BMI Calculator

Use the BMI calculator below to determine your body mass index by inputting your height and weight. The BMI calculator uses a formula that produces a score often used to tell whether a person is underweight, a normal weight, overweight, or obese.​

Use the BMI calculator below to determine your body mass index by inputting your height and weight. The BMI calculator uses a formula that produces a score often used to tell whether a person is underweight, a normal weight, overweight, or obese.



You are overweight

You may be a candidate for surgery.

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Bariatric Surgery Weight Loss Calculator​

Based on the bariatric procedure you undertake you can expect different levels of weight loss between twelve to eighteen months. The following calculator is meant to give you an idea of what to expect using your gender, height, starting weight and surgery type.

Choose the type of surgery, including gastric bypass, gastric sleeve, and gastric balloon, choose your gender and get your estimated weight loss. 

Use the options below to see what your estimated weight loss will be for the various types of surgeries available.

Starting Weight

155 lbs


After 12-18 Months

155 lbs

Estimated Weight Loss

With you're estimated to lose 67 lbs over 12-18 months

You are currently below your ideal body weight and thus not a candidate for surgery.

Ideal Body Weight (IBW) represents the weight a person should be for their height. Excess Body Weight (EBW) is the amount of weight a person is over their IBW.

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Find out if you are eligible for bariatric surgery. For faster answers please call 844-736-3963.

Which Bariatric Surgery Is Best:​

Obesity, measured by body fat and body mass index (BMI), puts you at risk of many diseases, such as type 2 diabetes and high blood pressure. It can reduce quality of life, increase healthcare spending, and raise the risk of premature death. You are prone to discrimination and stigmatization at work and in public places because of excess weight. Therefore, it is essential to evaluate weight loss options, including understanding your BMI, and to search for the most effective method of shedding excess weight and enhancing your health status. Bariatric surgery refers to the operative management of obesity that is aimed at achieving weight loss. It is the most effective option for individuals who have yet to achieve satisfactory weight loss with non-surgical methods. Many of them are available, but the common ones are Laparoscopic adjustable gastric banding, Gastric sleeve surgery, Roux-en-Y gastric bypass, and Biliopancreatic diversion with duodenal switch (BPD-DS). The question of “which bariatric surgery is the best” may not have a simple answer as all of them have their pros and cons but what is common to all is the proven effectiveness regarding weight loss and reversal of comorbid conditions.  The first step is to meet a doctor and determine if you are a candidate for bariatric surgery. The eligibility criteria for surgical management of obesity include:

  • Body Mass Index 30+
  • Physical problems that result from excess weight with adverse effects on day-to-day activities
  • Failure of other non-surgical treatment modalities with the risk of obesity-associated morbidity and mortality

After confirming that you are eligible for bariatric surgery, the next step is to determine the best bariatric medicine with your healthcare provider. Although general BMI calculators and eligibility criteria are used for all forms of weight loss surgeries, your unique BMI, body fat, and health conditions may favor the choice of one bariatric surgery over another. Your ultimate goal, whether it is reducing the risk of heart disease or achieving a specific weight loss target, can also impact the choice of the surgical procedure. Here are some questions to consider:

  • Are you seeking a reversible procedure?
  • Is your BMI significantly high?
  • What is your target for excess weight loss?
  • Do you have any pre-existing conditions that might make you a high-risk patient for a specific procedure?

The concept of the “best bariatric surgery” is contingent upon the unique needs and goals of each patient. It may involve prioritizing the bariatric surgery with the highest weight loss, the lowest rate of complications, or the most affordable bariatric surgery option. If you are looking for a procedure that will not alter the anatomy of your gastrointestinal tract or a process that is reversible, then laparoscopic adjustable gastric banding will be the best bariatric surgery for you.  For those with a BMI greater than 50 kg/m² and a desire to achieve the maximum weight loss possible, Biliopancreatic diversion with duodenal switch (BPD-DS) may be the most suitable bariatric surgery option. This procedure limits the stomach capacity and also reduces the absorption of nutrients from the intestine. Up to 78% of the excess weight can be lost within 12-18 months. The drawback of this procedure is that it is irreversible, has the highest rate of complications, and is also the most expensive bariatric surgery in most centers. Patients are often placed on nutritional supplements for life. Therefore, most surgeons prefer it as the last option when others have failed. For obese patients with heartburn due to gastroesophageal reflux disease (GERD) and a BMI greater than 30, gastric bypass surgery may be the best bariatric surgery if you are considering weight loss. Various studies, considering the patient’s BMI, have shown that Roux-en-Y gastric bypass improves symptoms in those with GERD. The weight loss is substantial, contributing significantly to weight loss goals, only second to what is obtained after BPD-DS. This result is more effective for people with a BMI of 35 or higher. For us, the ideal bariatric surgery requires a minimal alteration of the digestive tract anatomy, satisfactory weight loss, fewer complications, a low mortality rate, optimal improvement/reversal of comorbidities, and an affordable and low failure rate. Bariatric surgery, similar to a primary bariatric surgical procedure, such as gastric sleeve surgery, offers almost all these benefits. It involves the resection of the stomach to limit food intake, the intestine is left undisturbed, and the complication rate is low while the risk is low. The estimated weight loss, or the amount of weight the patient loses, is usually about 60% of excess weight, contributing to the percent total weight change provided. Although nutritional supplements may be required after the surgery, it is short-term. In conclusion, determining the most suitable bariatric surgery for you is a decision best made by your doctor or other healthcare provider. This decision can be reached after a comprehensive evaluation of your clinical status and a consideration of your desired goals.

