How to calculate the body weight of a child. Calculator for weight and height of the child. Reasons for underweight. Arithmetic formulas for calculations

These figures cannot be accurate, everyone knows that children can be born both 2500 and 4500, and are only indicative.

The fetal weight norm is almost the same for all women in the early stages, but with an increase in pregnancy, the individual difference becomes more and more. However, before giving birth, everyone really wants to know for sure whether the baby is large, it depends on how the birth will proceed.

Determination of fetal weight using external measurements

Obstetricians-gynecologists have special calculation formulas that allow you to estimate the size, weight and size of the fetus in late pregnancy. You can independently, using simple calculations, calculate the weight of the fetus at 32 weeks and later using them. They are very inaccurate, for this reason, do not rely too much on the result.

Basic fetal weight formula:

Coolant x WDM
Multiply the abdominal circumference by the height of the uterine fundus (in centimeters). For example, the weight of a fetus at 33 weeks in a woman with an abdominal circumference of 86 cm and a standing height of the uterine fundus of 33 cm will be 2838 grams, +/- 200 grams, according to this formula. However, these calculations can be influenced by many things, for example, physique, the amount of amniotic fluid, the position of the baby in the uterus.

To clarify the result, the weight of the fetus is calculated using two additional formulas:

Coolant + WDM x 100
The sum of the abdominal circumference and the height of the fundus of the uterus must be divided by 4 and multiplied by 100, in the previous example it turns out, (86 + 33) / 4 * 100 \u003d 2950 grams.

The third formula takes into account the physique of a woman, the so-called Solovyov index is used, the circumference of the wrist. If it is more than 16 cm, 12 cm is subtracted, if it is less than 16 cm, 11 cm is subtracted.

(WDM - 12 or 11) x 155
The height of the uterine fundus, from it you need to subtract the coefficient (11 or 12) and multiply by 155, we get the weight in the previous version of the calculation of 3255 or 3410 grams, depending on the Soloviev index.

All the results obtained by the three formulas must be added and divided by three. It is clear that the accuracy of such calculations leaves much to be desired.

Fetal weight by ultrasound

You can most accurately calculate the estimated weight of the fetus by ultrasound, measurements that are carried out using ultrasound allow you to calculate the weight with great accuracy, while at the same time you can find out the correspondence of individual parameters to the gestational age.

Ultrasound tables, which indicate the norm of fetal weight by weeks with ultrasound, are very voluminous, we have brought them into a service that will allow you to find out the weight of the child and his height, simply by entering data from the ultrasound examination protocol.

In order to get the result, you need, at least, to have this protocol on hand.

You will need:

Know your gestational age in weeks of BPD, this is the biparietal head size, you can also use the LHR, the frontal-occipital head size, or the baby's head circumference (OH).
- Coolant - the circumference of the child's abdomen
- DLB, child's thigh length
- DHrK - the diameter of the child's chest

For the calculation, all fields must be filled in, if your protocol does not indicate the circumference of the abdomen or the diameter of the chest, instead of them you can substitute the diameter of the chest or the circumference of the abdomen, respectively.

Determination of fetal weight by ultrasound does not depend on the amount of amniotic fluid, the position of the fetus in the uterus, and even the number of fetuses. The calculation of the weight of the fetus by ultrasound is closest to the real weight of the child at birth.

How to interpret the results obtained? So, you calculated the weight of the fetus, or looked at the table, or found out using an ultrasound scan. And you see that it doesn't match what was expected.

The norm of fetal weight by week may not correspond to your calculations, both upward and downward, and the longer the gestation period, the greater this difference may be.

In the early stages of pregnancy, the approximate weight of the fetus may be less or more than the calculated one only in cases where you made a mistake with the gestational age. In the future, the weight gain of the fetus depends on heredity, the state of the placenta, and other factors. Before childbirth, the normal fetal weight varies widely, and 2500 and 4500 may be the norm.

