# FEV1 Calculator

Fev1 refers to Forced Expiratory Volume. It's used as a common indexes in the diagnosis of airway obstructive and restrictive lung disease. It is the measure of maximum amount of air that an person can exhale forcefully in a second. FEV1 is the standard unit of measurement used by doctors to analyze the respiratory health. It is measured using spirometer. Normal Fev1 should be above 80 percent. Find the Fev1, FVC value and Fev1 FVC ratio with this online calculator.

Code to add this calci to your website

#### Formula:

FEV1 = Race x ((0.0395 x Height) - (0.025 x Age) - 2.6)
FVC = Race x ((0.0443 x Height) - (0.026 x Age) - 2.89)
FEV_{1} FVC Ratio = 89.1 - (0.19 x Age)
### Example:

A 35 years old Asian Woman is 160 cm tall, calculate FEV1 FVC Ratio?

#### Solution:

FEV1 = Race x ((0.0395 x Height) - (0.025 x Age) - 2.6)

= 0.93 x ((0.0395 x 160) - (0.025 x 35) - 2.6)

= 2.6459 litres

FVC = Race x ((0.0443 x Height) - (0.026 x Age) - 2.89)

= 0.93 x ((0.0443 x 160) - (0.026 x 35) - 2.89)

= 3.0578 litres

FEV_{1} FVC Ratio = 89.1 - (0.19 x Age)

= 89.1 - (0.19 x 35)

= 82.45 %

**Note :**This statistics calculator is presented for your own personal use and is to be used as a guide only. Medical and other decisions should NOT be based on the results of this calculator. Although this calculator has been tested, we cannot guarantee the accuracy of its calculations or results.