# Peak Flow Meter Calculator | PEF Calculator

Measuring Peak Expiratory Flow (PEF) is a test to measure the person's ability to breathe out air. The peak expiratory flow (PEF) is a person's maximum speed of expiration. Here is an online peak flow meter calculator for measuring your peak flow rate (PEFR). Enter the age, height in this PEF calculator to know the Normal (Predicted) Peak Flow of a human's expiration. You can use this PEFR peak expiratory flow calculator for both male and female.

## PEFR Peak Expiratory Flow Calculator

Measuring Peak Expiratory Flow (PEF) is a test to measure the person's ability to breathe out air. The peak expiratory flow (PEF) is a person's maximum speed of expiration. Here is an online peak flow meter calculator for measuring your peak flow rate (PEFR). Enter the age, height in this PEF calculator to know the Normal (Predicted) Peak Flow of a human's expiration. You can use this PEFR peak expiratory flow calculator for both male and female.

Code to add this calci to your website

#### Formula:

PEF (Female) = e^{((0.376 x ln(Age)) - (0.012 x Age) - (58.8 / Height) + 5.63)}
PEF (Male) = e^{((0.544 x ln(Age)) - (0.0151 x Age) - (74.7 / Height) + 5.48)}
### Example:

Calculate the peak expiratory flow of a 25 years old women whose height is 160 cm.

#### Solution:

PEF (Female) = e^{((0.376 x ln(25)) - (0.012 x 25) - (58.8 / 160) + 5.63)}

= 479.5256 L/min

**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.