What does the weight of the fetus depend on?

From heredity
- on the nature of the diet, health status and the presence of bad habits in the mother
- from the peculiarities of the course of this pregnancy
- on the number of fruits.

With twins, the lag in fetal weight begins at about 20 weeks, and this trend continues until delivery. The weight of twins at birth is always less than the norm by about 1-2 weeks, in relation to those indicators given by the table of fetal weight by weeks. Now you know how to determine the weight of the fetus during pregnancy, you can constantly use the fetal weight formula, or you can use our ultrasound fetal weight calculator.

Fetal weight calculator

The calculator of the ratio of weight and height of a child allows you to identify health problems in time and, if possible, eliminate them. During the analysis, you will find out if your child is really underweight or overweight, whether he is growing and developing correctly. You can also use the calculator to find out the child's body mass index (BMI) from birth to 18 years old. Fill in all the fields of the form and click "CALCULATE"

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What is the importance of the ratio of height and weight of a child

In the development of a child, indicators such as weight and height are of great importance for analysis. And although we are all different and each child is individual, there are boundaries of a number of indicators, going beyond which indicates improper development. Using our child's height and weight calculator, as well as the ratio of these indicators - body mass index, you will understand exactly how your baby is developing.

The calculator contains only official data and recommendations, which are adhered to by experts from WHO. The indicators are calculated quite accurately, for example, by setting the age to the nearest day and kilograms with grams, you can get an exact answer to the question of whether the child is developing correctly.

What does the indicator of growth (body length) mean?

One of the most important indicators of a baby's development is its growth. Please note that height is not the same as body length. Its (body length) is measured in very young children up to 2 years old in a prone position. But height is measured while standing.

The growth of a child is the most important indicator of his physical development. Pediatricians recommend measuring it monthly.

During the first half of the year, the baby grows 2.5-3 cm per month, and by the year this figure can already increase by 22-26 cm from the moment of birth.

Note! The difference between body length and height may be about 1 cm, which may affect the assessment result. If a height is entered for a child under two years old, for the accuracy of the calculation, it is automatically converted to length by the calculator and vice versa.

What are the growth estimates according to our calculator:

Index	What corresponds
Very short	There is a very strong delay in growth, may be accompanied by the presence of excess weight. A comprehensive examination by a specialist is recommended to determine the causes and purpose of treatment.
Undersized	Moderate growth retardation, sometimes accompanied by excess weight. A doctor's consultation is recommended.
Below the average	A slight deviation from the norm may be hereditary. There is no threat to health if weight and BMI are normal.
Middle	Growth is normal, like most healthy children.
Above the average	Tall child, but height is within normal limits. There is no threat to health if the height / weight ratio is normal.
Tall	Such growth is a rare phenomenon, it can be hereditary. There is no health threat if the weight / height ratio is normal.
Very tall	Tall growth can be due to endocrine disease or be hereditary. It is recommended to consult a specialist to determine the exact causes.
Height does not match age	You may have made a mistake when entering the indicators - this height cannot correspond to the age of the child. Please check the data you entered and use the calculator again. With correctly entered data, such growth is a deviation from the norm. A comprehensive examination is needed to identify the causes of the abnormal growth of the child.

When receiving estimates "very short" and "short", consultation and examination by specialists is necessary. Usually, such assessments are noted in premature babies, or in the presence of developmental delays.

In turn, too tall ("very high" rating) may also indicate the presence of an endocrine disease. But it can also be hereditary, especially if at least one of the baby's parents is tall. But for complete confidence it is still worth getting advice from a specialist.

What does the child's weight indicator mean?

The weight indicator for a certain age is relevant only in conjunction with the growth indicator - this is the only way to judge the correct development of the child. By itself, indicative weight does not provide an accurate estimate. However, pay attention to the ratings "Low weight" and "Extremely high weight" - after all, there are certain limits of the norm for each age.

