Pack Years Calculator

Calculates pack years in patients with any smoking history.

Instructions

ADVICE

According to clinical practice guidelines, adult patients ages 50-80 years with ≥20 pack year history of smoking and who currently smoke or have quit within the last 15 years are generally considered high risk for lung cancer and should undergo annual screening with low-dose CT (USPSTF, AAFP, NCCN, and others).

Packs of cigarettes smoked per day *

1 pack = 20 cigarettes (e.g. enter 2 for 40 cigarettes/day)

packs

Age started smoking *

years

Age stopped smoking or current age if still smoking *

years

Nonsmoking years *

Example: A patient who smoked for 20 years but reports a 2-year cessation period before returning to smoking should be entered as '2'.

years

Result

Pack Years Calculator

Step-by-step mode. Answer each question and result updates automatically.

Questions

1 Packs of cigarettes smoked per day

2 Age started smoking

3 Age stopped smoking or current age if still smoking

4 Nonsmoking years

Step 1 of 4 25%

Packs of cigarettes smoked per day *

Step 1 of 4

packs

Age started smoking *

Step 2 of 4

years

Age stopped smoking or current age if still smoking *

Step 3 of 4

years

Nonsmoking years *

Step 4 of 4

years

US Preventive Services Task Force. Screening for Lung Cancer: US Preventive Services Task Force Recommendation Statement. JAMA. 2021;325(10):962-970.
National Comprehensive Cancer Network. NCCN Clinical Practice Guidelines in Oncology: Lung Cancer Screening.

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Pack Years Calculator

All questions complete

Pack Years Calculator

Packs of cigarettes smoked per day *

Age started smoking *

Age stopped smoking or current age if still smoking *

Nonsmoking years *

All questions complete

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