BMR, or Basal Metabolic Rate, represents the number of calories your body needs to perform basic functions while at rest. These functions include 

  • breathing, 
  • circulating blood
  • maintaining body temperature
  • metabolism
  • cell function, growth, and repair 

As you age, your BMR will fall and so will your TDEE. You can calculate your TDEE using our TDEE Calculator here.

In essence, it's the energy your body requires to stay alive. Knowing your BMR is a foundational step in managing your weight because it helps you understand your body's calorie needs at a resting state.

Note that BMR is different from RMR, which you can find out more about and calculate using our RMR Calculator


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One of the most important things to do when embarking on a training plan or new diet is to calculate your caloric requirements. The main number you will need to find is your basal metabolic rate (BMR).



It’s easy enough to find a rough estimate of your BMR. Though actual amounts will vary according to person - there are too many variables to take into account to be 100% accurate all the time - a simple BMR calculator will be able to put you in the right ballpark.


Alternatively, you can do it yourself using a simple enough equation. This is called the Harris-Benedict equation, and it goes like this:


For women: BMR = 655 + (9.6 × weight in kg) + (1.8 × height in cm) – (4.7 × age in years)


For men: BMR = 66 + (13.7 × weight in kg) + (5 × height in cm) – (6.8 × age in years)


BMR      BMR


Whether your goal is to shed excess weight or gain muscle, understanding your BMR is vital. Here's how it can be applied to both scenarios:


BMR Calculator to Lose Weight:


To lose weight, you need to create a calorie deficit, meaning you consume fewer calories than your body needs. Knowing your BMR allows you to estimate your daily calorie needs accurately.

You can then adjust your calorie intake and monitor your progress, ensuring you're on the right track to achieving your weight loss goals.


BMR Calculator to Gain Weight:


Conversely, if you're looking to gain weight, you'll want to consume more calories than your BMR. This surplus provides your body with the necessary energy to build muscle and increase your overall mass. 

By using your BMR as a starting point, you can determine the appropriate calorie intake to support your muscle-building journey.

In short, you can use your BMR to aid in weight loss, gain, or maintenance.



Your Basal Metabolic Rate (BMR) is the cornerstone of your Total Daily Energy Expenditure (TDEE). Here's what BMR reveals:

BMR represents the number of calories your body needs at rest to maintain basic functions.

TDEE accounts for your BMR plus additional calories burned through daily activities and exercise.

BMR provides a baseline for understanding your body's calorie needs, while TDEE factors in the calories you burn through physical activity and lifestyle choices.

By knowing your BMR and activity level, you can estimate how many calories you should consume daily to maintain, lose, or gain weight.



Understanding how to use a BMR calculator is key to harnessing its potential for your fitness journey. Here's a step-by-step guide on how to use it effectively:


Step 1: Gather Your Information


Before you begin, you'll need a few pieces of essential information:


Your age: 

This helps calculate your BMR as metabolic rates can change with age.

Your gender: 

Men and women often have different BMRs due to variations in muscle mass and body composition.

Your weight: 

Your weight in kilograms or pounds is a crucial factor in BMR calculations.

Your height: 

Height, usually in centimeters or inches, is another vital input.

Activity level: 

Have an idea of your daily activity level. Common categories include sedentary, lightly active, moderately active, and very active.


Step 2: Choose a BMR Calculation Formula


There are different formulas available to calculate BMR, with the Harris-Benedict Equation being one of the most popular. As mentioned earlier, the formula varies depending on your gender. Plug your age, gender, weight, and height into the appropriate formula to calculate your BMR.


Step 3: Calculate Your BMR


Perform the calculations based on the formula you've chosen. This will give you your Basal Metabolic Rate, which represents the number of calories your body needs at rest.


Step 4: Determine Your Total Daily Energy Expenditure (TDEE)


Your TDEE is the next crucial step. It takes into account your BMR and your daily activity level to estimate the total number of calories you need each day. To calculate TDEE, multiply your BMR by the appropriate activity factor:


Sedentary (little or no exercise): BMR x 1.2

Lightly active (light exercise or sports 1-3 days a week): BMR x 1.375

Moderately active (moderate exercise or sports 3-5 days a week): BMR x 1.55

Very active (hard exercise or sports 6-7 days a week): BMR x 1.725


Step 5: Set Your Fitness Goals


Now that you know your TDEE, you can customize your calorie intake based on your fitness goals:


To lose weight, create a calorie deficit by consuming fewer calories than your TDEE.

To gain weight or build muscle, consume a surplus of calories, ideally in the form of nutrient-dense foods.


Step 6: Monitor and Adjust


Regularly monitor your progress and make adjustments as needed. 

The BMR calculator provides a foundation, but everyone's body is unique, so it may take some trial and error to find the perfect calorie balance for your goals.



Once you’ve got your BMR, you need to multiply it by your activity level. This will make sure that you allow for the extra calories needed for things like walking around, playing sports, training and rebuilding muscle through hypertrophy.


To include the number of calories you burn during daily activities based on your lifestyle, use the following multiplications:


Sedentary: If you get little or no exercise, multiply your BMR by 1.2.


Lightly active. If you lightly exercise one to three days per week, multiply your BMR by 1.375.


Moderately active. If you moderately exercise three to five days per week, multiply your BMR by 1.55.