What are the weight estimates according to our calculator:

Index	What corresponds
Very severe underweight for the indicated age	There is a possibility that the child is depleted. An urgent examination by a doctor is required.
Low weight, underweight	An examination by a qualified specialist is necessary: \u200b\u200bthere is a possibility that the child is emaciated
Less than average weight	The lower limit of the norm for the specified age .. It may be worth consulting a doctor.
Average weight, within normal limits	The child is of normal weight, which is consistent with age and height.
Over average weight	The weight is more than average, but it is worth analyzing the height and if the BMI is within the normal range, then this weight corresponds to the physique of the child.
Very heavy weight	It may be worthwhile to consult a specialist, since the weight of the child indicates disorders of the endocrine system. The risk of developing obesity is possible.
Weight is not age appropriate	Check the information you entered: there may have been a mistake.If all the data is correct, then most likely the child has problems with the development of height or weight (see estimates of height and BMI). Be sure to consult a specialist.

What does body mass index mean?

You cannot judge a child's development based on height or weight alone. These two indicators are directly related to each other. It happens that a child has a short stature due to short parents, but at the same time a harmonious physique, therefore, he has no problems in development. For an accurate assessment, an analysis of two indicators is required - both height and weight, and their ratio is called the Body Mass Index (BMI), which allows you to assess the possible deviation in weight or height of the child.

BMI norms for each age are different, the more children's indicators differ from adults. Therefore, when calculating on a calculator, it is necessary to indicate all the data - both height, weight, and age of the child.

What are the BMI estimates according to our calculator:

Index	What corresponds
Severe underweight	On the face of a lack of body weight, it is necessary to correct the diet as prescribed by a doctor. It is also worth getting an endocrinologist's advice to exclude a malfunction of the endocrine system.
Underweight	Underweight compared to height. It is necessary to consult an endocrinologist and a nutritionist (most likely, you will have to change your diet).
Reduced weight	The lower limit of the norm. The child has a lower weight than most of his peers.
Height-to-weight ratio within normal limits	Optimal height to weight ratio.
Overweight for a given age	The child has a higher weight compared to his peers. In the future, there is a risk of overweight.
Overweight, obesity 1 degree	The child has problems with being overweight. The entered data correspond to obesity of the 1st degree. It is recommended to consult a nutritionist to correct nutrition. It is also worth consulting an endocrinologist.
Obesity grade 2	Very heavy weight for the indicated age. An urgent need to change the diet and increase the physical activity of the child.
Impossible to assess	BMI readings are much higher than normal. Please check if the entered data is correct. If the height, weight and age of the child are entered correctly, then seek the advice of an experienced professional for the treatment of severe obesity.

What determines the growth and weight norms of the child

Of course, the development of each child is individual, children can be delicious chubby or thin reeds, but nevertheless, the World Health Organization did not in vain come up with and approved some norms of height and weight. Moreover, the ratio of these indicators can tell about the correct and harmonious physical development of the child.

Most often, the parameters of the growth and weight of the baby depend on the following factors:

What kind of feeding was (is) the child - breastfeeding or artificial;
The amount of food consumed at the moment;
Congenital or hereditary diseases (for example, problems with the heart, gastrointestinal tract, thyroid);
Child gender;
Physical activity of the child.

In the first months of life, the little man is actively gaining body weight and increasing his height. These two parameters can increase disproportionately, but if the deviations are insignificant in comparison with the parameters from the WHO, while the child is not worried about anything, he is active and eats well, then there is no need to worry. In addition, we must not forget about heredity, because if at least one of the parents is tall or overweight, then the child has every chance of becoming a "butuz".

But serious deviations from the norms of weight and height should be discussed with a doctor. The reasons can be both temporary difficulties (for example, a cold), and more serious disorders (endocrine diseases, congenital defects).

