Pack Year Calculator

Estimate smoking pack-years.

Pack-years 10

Formula: pack-years = packs/day × years

Step-by-step with your numbers:

1. Values used:

2. Packs per day = 1

3. Years smoked = 10

5. Pack-years = Packs per day x Years smoked = 1 x 10 = 10

Did we solve your problem today?

Pack-years summarize lifetime smoking exposure. Informational only.

The math behind it

pack-years = packs per day × years smoked (1 pack = 20 cigarettes).

1 pack/day for 10 years → 10 pack-years.

Half a pack?

Enter 0.5 packs/day — pack-years scale linearly.