Mini Wright Peak Flow Meter Calculator

The Mini Wright Peak Flow Meter Calculator is an essential tool for assessing lung function, particularly useful for individuals with asthma or other respiratory conditions. It helps monitor lung health and manage symptoms effectively.

1. Enter your age, gender, and height in the respective fields.
2. Click the ‘Calculate’ button.
3. View your results and predicted peak flow rate below.
4. Use the chart to understand your lung function in relation to normal values.

The calculator uses the following formula to estimate peak expiratory flow (PEF):

PEF (L/min) = (Height (cm) – 100) * 0.025 + (Age – 20) * 0.35 + (if male, +4.3; if female, -4.3)

Normal Peak Expiratory Flow Rates by Age and Gender

Age (years)	Male (L/min)	Female (L/min)

Asthma Severity Based on Peak Expiratory Flow

Severity	PEF (% predicted)

• Regularly monitor your peak flow to track lung function and detect trends.
• Keep a peak flow diary to record and compare results over time.
• Consult your healthcare provider if your peak flow drops significantly or you experience symptoms like wheezing or shortness of breath.

What is peak expiratory flow (PEF)?

PEF is the maximum speed at which a person can exhale air from the lungs.

For more information, visit the National Heart, Lung, and Blood Institute and the Asthma and Allergy Foundation of America.