BMR Calculator (Basal Metabolic Rate) | Calculate BMR- Online Free (2024)

What is BMR & How to Calculate this?

BMR Calculator: Full form of BMR is “Basal Metabolic Rate“; BMR is the amount of energy required by our body to perform essential tasks and functions. Basal metabolic rate (BMR) for any person is calculated on the basis of Age, Weight, Height and Gender. If you check online, you will find a number of tools used to calculate your BMR easily. BMR is calculated on the basis of the different formulas given by- Harris-Benedict Equation, Mifflin St Jeor equation and Katch–McArdle formula. So, we have developed a simple online tool to calculate your BMR; you need to enter your age, select the units (US or Metric), Enter weight and Height and you are done.

BMR Calculator (Basal Metabolic Rate) | Calculate BMR- Online Free (1)

This tool will automatically Calculate BMR. People generally search for bmr calculator to lose weight in UK, Australia, Canada, US, India and more even worldwide. Use Our Fee tool and Calculate BMR to stay healthy.

BMR is calculated on the following formulas-

  • Mifflin St Jeor equation and
  • Harris-Benedict Equation,
  • Katch–McArdle formula

Mifflin St Jeor Equation for BMR Calculator

Mifflin St Jeor Equation is the most widely used to calculate BMR (Basal Metabolic Rate). The following equations are for Metric Units (Weight in Kg and Height in cm).

  • Mifflin St Jeor Eq. for Male- (10 × Weight in Kg)+(6.25 × Height in cm)-(5 × Age in Years) + 5
  • Mifflin St Jeor Eq. for Female-(10 × Weight in Kg)+(6.25 × Height in cm)-(5 × Age in Years) – 161

Factors Affecting BMR– weight, Age, Sex, Genetics, Exercise, Body temperature, Environment temperature, Hormones and Pregnancy.

The following equations are for Imperial Units (Weight in Pounds and Height in Inches).

  • Mifflin St Jeor Eq. for Male- (10 × Weight in Kg)+(6.25 × Height in cm)-(5 × Age in Years) + 5
  • Mifflin St Jeor Eq. for Female-(10 × Weight in Kg)+(6.25 × Height in cm)-(5 × Age in Years) – 161

Harris-Benedict Equation for BMR Calculator

This is one of the popular/ notable formula published in 1919. Harris-Benedict Equation for Male and Female is given below. The following equations are for US Units (Weight in Pounds and Height in Inches).

  • Harris-Benedict Equation for Male- (4.536 × weight in pounds) + (15.88 × height in inches) − (5 × age) + 5.
  • Harris-Benedict Equation for Female- (4.536 × weight in pounds) + (15.88 × height in inches) − (5 × age) − 161.

Calculate TDEE (Total Daily Energy Expenditure)

TDEE is the total energy that a person requires in a day. Although, TDEE is very hard to measure accurately as it depends on MBR (Basal Metabolic Rate). Here is the way to calculate TDEE using BMR and exercise done per dayBMR Calculator (Basal Metabolic Rate) | Calculate BMR- Online Free (2)

Physical Exercise / Activity LevelTDD Required (Based on BMR)
Little/ No exerciseBMR × 1.2 = TDEE required
Light exercise (1-3 days/ week)BMR × 1.375 = TDEE required
Moderately Active (3-5 days/ week)BMR × 1.55 = TDEE required
Very active (6-7 days/ week)BMR × 1.725 = TDEE required
Extremely active (very heavy active & physical job/ training)BMR × 1.9 = TDEE required

BMR Variables (Basal Metabolic Rate)

There are various factors which affects BMR and metabolism-

  • Age – As you getting older, your BMR generally slows and more energy is required by your muscles.
  • Genetics – Sometimes genetic disorders may affect metabolism and m,ay results in faster BMR than others.
  • Weather/ Temp. – Weather also affect BMR; Increase/ decrease in temperature may force your body to work harder to maintain its temperature and results in higher BMR.
  • Diet/ Food – Food has a big influence on your BMR, What you Eat and When you Eat, matters a lot.
  • Pregnancy – Pregnant women tends to eat more then usual; and their Harmon changes during pregnancy may increase/ decrease metabolism.
  • Supplements/ Drugs – If a person uses Supplements or Drugs like- Caffeine and more, generally increase the BMR.

What is Rest Metabolic Rate (RMR)

Rest Metabolic Rate (RMR) is the amount of energy required by your body to function/ perform essential functions while at rest. In simple terms- calories your body burns while at rest. The essentials functions are– breathing, heart beating, circulating blood, basic brain functions, food digestion and sustaining the function of vital organs.BMR Calculator (Basal Metabolic Rate) | Calculate BMR- Online Free (3)

People Generally Search for following terms related to Calculate BMR– bmr calculator, basal metabolic rate, basal rate of metabolism, calculate basal metabolic rate, basal metabolic rate calculator, what is bmr, what is the bmr.

How do I calculate my BMR?

