Pack-Years Calculator
Estimate cumulative smoking exposure in pack-years — the standard measure used to assess smoking-related disease risk.
How to Use the Pack-Years Calculator
- Enter average cigarettes smoked per day.
- Enter total years smoked.
- Click Calculate to see pack-years and risk tier.
Cas d'utilisation
- •Assessing eligibility for lung cancer screening.
- •Documenting smoking history in clinical records.
- •Motivating smoking cessation.
Formule
Pack-years = (cigarettes per day × years smoked) / 20. One pack = 20 cigarettes.
Questions fréquemment posées
What is a pack-year?
One pack-year equals smoking one pack (20 cigarettes) per day for one year. It is the standard metric used in lung cancer, COPD and cardiovascular risk assessment.
When is lung cancer screening recommended?
US Preventive Services Task Force recommends low-dose CT screening annually for adults aged 50–80 with a ≥ 20 pack-year smoking history who currently smoke or quit within the past 15 years.
Disclaimer
Educational use only. Discuss personal risk with your physician.