Lung Cancer Risk Calculator

Assess your risk for lung cancer based on smoking history, environmental exposures, family history, and other factors.

Demographic Information

years
Lung cancer risk increases with age, especially after 55
1 55 years 100
Men have slightly higher lung cancer risk than women
African Americans have higher lung cancer incidence and mortality
cm
Taller height may be associated with slightly increased risk

Smoking History *

Smoking is the most important risk factor for lung cancer, responsible for about 85% of cases

Risk decreases after quitting but remains elevated for years
years
Enter 0 if never smoked
Pack-Year Calculator

Pack-years = (packs per day) × (years smoked). 20 pack-years is a common threshold for screening.

packs/day
years
pack-years

Family History and Genetics

Having a first-degree relative with lung cancer increases your risk
Certain genetic mutations increase lung cancer risk
Environmental & Occupational Exposures (Optional) Click to expand

Various environmental and occupational exposures can increase lung cancer risk

Radon is the second leading cause of lung cancer
Asbestos exposure increases lung cancer risk, especially in smokers
Long-term exposure to air pollution increases risk
Includes secondhand smoke, occupational chemicals, radiation

Medical History and Lifestyle

COPD increases lung cancer risk 4-6 times
Diets rich in fruits and vegetables may reduce risk
Regular exercise may reduce lung cancer risk
Heavy alcohol use may increase risk
Fields marked with * are required for accurate risk assessment.
Calculating your risk assessment...

Understanding Lung Cancer Risk

Lung cancer is the leading cause of cancer deaths worldwide. Early detection is challenging because symptoms often don't appear until the disease is advanced. Understanding your risk factors can help you take preventive measures and determine if you're eligible for screening.

Key Risk Factors: Smoking is responsible for about 85% of lung cancer cases. Other important factors include radon exposure, occupational exposures, family history, and pre-existing lung diseases.

Types of Lung Cancer

Type Percentage Description Common Subtypes Treatment Approach
Non-Small Cell Lung Cancer (NSCLC) 80-85% Most common type, tends to grow and spread more slowly Adenocarcinoma, Squamous cell carcinoma, Large cell carcinoma Surgery, radiation, chemotherapy, targeted therapy, immunotherapy
Small Cell Lung Cancer (SCLC) 10-15% More aggressive, often spreads quickly Small cell carcinoma, Combined small cell carcinoma Chemotherapy, radiation, rarely surgery
Other Types 5% Less common types of lung cancer Carcinoid tumors, adenoid cystic carcinomas, sarcomas Varies by specific type

Common Symptoms of Lung Cancer

Early lung cancer often has no symptoms. When symptoms do appear, they may include:

  • Persistent cough that doesn't go away or worsens
  • Coughing up blood or rust-colored sputum
  • Chest pain that worsens with deep breathing, coughing, or laughing
  • Hoarseness
  • Shortness of breath
  • Unexplained weight loss and loss of appetite
  • Fatigue and weakness
  • Recurrent infections like bronchitis and pneumonia
  • Wheezing
  • Bone pain or headaches (if cancer has spread)

Lung Cancer Screening Guidelines

Organization Recommendation Eligibility Criteria Screening Method
U.S. Preventive Services Task Force (USPSTF) Annual screening Age 50-80, 20 pack-year smoking history, current smoker or quit within past 15 years Low-dose CT scan
American Cancer Society (ACS) Annual screening Age 50-80, 20 pack-year smoking history, current smoker or quit within past 15 years, in fairly good health Low-dose CT scan
National Comprehensive Cancer Network (NCCN) Annual screening Age 50-80, 20 pack-year smoking history, additional risk factors considered Low-dose CT scan

Lung Cancer Prevention Strategies

Don't Smoke / Quit Smoking
If you don't smoke, don't start. If you do smoke, quitting is the most important thing you can do to reduce your lung cancer risk.
Test Your Home for Radon
Radon is the second leading cause of lung cancer. Test your home and mitigate if levels are high.
Protect Against Workplace Carcinogens
Follow safety protocols if exposed to asbestos, diesel exhaust, silica, or other lung carcinogens at work.
Eat a Healthy Diet
Diets rich in fruits and vegetables may help protect against lung cancer. Avoid high-dose beta-carotene supplements if you smoke.
Exercise Regularly
Regular physical activity may help reduce lung cancer risk and improve overall health.
Limit Alcohol
Heavy alcohol consumption may increase lung cancer risk. Drink in moderation if you choose to drink.

Understanding Pack-Years

1

What are pack-years? Pack-years are calculated by multiplying the number of packs of cigarettes smoked per day by the number of years the person has smoked. For example: 1 pack/day × 20 years = 20 pack-years.

2

Why are pack-years important? Most lung cancer screening guidelines use a threshold of 20 pack-years to determine eligibility for low-dose CT screening. Higher pack-years mean higher lung cancer risk.

3

How to calculate: If you smoked 1.5 packs per day for 15 years: 1.5 × 15 = 22.5 pack-years. Use the calculator above to determine your pack-year history.

Important Note: This calculator provides an estimate of your lung cancer risk based on known risk factors. It is not a diagnostic tool. If you have concerns about your lung health or notice symptoms, consult a healthcare professional, preferably a pulmonologist or oncologist.

Frequently Asked Questions

Quitting smoking at any age can lower your risk of lung cancer. After 10 years of quitting, your risk of dying from lung cancer is about half that of a person who is still smoking. After 15 years, your risk of lung cancer is similar to that of a non-smoker. The earlier you quit, the greater the benefit, but quitting at any age is beneficial.

The U.S. Preventive Services Task Force recommends annual lung cancer screening with low-dose CT scan for adults aged 50-80 who have a 20 pack-year smoking history and currently smoke or have quit within the past 15 years. Screening should be discontinued once a person has not smoked for 15 years or develops a health problem that substantially limits life expectancy or the ability to have curative lung surgery.

Yes, non-smokers can get lung cancer. About 10-20% of lung cancers occur in people who have never smoked or smoked fewer than 100 cigarettes in their lifetime. Risk factors for non-smokers include radon exposure, secondhand smoke, air pollution, occupational exposures, and genetic factors. Lung cancer in non-smokers often has different genetic mutations and may respond better to certain targeted therapies.

Survival rates vary greatly by stage at diagnosis. The 5-year survival rate for localized lung cancer (confined to the lungs) is about 63%. For regional spread (to nearby lymph nodes), it's about 35%. For distant metastasis (spread to other organs), it's about 7%. Overall, the 5-year survival rate for all stages combined is about 25%. Early detection through screening significantly improves survival rates.

A low-dose computed tomography (LDCT) scan is a special type of X-ray that takes multiple pictures of your lungs. It uses much less radiation than a standard CT scan. The scan is quick and painless, taking only a few minutes. LDCT can detect lung abnormalities, including early-stage lung cancers, when they are small and more treatable. The National Lung Screening Trial found that LDCT screening reduced lung cancer deaths by 20% in high-risk individuals.