Very active. If you take part in hard exercise six to seven days per week, multiply your BMR by 1.725.


Extra active. If you engage in very hard exercise six to seven days per week or have a physical job, multiply your BMR by 1.9.


he number you get is the number of daily calories you need in order to maintain your current weight. Obviously, these are rough guides, so you may need to play around with the numbers to better suit your needs as you go along.


If your goal is to maintain your current weight, eat this amount. Add 500 calories to the total to gain around 1lb per week or deduct 500 calories to lose roughly 1lb per week.



Now that you've mastered the BMR calculator and have a firm grasp on your daily calorie needs, it's time to fine-tune your fitness plan. 


Here are some additional tips to help you make the most of this newfound knowledge:


  • Set Realistic Goals: 

Whether you're aiming to lose weight or gain muscle, setting realistic and achievable goals is essential. Your BMR and TDEE calculations provide a baseline, but keep in mind that progress takes time. Aim for gradual, sustainable changes in your calorie intake and physical activity.

  • Monitor Your Progress: 

Tracking your daily calorie intake and expenditure is crucial for staying on track. There are various apps and fitness trackers available that can help you log your meals, exercise routines, and progress towards your goals. Regularly assessing your progress allows you to make necessary adjustments to your fitness plan.

  • Pay Attention to Nutrition: 

While calories are a critical factor, the quality of the calories you consume also matters. Focus on a well-balanced diet rich in whole foods, including lean proteins, fruits, vegetables, whole grains, and healthy fats. Avoid excessive consumption of empty-calorie foods like sugary snacks and drinks.

  • Stay Active: 

Incorporate regular physical activity into your routine. Your activity level, as factored into the TDEE calculation, plays a significant role in determining your daily calorie needs. Aim for a combination of cardiovascular exercise, strength training, and flexibility exercises to support your overall health and fitness goals.

  • Consult a Professional: 

If you're uncertain about creating a personalized fitness plan or have specific health concerns, consider consulting a registered dietitian, nutritionist, or fitness trainer. They can provide expert guidance tailored to your individual needs and goals.

  • Be Patient and Persistent: 

Remember that achieving your fitness goals is a journey, not a race. There may be times when progress seems slow or you encounter setbacks. Stay committed, stay patient, and stay persistent. Consistency is key to long-term success.




While the BMR calculator is a valuable tool, it does have its limitations:


  • Simplified Assumptions: 

BMR calculations are based on general population averages and formulas that make assumptions about activity levels and metabolism. Individual variations can be significant.

  • Doesn't Account for Muscle Mass: 

BMR calculators don't directly consider muscle mass, which can significantly impact your metabolic rate. Muscle burns more calories at rest than fat.

  • Changing Factors: 

Your BMR can change over time due to factors like aging, hormonal changes, and changes in muscle mass. Calculations based on your current data may become less accurate over time.

  • Not a Standalone Solution: 

The BMR calculator is just one piece of the puzzle. Nutrition, exercise, and lifestyle choices all play crucial roles in achieving your fitness goals.


1. How can I calculate my BMR?

You can calculate your Basal Metabolic Rate using the Harris-Benedict Equation or use online BMR calculators. These calculations typically require your age, gender, weight, and height as inputs.

2. Will I lose weight if I eat my BMR?

Eating at your BMR will generally maintain your current weight, as it represents the calories your body needs to function at rest. To lose weight, you need to create a calorie deficit by consuming fewer calories than your BMR or Total Daily Energy Expenditure (TDEE).

3. How do I calculate my BMR for weight loss?

To calculate your BMR for weight loss, first determine your BMR using the Harris-Benedict Equation or an online calculator. Then, create a calorie deficit by consuming fewer calories than your BMR, typically by 300 to 500 calories per day for gradual and sustainable weight loss.

4. How to lose weight with a BMR of 1500?

If your BMR is 1500 calories, you can lose weight by consuming fewer calories than this number. For example, aim for a daily calorie intake of 1200-1400 calories while incorporating regular physical activity. Consult a healthcare professional or dietitian for personalized guidance.

5. What is a good BMR for my age?

There's no one-size-fits-all answer to what constitutes a "good" BMR for your age, as BMR varies significantly among individuals. Factors such as genetics, muscle mass, and lifestyle play a role. Instead of comparing your BMR to others, focus on achieving a healthy weight and lifestyle that's right for you.

6. Can my BMR change over time?

Yes, your BMR can change due to various factors, including age, changes in muscle mass, hormonal fluctuations, and lifestyle changes. It's essential to periodically reassess your BMR as part of your fitness and weight management strategy.

7. Are there any limitations to the BMR calculator's accuracy?

Yes, BMR calculators provide estimations and are based on general population averages. They may not account for individual variations accurately. Factors like muscle mass, genetics, and certain medical conditions can influence your actual metabolic rate.


The BMR calculator is your secret weapon in the battle for a healthier you. It empowers you to take control of your calorie intake, whether you're on a mission to lose weight, gain muscle, or maintain your current physique. 


So, start crunching those numbers, make informed decisions about your daily calorie intake, and embrace the journey towards a fitter, healthier, and happier you. 


Remember, every step counts, and with the right knowledge and determination, you're well on your way to success in the world of fitness. 


Gymnation is here to support you every step of the way. Get started today and transform your life. Your future self will thank you for it!