Gallstone Risk Calculator
Estimate your risk of developing gallstones based on age, sex, BMI, diet, and other known risk factors.
Understand what you can and cannot change.
What Are Gallstones? Gallstones are hardened deposits of digestive fluid that form in the gallbladder. They range from as small as a grain of sand to as large as a golf ball. Most gallstones form when bile contains too much cholesterol or bilirubin, or when the gallbladder doesn’t empty properly.
About 10–15% of adults in Western countries have gallstones. Most gallstones cause no symptoms — but when they block the bile duct, they cause severe upper-right abdominal pain (biliary colic).
The “5 F” Rule (Classic Risk Factors) Clinicians traditionally remember gallstone risk using the “5 F’s”:
- Female — women are twice as likely as men to develop gallstones
- Fat (overweight/obese) — higher BMI significantly increases risk
- Forty (age 40+) — risk increases with age
- Fertile (pregnancy) — hormonal changes during pregnancy increase risk
- Fair (lighter skin) — some ethnic populations have higher rates, though this is a simplification
Additional Risk Factors
- Family history — a first-degree relative with gallstones doubles your risk
- Rapid weight loss or crash dieting — causes bile to become more concentrated
- Diabetes and insulin resistance — associated with higher cholesterol in bile
- Prolonged fasting or very low-calorie diets — reduces gallbladder contractions
- Cholesterol-lowering medications (fibrates) — paradoxically can increase cholesterol in bile
- Crohn’s disease and other GI conditions — affect bile salt absorption
Prevention Strategies
- Maintain a healthy weight and lose weight gradually if needed (no more than 1–2 lbs/week)
- Eat a high-fiber diet with fruits, vegetables, and whole grains
- Reduce refined carbohydrates, sugar, and saturated fats
- Stay physically active — exercise reduces gallstone risk by 20–40%
- Avoid prolonged fasting and very low-calorie diets
When to See a Doctor Sudden, intense pain in the upper right abdomen — especially after fatty meals — may indicate a gallstone attack. Jaundice (yellowing of skin or eyes), fever, and chills suggest infection and require emergency care.