Calorie calculator, BMI calculator, Ideal weight calculator

Your gender
Your height
Your weight
Your age
Your level of physical activity


The body mass index is used as an international unit of measurement, to measure the weight to height ratio.

The body mass index is not suitable for calculating your weight during pregnancy, for professional athletes and children up to 20 years of age. Body weight is considered normal, if the BMI is in the range of 18 up to 25, preferably within 20 – 25.

BMI value


< 13,00


< 16,00

Underweight (very thin)

16,0 – 16,9

Underweight (moderately slender)

< 17,00

Official indicator of mental anorexia

17,0 – 18,4


18,5 – 24,9

Normal weight

25,0 – 29,9

Overweight or overweight (is not considered a disease)

30,0 – 34,9

First degree obesity

35,0 – 39,9

Second degree obesity

≥ 40,0

Third degree obesity – extreme or very severe obesity


Basic metabolism

Basic metabolism (BMR – Basal Metabolic Rate) – is your basic or basal metabolism – amount of energy, what your body spends at rest in a neutral to moderate environment and in a post-absorption state (the digestive system is inactive – after about 12 hours of fasting).


Ideal weight

Ideal body weight (IBW – Ideal body weight) is the clinical standard, which includes biometric variables, including height, gender and age. To lieto, to determine the correct dose of medication prescribed for patients, and sports to determine body weight. Although the IBW formula is widely used in clinical settings, it is not a universal criterion for measuring the percentage of body fat and muscle mass, because it is different for each individual.

BMI or body mass index

BMI (Body mass index) – body mass index or Kittel index (Quetelet index) is the Belgian statistician Adolf Kittel (1796-1874) a method for calculating the degree of obesity of the human body has been invented. The body mass index indicates whether a person's body weight is healthy in relation to a person's height (length).

To calculate the body mass index need weight (kilograms) divide by the height of the square (meters).

World Health Organization (PVO) recommended healthy BMI range for both men, both women are from 18,5 up to 25. It is widely used in medicine as a rapid indicator of possible health complications. Usually, the higher the body weight, the greater the chance, that a person will suffer from health problems such as obesity, diabetes, heart disease and many more. Doctors use BMI, to inform their patients about possible health problems, notably, if there is a gradual increase in their BMI, and is currently the official figure, to classify persons according to different levels of obesity.

BMI ranges vary depending on factors such as region and age, and sometimes they are divided into sub-categories, for instance, very low weight or very severe obesity. Being overweight or underweight can have a significant impact on your health, that's why, although BMI is not a completely accurate method of calculating healthy body weight (because the relationship between muscle and fat mass is not taken into account) –

it is widely used in the initial diagnosis of healthy weight, because it is fast and accurate enough for 90-95% of people.


What to consider when interpreting the calculated BMI

Lai gan BMI (body mass index) is a widely used and useful indicator of healthy body weight, it has its limitations. Important to remember, that BMI is just a calculation, which does not take into account body composition. As body types, muscle, the distribution of bone mass and fat varies from person to person, BMI should be used in conjunction with other measurements, not as the only method for determining a healthy human body weight.


BMI differences in adults

BMI cannot be completely accurate, because it is a measure of body weight, not an indicator of excess body fat. BMI is also affected by factors such as age, sex, ethnicity, muscle and body fat mass and level of physical activity. For instance, in the elderly, the BMI may be in the healthy weight range, bet, if he is completely inactive in his daily life - possibly, that he has a significant amount of body fat.

On the other hand, for a young person with high muscle mass, BMI may indicate an unhealthy weight.

For athletes and people, who are physically active (muscle mass is higher compared to the average individual) the calculated BMI may be in the overweight range, because muscles are heavier than fat.

In most cases:

  • Older adults usually have more body fat than younger people with the same BMI.
  • Women tend to have more body fat than men with equivalent BMI.
  • Muscular individuals and trained athletes may have higher BMI due to higher muscle mass.

BMI differences in children and adolescents

The same BMI limiting factors apply to children and adolescents, what to adults. In addition, children's height and level of sexual maturation can affect BMI and body fat. BMI as an indicator of excess body fat is better in obese children than in overweight children, whose BMI could be affected by increased fat or non-fat mass (all body parts, excluding fat, which includes water, organs, muscles, etc.). In thin children, the difference in BMI may also be related to lean mass.