BMI Formula In-Lbs

Ideally, BMI is calculated using kilograms and centimeters, but you can also calculate using pounds and inches using the following simple steps. Suppose an individual is 5 ft 3 inches tall and weighs 125 pounds; you can calculate the BMI as follows:

  1. Using the metric conversion factor, multiply their weight in pounds, i.e., 125 X 0.45= 56.25 kg.
  2. Using the metric conversion factor, multiply height in inches, i.e., 63 X 0.025= 1.575 m
  3. Next, you square the height. 1.575 X 1.575 = 2.480625 
  4. Divide the weight in kilograms by the square of your height. 56.25 / 2.480625 = 22.7

The answer: For an individual who is 5 ft 3 inches and weighs 125 lbs, their BMI is 22.7, rounded off to 23.

BMI Categories & What They Mean

Standard BMI categories for adults are as follows:

  1. BMI below 18.5 indicates that the individual is underweight.
  2. BMI between 18.5 and 24.9 means the individual has healthy or normal weight.
  3. BMI of between 25 and 29.9 means that the person is overweight.
  4. BMI of 30 and above signifies the individual is obese.

In children and teenagers, the BMI is dependent on sex and age.

Health Consequences of High BMI

BMI is essential in determining obesity and overweight. It is calculated using one’s weight and height. It is an estimate of the body fat one has and a good indication of their risk for particular diseases that are impacted by body fat. The higher one’s BMI is, the higher the risk of heart disease, type 2 diabetes, high blood pressure, particular cancers, gallstones, and breathing problems may increase or decrease.  Although BMI is a good indicator of body fat and overall health, it has some limitations. First, it overestimates body fat in people with a high muscular build, such as athletes. Secondly, it underestimates body fat in individuals who have lost muscle, such as older adults. BMI should, therefore, not be taken at face value. A doctor or other healthcare provider must consider other elements before deciding whether one is seen as overweight, underweight, or even obese. Some of the key health issues associated with a high BMI include:

  • High blood pressure hypertension
  • High LDL, Dyslipidemia, or low HDL cholesterol
  • Type 2 diabetes
  • Heart disease
  • Stroke
  • Osteoarthritis
  • Osteoporosis
  • Gallbladder disease
  • Breathing problems
  • Sleep apnea
  • Anxiety, clinical depression, and other mental disorders
  • Difficulty with physical functioning and body pain

Do I Qualify for Bariatric Surgery

BMI is one of the key determinants when it comes to bariatric surgery. People who are overweight or moderately obese and wish to lose weight without bariatric surgery do not qualify for this type of surgery. Because of its intensity, it is reserved for individuals who are morbidly obese. There are less invasive medical procedures that can be used for people who are overweight.

To qualify for bariatric surgery:

  1. You must have a BMI of 30 or greater.
  2. If you have been unable to achieve and maintain healthy weight loss for a long time, you could be considered for surgery.

Other rules regarding bariatric surgery determine if one can have it or not, and these may change from jurisdiction to jurisdiction. In the United States, for instance, it is recommended that only board-certified surgeons with specialized training and ample patient experience perform the surgeries and provide post-operative care. Patients who meet the criteria but have pre-existing conditions related or not related to obesity can also be disqualified for the procedure if the risk is low. This is because pre-existing illnesses could increase the risk of surgery or a complication for them. For instance, this operation cannot be conducted on a cancer patient. Patients who have undergone other weight loss procedures might also be disqualified from bariatric surgery depending on the type and nature of the previous weight loss process.

Get a Free Consultation

Find out if you are eligible for bariatric surgery. For faster answers please call 844-736-3963.