Cigarettes per day yrs
Cigarettes per day yrs
Cigarettes per day yrs
Cigars or spliffs per day yrs
Cigarillos per day yrs
Pipe (no. of bowls) per day yrs
Tobacco (ozs) per week yrs
Tobacco (grams) per week yrs
Water pipe (20 min session) per week yrs
Pack years:

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This calculator helps to produce a numerical value of lifetime tobacco exposure called pack years. A pack year is defined as twenty cigarettes smoked everyday for one year. People who smoke often vary their smoking habits over the years which can make it difficult to create a pack score. This smoking pack year calculator simplifies the task.

Read more in the FAQs and see Instructions.

The smoking pack year calculator was highly commended in the Best use of Media and Technology in the GP Enterprise awards 2012. The Judges said “The simplicity and usefulness of this calculator, and the generosity of its creators, mean that we should take every opportunity to disseminate its availability”.


Using the Calculator To use the smoking pack years calculator enter a value for each of the types of tobacco smoked and the period of years over which the quantity you have entered was smoked.

Once you have entered all the values click the Calculate button to calculate the total smoking load and the pack years value.

Once the calculation has been made you can either amend the numbers you have entered or click the Reset button to reset the calculator.

Please note that whilst most of the values should be specified as number smoked per day, tobacco should be specified as amount smoked per week.