BMR Calculator
BMR is evaluated from Weight, Height and Age. The calculation reports BMR, BMR and BMR.
Results
Thanks — we’ve logged this for review.
About the BMR Calculator
### Why Use the BMR Calculator Calculator?
The BMR Calculator is a valuable tool for anyone looking to understand their body's energy needs. By calculating an individual's Basal Metabolic Rate (BMR), this calculator provides a foundation for determining daily calorie needs, planning diets, and tracking changes in metabolic rate over time. For people trying to lose weight or maintain weight loss, understanding their BMR is vital. It helps them set realistic calorie goals and make informed decisions about their diet and exercise routine. The BMR Calculator is also useful for athletes and individuals who engage in regular physical activity, as it allows them to estimate their daily energy expenditure and ensure they are fueling their body adequately. By using the BMR Calculator, users can gain a better understanding of their body's energy needs and make data-driven decisions to achieve their health and fitness goals.
### History of the BMR Calculator
The concept of Basal Metabolic Rate (BMR) has been around for over a century. The first BMR formula was developed by James Arthur Harris and Francis Gano Benedict in 1919. This formula, known as the Harris-Benedict equation, used sex, age, weight, and height to estimate an individual's BMR. In the 1990s, a new formula was developed by Mifflin and St Jeor, which is considered more accurate than the Harris-Benedict equation. The Mifflin-St Jeor equation uses the same variables as the Harris-Benedict equation but applies different coefficients to calculate BMR. The Katch-McArdle formula, developed in the 1990s, uses body fat percentage to estimate BMR. These formulas have been widely used in the field of nutrition and exercise science to estimate energy needs and plan diets. The BMR Calculator uses these formulas to provide users with an accurate estimate of their BMR.
### The Science Behind the Calculations
The BMR Calculator uses three different formulas to estimate an individual's BMR: the Mifflin-St Jeor equation, the Harris-Benedict equation, and the Katch-McArdle formula. The Mifflin-St Jeor equation is considered the most accurate and is calculated as follows:
BMR (men) = 10 x weight (kg) + 6.25 x height (cm) - 5 x age (years) + 5
BMR (women) = 10 x weight (kg) + 6.25 x height (cm) - 5 x age (years) - 161.
The Harris-Benedict equation is calculated as follows:
BMR (men) = 66 + 13.75 x weight (kg) + 5.003 x height (cm) - 6.755 x age (years)
BMR (women) = 655 + 9.563 x weight (kg) + 1.850 x height (cm) - 4.676 x age (years).
The Katch-McArdle formula uses body fat percentage to estimate BMR and is calculated as follows:
BMR (men and women) = 370 + 21.6 x lean body mass (kg).
These formulas use variables such as weight, height, age, and body fat percentage to estimate an individual's BMR. By using these formulas, the BMR Calculator provides users with an accurate estimate of their daily energy needs.
### Real-Life Application and Examples
Let's consider an example of how the BMR Calculator can be used in real life. Suppose we have a 30-year-old male who weighs 75 kg and is 175 cm tall. He wants to lose weight and is looking for a way to estimate his daily calorie needs. By using the BMR Calculator, he can input his weight, height, and age to get an estimate of his BMR. Based on the Mifflin-St Jeor equation, his BMR would be approximately 1984 kcal/day. This means that his body needs approximately 1984 calories per day to function at rest. By using this information, he can plan his diet and exercise routine to achieve his weight loss goals. For example, if he wants to lose 0.5 kg per week, he can aim for a daily calorie deficit of 500 kcal by eating 1484 kcal per day and burning an additional 500 kcal through exercise. By using the BMR Calculator, he can make informed decisions about his diet and exercise routine and achieve his weight loss goals in a healthy and sustainable way.
The BMR Calculator is a valuable tool for anyone looking to understand their body's energy needs. By calculating an individual's Basal Metabolic Rate (BMR), this calculator provides a foundation for determining daily calorie needs, planning diets, and tracking changes in metabolic rate over time. For people trying to lose weight or maintain weight loss, understanding their BMR is vital. It helps them set realistic calorie goals and make informed decisions about their diet and exercise routine. The BMR Calculator is also useful for athletes and individuals who engage in regular physical activity, as it allows them to estimate their daily energy expenditure and ensure they are fueling their body adequately. By using the BMR Calculator, users can gain a better understanding of their body's energy needs and make data-driven decisions to achieve their health and fitness goals.
### History of the BMR Calculator
The concept of Basal Metabolic Rate (BMR) has been around for over a century. The first BMR formula was developed by James Arthur Harris and Francis Gano Benedict in 1919. This formula, known as the Harris-Benedict equation, used sex, age, weight, and height to estimate an individual's BMR. In the 1990s, a new formula was developed by Mifflin and St Jeor, which is considered more accurate than the Harris-Benedict equation. The Mifflin-St Jeor equation uses the same variables as the Harris-Benedict equation but applies different coefficients to calculate BMR. The Katch-McArdle formula, developed in the 1990s, uses body fat percentage to estimate BMR. These formulas have been widely used in the field of nutrition and exercise science to estimate energy needs and plan diets. The BMR Calculator uses these formulas to provide users with an accurate estimate of their BMR.
