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Colorectal Cancer Risk

Colorectal 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.

Colorectal Cancer Risk

Ageyears
Family history (1 = none, 2 = one first-degree relative diagnosed at 60 or older, 3 = first-degree relative under 60 or two or more)
Age of the youngest affected relative at diagnosisyears
Age to start screening
45years
Average risk — USPSTF (2021): screen at 45–75, selectively at 76–85Family history — US Multi-Society Task Force (2017): colorectal cancer or advanced adenoma in a first-degree relativeLynch syndrome, familial adenomatous polyposis and inflammatory bowel disease require separate, earlier surveillance programsColorectal Cancer Risk: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.
Status at current age
Screening recommended
Years until screening starts
0years
Test and interval
Colonoscopy every 10 years or annual FIT
Source of the recommendation
USPSTF 2021

More about: Colorectal Cancer Risk

What it calculates

The “Colorectal Cancer Risk” calculator computes Age to start screening in years from 3 parameters: age (years), family history (1 = none, 2 = one first-degree relative diagnosed at 60 or older, 3 = first-degree relative under 60 or two or more), age of the youngest affected relative at diagnosis (years).

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

Example calculation

With parameters Age = 45 years, Family history (1 = none, 2 = one first-degree relative diagnosed at 60 or older, 3 = first-degree relative under 60 or two or more) = 1, Age of the youngest affected relative at diagnosis = 55 years the result is 45 years (Average risk — USPSTF (2021): screen at 45–75, selectively at 76–85).

How to use

  1. Enter age, family history (1 = none, 2 = one first-degree relative diagnosed at 60 or older, 3 = first-degree relative under 60 or two or more) and age of the youngest affected relative at diagnosis — each field above is adjustable with a slider.
  2. Age to start screening (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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