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What are smoking pack-years?

Pack-years measure cumulative tobacco exposure over a lifetime. One pack-year equals smoking one pack (20 cigarettes) a day for one year, so the metric combines how much and how long you have smoked into a single number.

How do I calculate pack-years?

Multiply the number of cigarette packs smoked per day by the number of years you smoked. For example, 10 cigarettes a day (half a pack) for 20 years equals 10 pack-years. Enter your daily count and years and the calculator does the math.

Why do pack-years matter?

Pack-years are widely used to estimate smoking-related health risk, especially for lung cancer screening eligibility. A higher pack-year total reflects greater cumulative exposure, and many screening guidelines use a threshold such as 20 pack-years.