Pulmonology · Primary Care · Oncology
Pack-Years Smoking Calculator calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
Allowed range: 0–100
Quick picks
years
Allowed range: 0–80 years
Quick picks
Result
2 fields remaining
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Clinical inputs
- Cigarettes per dayAccepted range: 0 to 100
- Years smokedAccepted range: 0 to 80
Primary source
Standard tobacco-exposure identity used in lung-cancer screening and COPD epidemiology: pack-years = (cigarettes per day ÷ 20) × years smoked. Widely codified in USPSTF/NLST eligibility thresholds (e.g., ≥20 pack-years). (2011)
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