Bmr To Lose Weight

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Here's How To Calculate Your Bmr For Fat Loss And Gains

This article was medically reviewed by Sarah C. McEwen, PhD, NSCA-CPT, the director of research and programming for Pacific Neuroscience Institute at Providence Saint John's Health Center and associate professor of translational neurosciences and neurotherapeutics at the John Wayne Cancer Institute in Santa Monica, California. 

Our stories are reviewed by medical professionals to ensure you get the most accurate and useful information about your health and wellness. For more information, visit our medical review board.

Knowing your BMR can help you more accurately determine the amount of calories you need to eat a day to lose weight. Oscar Wong/Getty Images

How To Use Bmr For Weight Loss

Your basal metabolic rate (BMR) refers to the amount of energy — or the number of calories — your body needs at rest to perform basic functions like breathing and pumping blood.

Note:BMR is often used interchangeably with RMR, or resting metabolic rate. Technically BMR is only measured in a dark room after eight hours of sleep and 12 hours of fasting.

BMR accounts for about 60% of the total calories you burn each day. But it does not include calories needed for physical activity like exercising, walking, or even just brushing your teeth.

Calories: How Weight Loss Works

Knowing how to calculate your BMR can help you better understand how many calories you need to eat each day to maintain or lose weight. Here's how to calculate BMR and tips to increase it.

BMR can vary based on several factors, and may even fluctuate throughout your life, says Dimitar Marinov, MD, an assistant professor at the Medical University of Varna, Bulgaria.

Understanding your BMR is an important starting point to making a weight loss plan because it enables you to determine your overall energy expenditure and how many calories you need to remain in a calorie deficit, says Alex Rothstein, the coordinator of the Exercise Science program at the New York Institute of Technology.

What Dieters Need To Know About Metabolism

Important: Consuming fewer calories than your BMR may actually cause you to hang on to extra weight, Rothstein says. It may slow your metabolism and put you at risk of starvation mode, which is when your body conserves energy and fat, making it difficult to lose weight.

If you are trying to lose weight, Rothstein recommends, eating at least as many calories as your estimated BMR and increasing calorie expenditure with increased exercise and daily activity.

How much weight you should aim to lose will vary depending on the individual, but experts recommend losing weight at 0.5% to 1% of your body weight every week. For a 180 pound person with a goal weight of 140 pounds, it would take 25 to 50 weeks to hit that point:

What Is Bmr Vs. Tdee And How To Use Them To Lose Weight

Your BMR is based on several factors that are out of your control, like your age and sex. But you can change your body composition by building more muscle, which may slightly increase your BMR.

Muscle burns more calories than fat, so the more muscle mass you have, the more energy your body needs to maintain it, Marinov says. Strength or resistance training can help build muscle by stimulating muscle growth.

Exactly how much muscle you would need to increase your BMR depends on several individual factors, but in general, one pound of muscle burns about 6 calories a day, which is about three times the calories burned by a pound of fat. So, putting on about 10 pounds of muscle could increase your BMR by about 60 calories.

Basal Metabolic Rate

A 2012 review found several weeks of resistance training may increase resting metabolic rate by as much as 7%. Meanwhile, in a small 2014 study, nine months of resistance training increased participants' BMR by about 5%.

While it is possible to slightly increase your BMR by building muscle, the best way to burn more calories in the day is through regular exercise, whether that be strength training, cardio, or a combination of the two, Marinov says.

BMR is the number of calories your body needs every day to perform basic functions. BMR can vary based on several different factors, including age, weight, sex, body composition, and genetics.

Knowing Your Bmr Is The Key To Building Muscle Or Losing Weight

You may be able to slightly increase your BMR by building muscle, but you should consult with your doctor before beginning any strength training regimen.

Erin Heger is a freelance journalist located in the Kansas City area. She primarily covers stories related to healthcare policy, maternal mental health, parenting, and personal finance. Her work been featured in TheAtlantic, Rewire.News, Refinery29, HuffPost, and more.How do you optimize a meal plan? Many factors go into meal planning, such as the type of nutrients consumed, the frequency of meals, and the selective use of fasting, to name a few. But a great place to start is to determine how many calories you burn a day. And it all begins with your Basal Metabolic Rate (BMR).

Basal Metabolic Rate is often used interchangeably with Resting Metabolic Rate or RMR, but it has one key difference. While resting metabolic rate calculates the number of calories your body burns at rest, the basal metabolic rate covers the number of calories burned to maintain normal function. 

Basal Metabolic Rate: What Is It And Why It's Important

The National Academy of Sports Medicine says that “technically, BMR measures energy expenditure in a darkened room (reclining position) after eight hours of sleep and following a 12-hour fast whereas RMR measurements are less restrictive and reflect the body’s resting energy expenditure after an overnight fast.”

Some research would suggest that BMR is a little more accurate than RMR, as the Resting metabolic rate has more uncontrollable factors. Both, however, still rely on an accurate lean body mass reading for their equations.

Certain medical devices also feature BMR as an output of body composition analysis, which will give you a much more accurate BMR measurement than these online calculators. However, there are a few things you should know about metabolism calculations.

How To Use A Tdee And Bmr Calculator To Lose Weight

Your caloric needs can be calculated with a few different equations, including the revised Harris-Benedict equation and Mifflin-St. Jeor equation. These equations calculate BMR using your weight, with some adjustments for height, age, and sex to give you your BMR estimate.  These formulas are often used in the calculators you will find online and in apps.

If you fall outside average assumptions for height, age, and sex (like an athlete), these formulas may not accurately produce your metabolic rate.

For people who fall outside the assumed ranges for height, age, and sex, there is another option: use the amount of lean body mass that you have to determine your metabolic rate. This is the J.J. Cunningham equation. 

Understanding Rmr, Bmr And More For Weight Loss

There are a number of factors that determine your basal metabolic rate, including genetics, age, sex, hormones, and body composition. That means while there are factors that are out of your control, if you focus on improving your body composition, you can increase your basal metabolic rate. Focus on increasing muscle mass to raise your basal metabolic rate.

Remember, your BMR is just the number of calories your body burns at rest and does not account for the calories you need to walk, talk, exercise, etc. When thinking about your caloric needs for a meal plan, you must account for your current activity level or your increased activity level if you plan to exercise more. To do that, convert your BMR to your Total Daily Energy Expenditure (TDEE). 

So, let’s take the example of a 171.1-pound male with 133.6 pounds of lean body mass and assume he is moderately active. Using the Cunningham equation, this person would have a BMR of around 1, 679 Cal/day. Multiply that by the conversion, and you get 2, 602.45, which is how many calories this person needs to maintain his weight.

Understanding Basal Metabolic Rate: How To Use It To Lose Weight

When trying to improve your body composition and body fat percentage, you must reduce fat mass and gain muscle. That’s why it takes a conscious effort to change your body composition.

Importantly, this also means that your diet must also match what your current goal is—body fat loss and/or gaining lean body mass. People who don’t calibrate their diet to match their goals end up sabotaging themselves by setting fitness and meal plans that are at odds with each other.

The most classic example is this: “I want to get buff, so I am going to diet (eat fewer calories) and work out more (increase energy expended).”

How To Lose Or Gain Weight Using Bmr & Tdee (calculator)

This isn’t a bad plan—if you’re only looking to lose fat. If you’re looking to build