### The Science Behind the Calculations
The BMR Calculator uses three different formulas to estimate an individual's BMR: the Mifflin-St Jeor equation, the Harris-Benedict equation, and the Katch-McArdle formula. The Mifflin-St Jeor equation is considered the most accurate and is calculated as follows:
BMR (men) = 10 x weight (kg) + 6.25 x height (cm) - 5 x age (years) + 5
BMR (women) = 10 x weight (kg) + 6.25 x height (cm) - 5 x age (years) - 161.
The Harris-Benedict equation is calculated as follows:
BMR (men) = 66 + 13.75 x weight (kg) + 5.003 x height (cm) - 6.755 x age (years)
BMR (women) = 655 + 9.563 x weight (kg) + 1.850 x height (cm) - 4.676 x age (years).
The Katch-McArdle formula uses body fat percentage to estimate BMR and is calculated as follows:
BMR (men and women) = 370 + 21.6 x lean body mass (kg).
These formulas use variables such as weight, height, age, and body fat percentage to estimate an individual's BMR. By using these formulas, the BMR Calculator provides users with an accurate estimate of their daily energy needs.
### Real-Life Application and Examples
Let's consider an example of how the BMR Calculator can be used in real life. Suppose we have a 30-year-old male who weighs 75 kg and is 175 cm tall. He wants to lose weight and is looking for a way to estimate his daily calorie needs. By using the BMR Calculator, he can input his weight, height, and age to get an estimate of his BMR. Based on the Mifflin-St Jeor equation, his BMR would be approximately 1984 kcal/day. This means that his body needs approximately 1984 calories per day to function at rest. By using this information, he can plan his diet and exercise routine to achieve his weight loss goals. For example, if he wants to lose 0.5 kg per week, he can aim for a daily calorie deficit of 500 kcal by eating 1484 kcal per day and burning an additional 500 kcal through exercise. By using the BMR Calculator, he can make informed decisions about his diet and exercise routine and achieve his weight loss goals in a healthy and sustainable way.
Formula & How It Works
The calculation applies the following relations exactly as recorded in the metadata: Mifflin-St Jeor: Men: BMR = 10W + 6.25H - 5A + 5 Women: BMR = 10W + 6.25H - 5A - 161 Harris-Benedict (revised): Men: BMR = 13.397W + 4.799H - 5.677A + 88.362 Women: BMR = 9.247W + 3.098H - 4.330A + 447.593 Katch-McArdle (estimated from Mifflin, assumes ~20% body fat): LBM = W x 0.80 BMR = 370 + 21.6 x LBM Where W = weight in kg, H = height in cm, A = age in years Each output field is produced by substituting the supplied inputs into the relevant relation and then applying the declared rounding or text format.
Worked Examples
Example 1: Active Young Male
Inputs
weight_kg: 80
height_cm: 180
age: 25
gender: male
BMR: 1,805 kcal/day. BMR: 1,882 kcal/day. BMR: 1,805 kcal/day
With Weight = 80, Height = 180, Age = 25 and Gender = male as the stated inputs, the result is BMR = 1,805 kcal/day, BMR = 1,882 kcal/day and BMR = 1,805 kcal/day. Each value corresponds to the declared output fields.
Example 2: Middle-Aged Woman, Weight Management
Inputs
weight_kg: 68
height_cm: 163
age: 45
gender: female
BMR: 1,313 kcal/day. BMR: 1,387 kcal/day. BMR: 1,313 kcal/day
With Weight = 68, Height = 163, Age = 45 and Gender = female as the stated inputs, the result is BMR = 1,313 kcal/day, BMR = 1,387 kcal/day and BMR = 1,313 kcal/day. Each value corresponds to the declared output fields.
Example 3: Elderly Male, Reduced Metabolism
Inputs
weight_kg: 72
height_cm: 172
age: 70
gender: male
BMR: 1,450 kcal/day. BMR: 1,481 kcal/day. BMR: 1,450 kcal/day
With Weight = 72, Height = 172, Age = 70 and Gender = male as the stated inputs, the result is BMR = 1,450 kcal/day, BMR = 1,481 kcal/day and BMR = 1,450 kcal/day. Each value corresponds to the declared output fields.
Example 4: Overweight Female, Dieting
Inputs
weight_kg: 95
height_cm: 168
age: 38
gender: female
BMR: 1,649 kcal/day. BMR: 1,682 kcal/day. BMR: 1,649 kcal/day
With Weight = 95, Height = 168, Age = 38 and Gender = female as the stated inputs, the result is BMR = 1,649 kcal/day, BMR = 1,682 kcal/day and BMR = 1,649 kcal/day. Each value corresponds to the declared output fields.
Common Use Cases
- Determine baseline calorie needs at rest
- Use as foundation for TDEE and diet calculations
- Compare metabolic rate changes with weight loss