person.

The formula used to estimate the vital capacity in a female is, vital capacity (female)= (27.63 - 0.112a) * h, where a is the age and h is the height of the person.

The output of the vital capacity is then shown in unit millimeters (mL) and unit liters (L).

To use this calculator, a user simply enters in the gender, age, and height of the person, and clicks the "Calculate" button. The resultant vital capacity (in unit mL and L) will then be automatically computed and shown.

The height of the person can be entered in many different units, including feet (such as 6'1"), inches (such as 72 inches), meters (such as 1.78 meters), or centimeters (1,780 centimeters).

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