BMI Calculator for Bariatric Surgery Candidates

BMI is a mathematical formula:

weight (lbs) ÷ height² (inches) × 703‍

It provides a quick way to classify your weight status:

• Underweight: BMI < 18.5
• Normal weight: BMI 18.5–24.9
• Overweight: BMI 25–29.9
• Obesity Class I: BMI 30–34.9
• Obesity Class II: BMI 35–39.9
• Obesity Class III: BMI ≥ 40

A BMI of 35 or higher may indicate that you qualify for bariatric surgery, especially if you also have health conditions related to obesity.

According to the CDC, over one-third of U.S. adults are obese — and obesity increases the risk for many chronic health conditions, including:

• Type 2 Diabetes
• Heart Disease
• High Blood Pressure
• Sleep Apnea
• Osteoarthritis
• GERD (acid reflux)
• Fatty Liver Disease
• Depression

While BMI is a helpful screening tool, it isn’t perfect. It doesn’t distinguish between fat and muscle. That means:

• Athletes may have a high BMI due to muscle, not fat.
• Older adults may have a normal BMI but still carry excess fat.

That’s why we also recommend tracking waist circumference for a more complete picture.

1. Place a tape measure above your hip bones.
2. Make sure it’s level and snug — but not tight.
3. Measure after exhaling naturally.

High abdominal fat increases the risk for heart disease and diabetes, even in people with a normal BMI.

You may qualify for bariatric surgery if you:

• Have a BMI of 40 or higher, or
• Have a BMI of 35+ with obesity-related health issues
• Are 100 pounds or more over your ideal body weight
• Have been unable to lose weight through diet and exercise
• Are between the ages of 14 and 75

If weight gain is due to a temporary condition (like pregnancy), you may not be eligible.

Why Choose Surgery Over Diets or Injections?

Bariatric surgery is a proven long-term solution. Our experienced team offers:

• Gastric Sleeve
• Gastric Bypass
• Duodenal Switch
• Adjustable Gastric Band

These procedures can eliminate or improve diabetes, high blood pressure, sleep apnea, and more — all while helping you regain confidence and mobility.

We do not recommend or prescribe weight-loss injections like semaglutide due to safety concerns.

Start Your Journey Today

Request a Consultation with one of our expert bariatric surgeons in Walnut Creek or Brentwood.