Weight Loss Calculators

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Meet Dr. Joshua Long:
Our Bariatric Surgeon

A nationally renowned and double-board-certified Denver bariatric surgeon, Dr. Long uses a partnership care model with each patient to tailor care to their individual needs. Patients routinely thank Dr. Long for his warm, compassionate bedside manner. He’s considered to be at the top of his field, having performed over 1,000 bariatric surgeries. Peers praise his technical skill, and he has some of the lowest complication rates among bariatric surgeons in the nation. Dr. Long and the staff at the Bariatric and Metabolic Center of Colorado consider it an honor to serve every patient with the highest quality of care.

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Dr. Joshua Long


Even after bariatric surgery, weight loss is a life-long journey. Weight loss calculators like the ones below are essential to help you craft and maintain a weight-loss strategy that will enable you to lose weight, keep it off, and live a healthy life*.

BMI Calculator

The Body Mass Index (BMI) calculator is a body fat calculator that helps you understand whether or not bariatric surgery is right for you. If your BMI is over 40 (or over 35 with co-morbidity issues), then bariatric surgery may be a good fit for you. If you score under a 35, then traditional weight loss methods like enhanced nutrition, an exercise regime, and bariatric medicine may help you more.

What does the BMI Calculator Measure?

The BMI Calculator measures your Body Mass Index, or the measure of your body fat based on your height and weight.

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BMR Calculator

The Basal Metabolic Rate (BMR) calculator measures the amount of energy that your body burns while in a resting state. This includes things like maintaining cell growth and body temperature, breathing, and blood circulation: all the things necessary for your body to stay alive.

Why is the BMR Calculator Important?

What BMR essentially measures is how many calories you will need to consume at a bare minimum in order to keep your body functioning effectively. This will inform your diet plan, because while it’s important to reduce calories to lose weight, you don’t want to consume fewer calories than your body needs to function.

How Many Calories Do I Need?

Heart Rate Calculator

The Heart Rate calculator is a crucial weight loss calculator to monitor your exercise patterns. After bariatric surgery, your exercise specialist will recommend that you engage in light exercise and gradually move up to moderate exercise. This may begin with simple stair-climbing or a walk around the neighborhood, and build up to activities like swimming, running, and playing basketball.

During any physical activity, you should be actively monitoring your heart rate. It is important to push yourself to the point of exertion, but without feeling faint or like your heart is pounding in your throat. The key is consistent, healthy exercise.

What Should My Heart Rate Be?

The heart rate calculator can help you calculate what your ideal heart rate should be while you’re exercising. It will give you a range, and the range will vary based on how intense you want your workout to be. Ideally, you’ll want a heart rate of 220 (-) your age, (x) between 65% and 85%; 65% for lower-exertion workouts, 85% for higher-activity exercise.

Calculate My Heart Rate

These weight loss calculators are powerful tools to help you lose weight and improve your quality of life*.

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This page was medically reviewed by Dr. Joshua Long, MD, MBA, FACS, FASMBS. Dr. Long is a double-board-certified bariatric surgeon and bariatric medical director for Parker Adventist Hospital.
Full Bio: Dr. Joshua Long, MD, MBA, FACS, FASMBS
Page Updated: February 6th, 2021

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*Please note that individual results can vary and are not guaranteed.