🫁 Lung Age Calculator

Find out how old your lungs are compared to your real age — based on the standard FEV1 lung-age model used in respiratory health screening.

Your Age

Sex

Height (cm)

Smoking Status

Pack Years (0 if never)

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📊 Your Results

📖 How It Works

Lung age is estimated by comparing your predicted FEV1 — the volume of air you can forcefully exhale in one second — to the value expected for someone of your sex and height. The age at which your FEV1 would be considered normal is your lung age.

The model uses the standard prediction equations (4.30 x height(m) - 0.029 x age - 2.49 for men, 3.95 x height(m) - 0.025 x age - 2.60 for women) and applies an average loss of about 0.021 litres per pack-year, with former smokers recovering part of the loss. This is an educational estimate, not a diagnosis — a real spirometry test by a doctor is the only accurate way to measure lung function.

📋 Example Lung Ages (175 cm / 5'9" Male, Age 40)

Smoking History	Estimated Lung Age
Never smoked	40
20 pack-years	54
40 pack-years	69

💡 Why It Matters

Understand Smoking's Impact

A smoker's lungs can age decades faster than their body — smoking accelerates the natural decline in lung function, and the effect is cumulative with every pack-year.

Motivation to Quit

Former smokers regain part of the lost function, so it is never too late — quitting slows further decline and can even improve your lung age over time.

Know When to See a Doctor

A lung age far above your real age is a reason to book a spirometry test — early detection of reduced lung function gives you the best chance of protecting your respiratory health.