What are the norms for weight and height according to WHO

The harmonious development of the baby is determined not only by the indicators of height or weight, but most likely by their ratio. So. generally accepted norms for a newborn are weight indicators from 2400 g to 4300 (the first value is the minimum for a girl, the second is the maximum for a boy).

In the first week of life, the baby loses weight by about 7% of its initial weight (adaptation to the external environment occurs), so parents should not worry, as this is a normal physiological process.

In general, in the first 6 months of life, the baby should gain monthly from 650 to 800 g of weight, as there is an active growth and strengthening of the body.

Well, after 6 months and up to a year, the baby gains 350-600 g per month.

How to calculate the norm of weight and height of a child - formula

To calculate the optimal weight for a child from birth to 6 months, use the formula:

m + 800 * N, where m is the weight of the child at the time of birth (kg), N is the number of months during the calculation period.

After six months, the formula for calculating the norm of weight changes:

m + 800 * 6 + 400 * (N-6), where m is the weight of the child at the moment of birth (kg), (800 * 6) is the weight that the child should ideally have acquired in the first six months, N is the number of months after six months.

The percentage of overweight children is increasing at an alarming rate worldwide - on average, one in three teenagers or children are currently overweight or obese.

Now many children spend little time on training and outdoor games, they spend more time in front of the TV, playing video games or a computer. And in many working, busy families, parents have less free time to prepare healthy, homemade meals. From fast food to the computer, fast and in a rush - this is the reality for many families.

Keeping children from being overweight means establishing proper diet and exercise routines in the family, as well as healthy relaxation together. We must include our children in healthy lifestyles through our own example.

Is your child underweight or overweight?

The World Health Organization (WHO), the US Department of Health, as well as most countries in the world successfully use BMI - body mass index - to estimate excess weight in adults and children, which is based on the ratio of height to weight, and then calculate the proportion of fat in the human body. The method for calculating BMI is the development of Adolphe Quetelet and for children it provides a special scheme. First, you need to calculate the child's BMI using the general formula:

Quetelet Body Mass Index (BMI) Calculator

Since children and adolescents are characterized by active growth and development, their BMI can change significantly within a short time. Therefore, the usual BMI assessment common in adults is not suitable for them. To accurately and correctly assess the body mass index of a child, scientists have studied the ratio of weight and height of many thousands of children. And when you need to determine if your child's BMI is normal or deviating from it, comparison charts - "percentage curves" or distribution scales - with averages for children of this age and height will give you the opportunity to understand whether you need to adjust weight. Thus, your child's BMI is compared to the average of thousands of other children. This approach takes into account the developmental stages that children go through in certain age groups. For example, if a child has a body mass index higher than 97% of children of his own age, then it can be concluded that the child is overweight.
This table contains information on the BMI of adolescents and children of both sexes from 2 to 20 years old.

As a result, your child's BMI will fall into one of four categories:

Lack of weight: BMI below 5th average (percentage curve);
Healthy weight: BMI between 5th and 85th average
Overweight: BMI between 85 and 95;
Obesity: BMI is in the 95th or higher region.

For children under 2 years of age, doctors use weight-for-height charts and close-up physical examinations.

Table for assessing the weight and height of a child by BMI

At the same time, BMI is not an ideal indicator of the amount of body fat and can be misleading in some cases. For example, a well-muscled teenager may have a high BMI without being overweight (muscle gains to body weight, not overweight). In addition, BMI can be difficult to assess correctly during puberty, in which young people experience rapid growth. In any case, it is important to remember that BMI is generally a good indicator, but it is not a direct measure of body fat.

Bioimpedance analysis allows you to determine the exact percentage of adipose tissue. With the help of a certain device, a weak, safe electric current is passed through the body, changing its frequency. Different tissues of the body have different resistance to electric current, so it becomes possible to calculate how much of the body is in the muscles, and what is in the bones and fat.

If you are concerned that your child may be overweight or underweight, arrange an appointment with a healthcare provider who will assess nutrition and physical activity and suggest positive changes. Your doctor may also recommend prevention of certain conditions associated with underweight or obesity.

