Smoking Pack-Year Calculator
Measure lifetime cigarette exposure in pack-years.
Your result will appear here
Enter your measurements, then press Calculate.
Methodology
Pack-years
pack-years = (cigarettes per day ÷ 20) × years smoked
One pack-year equals smoking 20 cigarettes a day for one year.
- Who it is for
- Current or former cigarette smokers.
- Version
- 1.0.0
Worked example: how to calculate pack-years
Inputs
- Cigarettes smoked per day (on average)
- 20 cigarettes/day
- Years smoked
- 15 years
Result
- Pack-years
- 15
Under 20 pack-years
An illustration with sample values, worked out with the same method the tool above uses.
Limitations
- Does not capture shisha (water-pipe) or e-cigarette exposure.
References
- US Preventive Services Task Force; Krist AH, Davidson KW, Mangione CM, et al. Screening for lung cancer: US Preventive Services Task Force recommendation statement. JAMA. 2021;325(10):962–970. doi:10.1001/jama.2021.1117