Classification of BMI results for children (2-20 years)

The weight calculator is designed to determine increasing BMI. For children (up to 20 years - while the body is growing) the calculation of the body mass index is identical, however, a more detailed classification scale is used (gender and age are taken into account, BMI is also calculated on a monthly basis. Children's BMI is formed, comparing data with other children of the same age in percentiles.).

Body mass index age precentiles 2 up to 20 years old boys

Body mass index age precentiles 2 up to 20 years for young girls


Basic metabolism calculator for basic metabolism (BMR) is used to calculate Harris-Benedict equation.

The Harris-Benedict equation was one of the first, which was used, to calculate the basal or basal metabolic rate (BMR – basal metabolic rate) – amount of energy, which the human body spends at rest in one day. The formula has been clarified 1984. and was practically the only calculation method used until 1990. year, when the Mifflin-St Jeor equation appeared.

The Katch-McArdle formula is slightly different, because it calculates energy consumption at rest and not at rest and takes into account lean body mass, which is not taken into account neither Miflina-Stjeor, not the Harris-Benedict equation. Of these equations, the Mifflin-St Jeor equation is considered to be the most accurate for calculating BMR, while the Katch-McArdle formula may be more accurate for humans, who are thinner and know their body fat percentage.


Mifflin-St Jeor equation

For men: BMR = 10 W + 6,25 H — 5A + 5

For women: BMR = 10 W + 6,25 H – 5A – 161


Revised Harris-Benedict equation

For men: BMR = 13,397 W + 4,799 H — 5,677 A + 88,362

For women: BMR = 9,247 W + 3,098 H — 4,330 A + 447,593


Katch-McArdle equation

BMR = 370 + 21,6 (1 – F)W



W is the body weight in kg

H is the body length in cm

A is age

F is the percentage of body fat


Ideal weight

Several formulas have been developed to determine the ideal weight and depending on which one is used in the calculations - the ideal weight for the same person can vary up to 10 kg. The calculator uses G. J. The formula published by Hamwi in 1964, which was originally used to determine the dose of medicine needed for a particular person.


What is your ideal weight?

Most of us have ever tried to lose weight, for some it has succeeded, for some no. The ideal weight can be determined in different ways - for some it is the weight at which their physical well-being is best, for others, at what weight they feel best emotionally.

Nowadays, the idea of ​​an ideal body weight is based on the visual appeal created by the media., respectively - the ideal of beauty is a variable, for example, a few hundred years ago it was a round pale aristocrat compared to the ravens and tanned peasants -😊.

Ideal body weight (IBW – Ideal body weight) the concept was introduced, to determine the dosages and formulas of the medications required for a particular person, who calculates it, were not related to it, how a person looks or feels physically and emotionally at a given weight (drug doses are based on IBW, not on total body weight). Today, IBW is also widely used outside of medicine, for instance – sports in which athletes are classified according to their body weight (weight categories).

Note, that IBW is not an ideal measurement, because it does not take into account the percentage distribution of body fat and muscle in the human body. That means, that the ideal body weight for athletes and physically active people is higher than calculated. Remember, that the calculated ideal weight does not necessarily indicate health or indicate weight, which a person must definitely aim for – possible, that your IBW may be above or below the calculated and you are also completely healthy.

How accurately one should weigh for each individual is not precisely determined. It largely depends on each individual. There is no measure yet, not IBW – ideal body weight, what BMI – body mass index or something else, which could be accurately identified, how much a person should weigh, to be healthy. All of these methods are good for initial diagnosis, but if they indicate an unhealthy body weight, Before you consider which diet to choose - first consult your doctor.

To maintain your health it is more important to follow a healthy lifestyle and basic principles of healthy eating, than to strive for a certain weight, based on a generalized formula. Maintaining a healthy weight can help, for instance – regular physical activity, use of fresh rather than industrially processed products in their diet, enough sleep, etc..


The main factors influencing the ideal weight


Theoretically, age should not significantly affect IBW girls after 14 -15 years of age and boys aged 16-17 years, when most people stop growing. It is important to remember, that male and female height up 70 age decreases by 3.8 – 5 cm and people aging, muscle mass decreases and excess body fat accumulates more easily. This is a natural process, but it is possible to slow it down, for instance, with a healthy diet, physical activity and adequate sleep.


Generally, women weigh less than men, although they naturally have a higher percentage of body fat. That's because, that a man's body usually has more muscle mass and the muscles are heavier than fat. Women also tend to have lower bone density and are taller than men.