Norms of weight and height of the child by age

Growth and weight table of a child up to a year

Age	Height in cm.					Weight in kg.
	Very low	Low	Middle	Tall	Very tall	Very low	Low	Middle	Tall	Very tall
1 month	49.5 cm.	51.2cm.	54.5cm.	56.5cm.	57.3cm.	3.3 kg.	3.6kg.	4.3kg.	5.1kg.	5.4kg.
2 month	52.6cm.	53.8cm.	57.3cm.	59.4cm.	60.9cm.	3.9 kg.	4.2kg	5.1kg.	6.0kg.	6.4kg.
3 months	55.3cm.	56.5cm.	60.0cm.	62.0cm.	63.8cm.	4.5kg.	4.9kg.	5.8kg.	7.0kg.	7.3kg.
4 months	57.5cm.	58.7cm.	62.0cm.	64.5cm.	66.3cm.	5.1kg.	5.5kg.	6.5kg.	7.6kg.	8.1kg.
5 months	59.9cm.	61.1cm.	64.3cm.	67cm.	68.9cm.	5.6kg.	6.1kg.	7.1kg.	8.3kg.	8.8kg.
6 months	61.7cm.	63cm.	66.1cm.	69cm.	71.2cm.	6.1kg.	6.6kg.	7.6kg.	9.0kg.	9.4kg.
Seven months	63.8cm.	65.1cm.	68cm.	71.1cm.	73.5cm.	6.6kg.	7.1kg.	8.2kg.	9.5kg.	9.9kg.
8 months	65.5cm.	66.8cm.	70cm.	73.1cm.	75.3cm.	7.1kg.	7.5kg.	8.6kg.	10kg.	10.5kg.
9 months	67.3cm.	68.2cm.	71.3cm.	75.1cm.	78.8cm.	7.5kg.	7.9kg.	9.1kg.	10.5kg.	11kg.
10 months	68.8cm.	69.1cm.	73cm.	76.9cm.	78.8cm.	7.9kg.	8.3kg.	9.5kg.	10.9kg.	11.4kg.
11 months	70.1cm.	71.3cm.	74.3cm.	78cm.	80.3cm.	8.2kg.	8.6kg.	9.8kg.	11.2kg.	11.8kg.
	Very low	Low	Middle	Tall	Very tall	Very low	Low	Middle	Tall	Very tall

Child's height and weight table by years

Height in cm.

Weight in kg.

Very low

Low

Middle

Tall

Very tall

Very low

Low

Middle

Tall

Very tall

1 year

71.2cm.

72.3cm.

75.5cm.

79.7cm.

81.7cm.

8.5kg.

8.9kg.

10.0kg.

11.6kg.

12.1kg.

2 years

81.3cm.

83cm.

86.8cm.

90.8cm.

94cm.

10.6kg.

11kg.

12.6kg.

14.2kg.

15.0kg.

3 years

88cm.

90cm.

96cm.

102.0cm.

104.5cm.

12.1kg.

12.8kg.

14.8kg.

16.9kg.

17.7kg.

4 years

93.2cm.

95.5cm.

102cm.

108cm.

110.6cm.

13.4kg.

14.2kg.

16.4kg.

19.4kg.

20.3kg.

5 years

98.9cm.

101,5

108.3cm.

114.5cm.

117cm.

14.8kg.

15.7kg.

18.3kg.

21.7kg.

23.4kg.

6 years

105cm.

107.7cm.

115m

121.1cm.

123.8cm.

16.3kg.

17.5kg.

20.4kg.

24.7kg.

26.7kg.

7 years

111cm.

113.6cm.

121.2cm.

128cm.

130.6cm.

18kg.

19.5kg.

22.9kg.

28kg.

30.8kg.

8 years

116.3cm.

119cm.

126.9cm.

134.5cm.

137cm.