BMR can be calculated on the basis of Age, Height and Weight, One needs to enter these details and our online tool automatically calculates BMR for both male and female.

What is a good BMR for my age?

Most people’s BMR is between 1000 to 2000 and this means that- they need to take in between 1000 to 2000 calories/day to perform essential tasks and functions while in rest.

Which BMR method is best?

Out of the above discussed three methods- Mifflin St Jeor equation is considered as the most accurate and popular formula for BMR calculation.

BMR Calculator (Basal Metabolic Rate) | Calculate BMR- Online Free (2024)

FAQs

What is the most accurate BMR calculator? ›

Of these equations, the Mifflin-St Jeor Equation is considered the most accurate equation for calculating BMR with the exception that the Katch-McArdle Formula can be more accurate for people who are leaner and know their body fat percentage.

What is a normal basal metabolic rate? ›

Maintaining lean muscle mass also helps reduce the chance of injury when training, and exercise increases your daily energy expenditure. An average man has a BMR of around 7,100 kJ per day, while an average woman has a BMR of around 5,900 kJ per day.

What is the basal metabolic rate for a woman? ›

Typically, BMR is between 1,000 and 2,000, meaning you need 1,000 to 2,000 calories to fuel basic functions. BMR for women average around 1,400, while BMR for men average between 1,600 and 1,800.

How do I use my BMR to lose weight? ›

The BMR number tells you the calories you need at rest, to that number you need to add exercise/activity to figure out how many calories you need daily (your TDEE). Once you have figured that final number out, you then need to create a calorie deficit to lose weight.

Does BMR go up or down with weight loss? ›

The calories needed for maintaining basal (resting phase) metabolism are called basal metabolic rate (BMR). BMR increases with a decrease in body weight to about 0.02 kcal/min, corresponding to each 1% decrease in body weight.

How many calories should I eat to lose weight if my BMR is 1600? ›

For example, if your BMR is 1,600 (the average BMR for men) and you're very active, your AMR would be 3,040 (1,600 x 1.9). A pound of fat is equal to about 3,500 calories. So, if you wanted to lose one pound per week, you would need to eat 500 calories less per day (3,500/500 = 7).

Do I need to eat 500 calories less than my BMR? ›

So, at the end of the day, eating below your BMR isn't inherently bad, but you generally want to avoid very-low-calorie dieting of any kind. If you want to lose weight without running into metabolic hobgoblins, severe hunger, or muscle loss, aim to maintain a calorie deficit of around 20 to 25% below your TDEE.

What is a healthy BMR score? ›

What is my average BMR? Most men have a BMR of about 1,600 to 1,800 kCals a day. Most women have a BMR of 1,550 kCals a day. If you are above 40, your average BMR is probably only 1,200 kCals a day.

How can I lose weight if my BMR is 1400? ›

How Many Calories Should I Eat Daily to Lose Weight? For example, if your BMR is 1,400 (the average for American women) and you are moderately active, your AMR would be 2,170 (1,400 x 1.55). Since a pound of fat is equal to 3,500 calories, you would need to cut 500 calories per day to lose a pound per week.

What happens if I eat below my BMR? ›

And finally, remember that muscle is metabolically active tissue. The more muscle you have, the higher your BMR will be. Eating under your BMR is a great way to lose weight, as long as you do it in a healthy way.

What naturally happens to BMR as you age? ›

Age: You lose muscle as you get older, which slows down the metabolism. Sex: People assigned male at birth (AMAB) tend to have faster metabolisms than people assigned female at birth (AFAB).

Do I want my BMR to be high or low? ›

There is no 'good BMR'. Everybody's BMR is different. It is influenced by age, gender, body size, height, weight, and mass – even the size of your internal organs. A low BMR means you need fewer calories in order to sustain life-giving functions like breathing.

How do you get your Basal Metabolic Rate checked? ›

Metabolic testing is typically done in several parts and almost always includes a calorimetry test. This test takes 15 to 30 minutes and is done while you're reclining. The equipment used may vary. Some calorimetry tests use a mouthpiece you breathe into.

How does Apple Watch calculate Basal Metabolic Rate? ›

The Apple Watch likely uses the Harris-Benedict Equation which uses your age, height, weight and gender to calculate your Basal Metabolic Rate. The caloric figure from this equation is then added to your Active calories to get your Total Calories.

What is the formula for resting metabolic rate? ›

RMR = (9.99 X actual weight*)+ (6.25 X height*) – (4.92 X age) – 161*use weight in kilograms (kilogram), height in centimeters (cm). SedentaryLight physical activity associated with typical day-to-day life.

What is my metabolic age calculator? ›

In order to know your metabolic age, you must know your BMR. To get an idea, the most common formula is: For Men: BMR = 10 x weight (kg) + 6.25 x height (cm) – 5 x age (years) + 5. For Women: BMR = 10 x weight (kg) + 6.25 x height (cm) – 5 x age (years) – 161.

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