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Lung Cancer Risk

Lung Cancer Risk: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.

ℹ Reference calculation based on the published method. It does not replace a clinical examination or a doctor's decision.

Lung Cancer Risk

Ageyears
Cigarettes per day (average over smoking years)pcs
Years of smokingyears
Years since quitting (0 = currently smokes)years
Smoking history in pack-years
30pack-years
USPSTF (2021): annual low-dose chest CT for adults aged 50–80 with at least 20 pack-years who currently smoke or quit within the past 15 yearsPack-year = (cigarettes per day / 20) × years of smokingIndividual lung cancer probability is estimated with multivariable models (e.g. PLCOm2012); this calculation does not replace themLung Cancer Risk: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.
USPSTF 2021 screening
Recommended: annual low-dose CT
Age 50–80 years
Criterion met
At least 20 pack-years
Criterion met
Smokes now or quit less than 15 years ago
Criterion met

More about: Lung Cancer Risk

What it calculates

The “Lung Cancer Risk” calculator computes Smoking history in pack-years in pack-years from 4 parameters: age (years), cigarettes per day (average over smoking years) (pcs), years of smoking (years), years since quitting (0 = currently smokes) (years).

Used by professionals and patients to assess health metrics, dosages, and risks.

Example calculation

With parameters Age = 60 years, Cigarettes per day (average over smoking years) = 20 pcs, Years of smoking = 30 years, Years since quitting (0 = currently smokes) = 0 years the result is 30 pack-years (USPSTF (2021): annual low-dose chest CT for adults aged 50–80 with at least 20 pack-years who currently smoke or quit within the past 15 years).

How to use

  1. Enter age, cigarettes per day (average over smoking years), years of smoking and years since quitting (0 = currently smokes) — each field above is adjustable with a slider.
  2. Smoking history in pack-years (pack-years) is calculated automatically as you type.
  3. Check the worked example below to see the formula applied to real numbers.
  4. 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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