🚬 Pack-Years Calculator (Smoking)
Quantify cumulative cigarette exposure in pack-years for risk and screening.
Pack-Years Calculator (Smoking)
Cigarettes per day (/day)
Years smoked (years)
When to use
Lung cancer screening eligibility and tobacco risk assessment.
How it works
Pack-years = (cigarettes per day ÷ 20) × years smoked.
Key points
- USPSTF: age 50–80, ≥ 20 pack-years, current or quit < 15 yr → annual low-dose CT.
- 1 pack-year = 20 cigarettes/day for 1 year.
- Document quit date for screening windows.
References
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.