20kg.

21.5kg.

25.5kg.

31.4kg.

35.5kg.

9 years

121.5cm.

124.7cm.

133.4cm.

140.3cm.

143cm.

21.9kg.

23.5kg.

28.1kg.

35.1kg.

39.1kg.

10 years

126.3cm.

129.4cm.

137.8cm.

146.7cm.

149.2cm.

23.9kg.

25.6kg.

31.4kg.

39.7kg.

44.7kg.

11 years

131.3cm.

134.5cm.

143.2cm.

152.9cm.

156.2cm.

26kg.

28kg.

34.9kg.

44.9kg.

51.5kg.

12 years old

136.2cm.

140cm.

149.2cm.

159.5cm.

163.5cm.

28.2kg.

30.7kg.

38.8kg.

50.6kg.

58.7kg.

13 years old

141.8cm.

145.7cm.

154.8cm.

166cm.

170.7cm.

30.9kg.

33.8kg.

43.4kg.

56.8kg.

66.0kg.

14 years old

148.3cm.

152.3cm.

161.2cm.

172cm.

176.7cm.

34.3kg.

38kg.

48.8kg.

63.4kg.

73.2kg.

15 years

154.6cm.

158.6cm.

166.8cm.

177.6cm.

181.6cm.

38.7kg.

43kg.

54.8kg.

70kg.

80.1kg.

Very low

Low

Middle

Tall

Very high

Very low

Low

Middle

Tall

Very high

Preventing excess weight and obesity

The key to keeping children of all ages at a healthy weight is the whole family's lifestyle. This is what is "preached" in the family. Make physical activity and healthy eating a family hobby. To keep children interested in this too, let them help them plan and prepare a healthy menu, take them with you to grocery stores so that they learn to choose healthy and correct foods.
Don't fall into these common dietary traps:

Do not reward children for good behavior, or try to deter them from bad behavior with sweets or treats. Encouragement or punishment should not include food, there are many other effective and correct ways of education.
Do not support the "clean plate" policy... Watch for signs that your child is hungry. Even babies who turn away from the bottle or breast report that they are full. If the children are full, do not force them to continue eating. Remind yourself that we should only eat when we are hungry.
Do not talk about "harmful products" and do not completely exclude all sweets and favorite delicacies from the children's menu. Children are more likely to rebel and eat large quantities of these unhealthy foods outside the home or when their parents cannot see.

conclusions

It is not easy to motivate a child for the result, he cannot be "put" on a diet. In turn, adolescence is difficult because there is a danger of self-rejection, isolation, depression, anorexia. After you figure out if your child needs weight correction, we would like to provide some additional recommendations for children of all ages:

From birth to 1 year: Besides the well-known multifaceted health benefits, breastfeeding can help prevent excessive weight gain as well. Although the exact mechanism has not yet been established, breastfed babies are more aware of their hunger and satiety, thus protecting themselves from overeating.
1 to 5 years: it is better to develop good habits from an early age. Help your child establish healthy eating habits by offering a variety of healthy foods. Encourage the child's natural propensity to be active and help him develop.
6-12 years old: Keep your child physically active every day. Let it be a sports section or outdoor games in the yard. Encourage activity at home as well - in your daily homework and in playing and walking on weekends. Teach your child to choose wholesome and healthy foods, help him collect his own sandwiches for school.
13-18 years old: Teens often lean towards fast food, but try to push them towards healthier foods. For example, with baked chicken sandwiches, salads and smaller portions. Teach them how to make delicious healthy meals and treats at home. Help them maintain physical activity every day.
All ages: Reduce the time your child spends in front of the TV, computer, and video games. Challenge your child's eating habits by watching TV or a computer monitor. Try to cook and serve a variety of healthy foods to your child. Try to have breakfast, lunch and dinner with your child. Encourage children to eat vegetables and fruits at least five times a day, limit sugary drinks, and never skip breakfast.