The taller a person, the higher their muscle and body fat mass, resulting in weight gain. If a man and a woman are the same height (by length) – for a man, should be about 10-20% heavier.

Body type

Body type (skeletal bone size) is another factor, which may affect the determination of the ideal weight (within a few kg). It is usually classified as small, medium or large (fine bones, medium wide bones, plati statement). It is measured, based on the circumference of the human wrist in relation to height. You can see how to properly measure the circumference of your wrist HERE. The classification is as follows:

For women, of a height of less than 158.5 cm
  • Fine bones = wrist size less than 12.7 cm.
  • Medium wide bones = wrist size from 12.7 cm to 14.6 cm.
  • Wide bones = wrist size greater than 14.6 cm.
For women, whose height is in the range of 158.5 up to 167.6 cm
  • Fine bones = wrist size less than 15.2 cm.
  • Medium wide bones = wrist size from 15.2 cm to 15.9 cm.
  • Wide bones = wrist size greater than 15.9 cm.
For women, whose height is above 167.6 cm
  • Fine bones = wrist size less than 15.9 cm.
  • Medium wide bones = wrist size from 15.9 cm to 16.51 cm.
  • Wide bones = wrist size greater than 16.51 cm.
For men, whose height is above 167.6 cm
  • Fine bones = wrist size from 14 cm to 16.5 cm.
  • Medium wide bones = wrist size from 16.5 cm to 17.8 cm.
  • Wide bones = wrist size greater than 17.8 cm.

A person with wide bones, of course, weighs more than a man of the same length with fine bones – this applies to both IBW, both BMI calculations.


The most popular formulas for determining the ideal weight

The formulas differ in the values ​​used, based on the research and findings of the scientists involved in their development. The Devine formula is the most widely used formula for measuring IBW.

J. Hamwi formula (1964)

It was developed for drug dosing purposes.

For men: 48,0 kg + 2,7 kg per inch above 5 feet

For women: 45,5 kg + 2,2 kg per inch above 5 feet

J. Become a formula (1974)

Similar to Hamwi's formula, it was originally intended to calculate the dose of the medicine, based on human weight and height. Over time, the formula became a universal method of calculating IBW.

For men: 50,0 kg + 2,3 kg per inch above 5 feet

For women: 45,5 kg + 2,3 kg per inch above 5 feet

J.D.. Robinson's formula (1983)

Modification of the Devine formula.

For men: 52 kg + 1,9 kg per inch above 5 feet

For women: 49 kg + 1,7 kg per inch above 5 feet

R. Miller's formula (1983)

Modification of the Devine formula.

For men: 56,2 kg + 1,41 kg per inch above 5 feet

For women: 53,1 kg + 1,36 kg per inch above 5 feet


Calorie calculator

Calorie counting is a generally accepted and very effective method of weight control. Each food package has exactly how many calories per 100g of a particular product - this makes counting calories relatively easy.


How many calories do you need

Usually people start to get interested in energy consumption and calorie counting in order to reduce their weight, in the easiest way, how to lose weight is to consume fewer calories every day.

But how many calories does the body need, so that it is intact and able to function normally? It largely depends on age, respond, height, gender and level of physical activity – so it is different for each person.

For instance, physically active 25 years a young 180 cm tall man needs significantly more calories than 160 cm steam, 70 an elderly woman with a sedentary lifestyle. For adult men, maintaining your weight usually requires 2000-3000 calories a day, in turn for adult women – about 1,600 to 2,400 calories.

The body does not need many calories, to just survive. However, consuming too few calories, the body malfunctions, because of energy (calories) is used only for vital functions. Several studies show, that women should take at least 1200 calories, but for men – at least 1500 calories per day.

It is usually difficult for a layman to determine how many calories in a matter of days he needs to maintain his weight., to lose weight without harming health or, to gain weight. Calorie Calculator calculates the amount of calories needed first by calculating the Basic Metabolism, which is multiplied by the physical activity factor (1,2–1,95).

The amount of calories needed for gradual weight loss is calculated by applying 15% calorie deficit, but for rapid weight loss - 30% calorie deficit. It is not recommended to reduce your calorie intake by more than 30% day, already weight loss too fast is harmful to health and slowing down the metabolism in the near future can have the opposite effect - regaining weight.

It is important to remember, that a proper and balanced diet for weight loss is especially important, because if the body is deprived of the nutrients it needs can start both health, both beauty problems (skin, like, hair health).



Official website of the US Centers for Disease Control and Prevention.