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# Peak Flow Calculator

Peak Expiratory Flow Rate (PEFR) is a human's maximum speed of expiration. Peak flow meter is a device used to monitor the ability of a person to breathe out air. Peak flow readings will be higher when patients are normal and lower when the airways are constricted. Here is the peak flow calculator used to calculate normal flow rate values using the person's height, age and measured peak flow. Enter your age, height, gender, measured peak flow in the PEFR Calculator to know the PEFR rate.

## Peak Expiratory Flow Rate | PEFR Calculator

Male Female
cm
feet
L/min
%

Peak Expiratory Flow Rate (PEFR) is a human's maximum speed of expiration. Peak flow meter is a device used to monitor the ability of a person to breathe out air. Peak flow readings will be higher when patients are normal and lower when the airways are constricted. Here is the peak flow calculator used to calculate normal flow rate values using the person's height, age and measured peak flow. Enter your age, height, gender, measured peak flow in the PEFR Calculator to know the PEFR rate.

#### 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:

A 25 years woman 154 cm tall with a measured peak flow of 32 L / min would have a Peak Expiratory Flow Rate.

#### Solution:

PEF (Female) = e((0.376 x ln(Age)) - (0.012 x Age) - (58.8 / Height) + 5.63)
= e((0.376 x ln(25)) - (0.012 x 25) - (58.8 / 154) + 5.63)
= 472.7086 L/min

## Related Calculators:

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.