Pack Year Calculator
Calculate your smoking pack-years from packs per day and years smoked, and check lung cancer screening eligibility under USPSTF 2021 criteria. Example: 1.5 packs a day for 20 years equals 30 pack-years.
Show steps
How to use the Pack Year Calculator
- Enter the values in the fields.
- Press Calculate to see the result with the steps shown.
Formula and method
Pack-years = (cigarettes smoked per day / 20) x number of years smoked.
Pack-year examples
| Cigarettes per day | Years | Pack-years |
|---|---|---|
| 10 | 10 | 5.0 |
| 20 | 10 | 10.0 |
| 20 | 20 | 20.0 |
| 30 | 20 | 30.0 |
| 40 | 30 | 60.0 |
Lung cancer screening eligibility (USPSTF 2021)
Adults aged 50 to 80 with a 20 or more pack-year history who currently smoke or have quit within the past 15 years should have yearly low-dose CT. Screening stops when health problems make surgery unlikely or after 15 years since quitting.
What pack-years tell you
The number is a rough measure of lifetime exposure. Risk of lung cancer, COPD and heart disease rises with pack-years, and falls over time after quitting.
Ways to quit
Counseling combined with medicine, such as nicotine replacement, varenicline or bupropion, roughly doubles quit rates. This calculator is for education and is not medical advice. Decisions about testing and treatment belong with a qualified clinician.
Frequently asked questions
What is a pack-year?
Smoking one pack (20 cigarettes) a day for a year.
How do I calculate pack-years?
Packs per day times years smoked.
Does 20 pack-years qualify for screening?
Yes, with age 50 to 80 and current or recent smoking.
Do cigars count?
Pack-years refer to cigarettes; discuss other tobacco use with your clinician.
Does quitting reduce risk?
Yes, steadily.
Where can I get help quitting?
1-800-QUIT-NOW in the US.
Sources
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