GlenCalc

Pack-year calculator

One pack-year is smoking 20 cigarettes a day for a year.

Your answer

Pack-years22
USPSTF lung screening criteria (age 50–80, 20+ pack-years)Meets the age and pack-year criteria; talk to your doctor
  • General information, not medical advice.

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How we worked it out

Updated as you change the numbers.

  1. Pack-years = packs per day × years smoked (20 cigarettes = 1 pack).

Method and assumptions

The US Preventive Services Task Force (2021) recommends yearly low-dose CT screening for adults 50 to 80 with a 20 pack-year history who smoke now or quit within the past 15 years.

Questions

How many pack-years is a pack a day for 22 years?

22 pack-years.

Sources

Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.

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