How to Use the Lung Age Calculator
Lung age is a way of expressing how much smoking has strained your lungs, separate from your actual age. Enter your actual age, cigarettes per day, total years smoked, and years since quitting (if applicable), and this calculator computes your pack-years (equivalent to smoking one pack a day for that many years), then estimates a lung age and how far it sits from your actual age.
The more you smoked and the longer you smoked, the higher your pack-years, and each pack-year adds roughly 2.2 years to the estimated lung age in this model. If you've quit, the calculator also factors in a gradual recovery — the longer you've been smoke-free, the more of that added lung age is scaled back, since lung function decline slows and some damage improves over time after quitting.
This result is an educational approximation of the general relationship between smoking and lung function, not a substitute for an actual spirometry test. Clinics measure the real lung age by directly testing how much air you exhale in one second (FEV1). If you have symptoms like a persistent cough or shortness of breath, or want to know your true lung health, don't rely on this estimate alone — see a pulmonologist for testing and a proper evaluation.
Frequently Asked Questions
Yes. A spirometry test at a clinic measures how much air you exhale in one second (FEV1) and compares it to the average for your age group to calculate a real lung age. This calculator only estimates from smoking history, so get tested for an accurate number.
Not completely, but the rate of lung function decline slows down after quitting, and some damage gradually improves over time. This calculator factors in years since quitting and reduces the estimated lung age accordingly.