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BMR Calculator: Find Out How Many Calories Your Body Burns
Want to know how many calories your body burns without doing anything at all? Our free BWW BMR calculator gives you that number in seconds. Just enter your age, height, weight, and gender, and the tool shows your Basal Metabolic Rate along with your daily maintenance calories. No sign up, no app download, and no confusing math. It works on mobile and desktop and gives instant, accurate results.
What Is BMR (Basal Metabolic Rate)?
BMR stands for Basal Metabolic Rate. It is the number of calories your body needs just to stay alive if you did nothing all day. This means no walking, no talking, no exercise, just lying in bed and breathing. Your heart still beats, your lungs still work, your brain still thinks, and your body still repairs cells. All of that needs energy, and that energy is your BMR.
Think of your body like a car parked with the engine idling. Even if the car does not move an inch, it still burns fuel to keep running. Your body works the same way. BMR usually makes up 60 to 70 percent of the total calories you burn in a day, which makes it one of the most important numbers in fitness and weight management.
Why Should You Know Your BMR?
Once you know your BMR, you can figure out your TDEE (Total Daily Energy Expenditure), which adds your daily activity on top of your BMR. This gives you the real number of you burn each day, and from there you can set a smart calorie target for your goal.
Once you have that target, use our Nutrition Calculator to see how BWW menu items fit into your daily plan, or browse our full Calories & Nutrition Guide to check every wing, side, and sauce before you order.
How Our BMR Calculator Works
This calculator uses two of the most trusted formulas in the fitness world: the Mifflin-St Jeor Equation and the Harris-Benedict Equation. Both formulas were built using scientific research on thousands of people, and health experts including the American Council on Exercise consider the Mifflin-St Jeor Equation the most accurate option available today.
Mifflin-St Jeor Equation:
- Men: (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
- Women: (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161
Harris-Benedict Equation:
- Men: 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) − (5.677 × age)
- Women: 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) − (4.330 × age)
Our tool lets you switch between both formulas with one tap, so you can compare results and pick the one you trust most.
How to Use the BMR Calculator (Step by Step)
Using this tool takes less than a minute. Even a beginner can do it without any help. Just follow these simple steps:
- Select your gender. Tap either Male or Female at the top of the form. This matters because men and women burn calories differently due to muscle mass and hormones.
- Enter your age. Type your age in years in the age box.
- Enter your height. Type your height and pick your unit, either centimeters (cm) or feet (ft). Tap the unit switch anytime to change it, and the number updates automatically.
- Enter your weight. Type your weight and choose kilograms (kg) or pounds (lb). Just like height, switching units instantly converts your number for you.
- Choose your activity level. Pick from Sedentary, Light, Moderate, Active, or Very Active based on how much you exercise in a normal week.
- Pick your formula. Choose Mifflin-St Jeor or Harris-Benedict. If you are not sure which one to pick, Mifflin-St Jeor is the safer and more modern choice.
- Tap Calculate. Your BMR number appears instantly on the scoreboard along with a percentage gauge and a full maintenance calorie table.
That’s it. No login, no email, and no waiting. The tool recalculates every time you change a value, so you can test different scenarios in real time.
BMR vs TDEE: What's the Difference?
People often mix up BMR and TDEE, but they are not the same thing. BMR is the calories you burn doing absolutely nothing, while TDEE is the calories you burn living your normal life, including walking, working, and exercising. TDEE is calculated by multiplying your BMR by an activity multiplier, which is exactly what the maintenance table in this calculator already does for you.
Here are the standard activity multipliers used to calculate TDEE from BMR
|
Activity Level
|
Description
|
Multiplier
|
|---|---|---|
|
Sedentary
|
Little or no exercise
|
1.2
|
|
Light
|
Exercise 1–3 days a week
|
1.375
|
|
Moderate
|
Exercise 3–5 days a week
|
1.55
|
|
Active
|
Exercise 6–7 days a week
|
1.725
|
|
VeryActive
|
Hard exercise or a physical job daily
|
1.9
|
Never try to eat at your BMR number to lose weight faster. Eating below your BMR for a long time can slow down your metabolism and harm your health. Always use your TDEE, not your BMR, as your actual calorie target.
What Affects Your BMR?
Your BMR is not the same as anyone else’s, even if you are the same age or weight. Several factors decide your personal number:
- Age: BMR naturally drops as you get older because muscle mass decreases over time.
- Gender: Men usually have a higher BMR than women because they typically carry more muscle mass. Muscle
- Mass: Muscle burns more calories at rest than fat, so a more muscular body has a higher BMR.
- Height and Weight: Taller and heavier bodies generally need more energy to function, which raises BMR.
- Genetics: Some people are simply born with a naturally faster or slower metabolism.
- Body Temperature and Weather: Cold weather can raise your BMR slightly because your body works harder to stay warm.
How to Increase Your BMR Naturally
While you cannot fully control your BMR, you can influence it with the right habits:
- Build muscle through strength training. Muscle tissue burns more calories than fat, even while you rest.
- Eat enough protein. Digesting protein burns more calories than digesting carbs or fat, and it also helps preserve muscle.
- Avoid extreme low calorie diets. Eating too little for too long can force your body to slow down its metabolism to save energy.
- Stay active throughout the day. Small movements like walking add up and support a healthier metabolism over time.
- Get enough sleep. Poor sleep can disturb hormones that control metabolism and hunger.
Frequently Asked Questions About Our BMR Calculator
There is no single “good” BMR because it depends on your
age, gender, height, and weight. On average, men often have a BMR between 1,600 and
1,800 calories, while women often fall between 1,300 and 1,500 calories. Your own number is personal to your body.
No. BMR only tells you the calories your body burns at complete rest. To find out how much you should actually eat, you need your TDEE, which adds your daily activity level on top of your BMR.
Mifflin-St Jeor is widely considered the more accurate formula for most people today. Harris-Benedict is older and was created in 1919, later revised in 1984, while Mifflin-St Jeor was developed in 1990 using more modern research.
Yes. Simply tap the unit toggle next to height and weight to switch between metric and imperial units. The tool converts your numbers automatically without losing accuracy.
Exercise itself does not directly raise BMR, but strength training builds muscle over time, and more muscle mass leads to a higher resting BMR in the long run.
BMR and RMR (Resting Metabolic Rate) are very similar. BMR is measured under strict lab conditions after fasting and full rest, while RMR includes a small amount of energy used for basic movement, so RMR is usually slightly higher than BMR.
Men typically carry more muscle mass and less body fat than women on average, and muscle burns more calories at rest. This is the main reason the formulas add a positive adjustment for men and a negative one for women.
Yes, this calculator is completely free with unlimited use. There is no signup, no app download, and no hidden cost involved.
It is a good idea to recalculate your BMR whenever your weight changes by more than 5 to 10 percent, or after a few months of consistent training, since your body composition changes over time
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