Pack-Year
Calculate Pack-Year instantly with the exact formula and a worked example.
Pack-Year
Packs/day
Years of smoking
Pack-years
10
More about: Pack-Year
What it calculates
The “Pack-Year” calculator computes Pack-years from 2 parameters: packs/day, years of smoking.
Used by professionals and patients to assess health metrics, dosages, and risks.
Example calculation
With parameters Packs/day = 1, Years of smoking = 10 the result is 10.
How to use
- Enter packs/day and years of smoking — each field above is adjustable with a slider.
- Pack-years is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is BMI calculated?
BMI = weight (kg) / height (m)². Example: 70 kg / (1.75 m)² = 22.9. The WHO normal range is 18.5–24.9; below that is underweight, 25–29.9 is overweight, and 30+ is obese.
Is BMI accurate for everyone?
No. BMI does not distinguish muscle from fat, so athletes may show a high BMI with low body fat. It is also less reliable for teenagers, pregnant people, older adults, and very tall or short individuals.
What are the BMI categories?
Underweight: below 18.5. Normal: 18.5–24.9. Overweight: 25–29.9. Obese class I: 30–34.9; class II: 35–39.9; class III: 40+.
What is a better measure than BMI?
Body fat percentage, waist-to-height ratio (aim for under 0.5), and waist circumference give a clearer picture of health than BMI alone.
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