If you eat right, exercise often, and incorporate healthy habits into your family's daily routine, you are building a healthy lifestyle for your children that they can continue to support. Explain to them the importance of physical activity and proper nutrition, but make sure to make it a common family habit so that it becomes second nature to each of you.

But above all, let your children know that you love them, regardless of their weight, and your main desire is to help them be happy and healthy.

The analysis is carried out according to the tables of height, weight and BMI developed by the World Health Organization (WHO) as a result of research on the development of healthy children of different nationalities and geographic areas. All value ranges, procedures and recommendations are given in accordance with WHO materials.

The calculator takes into account the individual physical indicators of the child in the complex (weight, height, age and BMI) and gives a more complete estimate of the weight in comparison with the simplified age standards. The program allows you to assess whether a given child is developing normally, to identify growth problems or trends that indicate a risk of a problem. In case of significant deviations, a recommendation will be written to contact specialists.

We ask you to pay close attention to the entered values \u200b\u200bas the calculator shows the result based on these data. Measurements must be accurate, large errors are not allowed.

Growth

Growth must be monitored monthly, and the technique for measuring it changes depending on the child's age.

For children under 2 years of age, the length of the body is measured while lying down.

In children over 2 years of age, height is measured while standing.

It is important not to confuse the length and height readings. Our calculator converts one indicator to another, using the WHO formula: from height, you can get body length by adding 0.7 cm, from body length, by subtracting 0.7 cm.

Gradation of results - from extremely short to very tall.

Stunted growthcan be both a consequence of prematurity and disease, developmental delay and may be accompanied by excess weight.

High growth occurs infrequently and, as a rule, is due to heredity. If the child's parents are of average height, seek the advice of a specialist, as exceeding the norm may be a consequence of endocrine disease.

Weight

When measuring, it is necessary to remove the outer clothing from the child. Wet diapers, clothes and jeans can weigh over 0.5 kg. Babies are weighed naked (before weighing, the baby should be wrapped in a blanket so that he does not freeze). Older children take off everything except their underwear.

There are weight standards for each age, but the assessment is not always correct due to the fact that the child's height is not taken into account, which may be higher or lower than the norm. Use a body mass index (BMI) analysis for an adequate assessment.

Gradation of results - from extremely low to very high weight.

Body mass index (BMI)

BMI gives a more adequate comprehensive assessment, shows how harmonious the height and weight of the child is, shows their ratio.

This indicator allows you to objectively assess the situation and see if the child has problems with weight.

BMI is calculated as follows: Weight in kg ÷ square of height / length in meters (measured in kg / m²).

BMI norms depend on the child's age and differ significantly from those for adults, which is taken into account in our calculator. Gradation of results - from extreme emaciation to obesity.

With a lack of body weight it is necessary to consult a specialist and adjust the diet.

Increased body mass indexoften due to heredity: if one of the parents is diagnosed with obesity, the child has a 40% chance of gaining excess weight. If obesity is diagnosed in both parents, then this probability increases to 70%.

According to the WHO, the main cause of obesity and overweight is energy imbalance, that is, the caloric content of the diet that exceeds the body's needs. The problem is exacerbated by an increase in the consumption of high-calorie and fatty foods, as well as a decrease in physical activity (including due to a long stay in a sitting position).

An elevated BMI increases the risk of many non-communicable diseases, from cardiovascular and musculoskeletal disorders to some cancers. Obese children experience shortness of breath and are at increased risk of fractures. Often they have psychological problems and complexes.

Overweight and obesity can often be prevented by eating a healthy diet and increasing physical activity. The same measures serve to prevent such violations.

Anyone who is overweight can improve their health by:

restricting calorie intake by reducing the intake of sugars and fats;
increasing consumption of whole grains and pulses, nuts, fruits and vegetables;
regular physical activity - 1 hour a day (7 hours a week) for children and at least 2.5 hours a week for adults).

We hope that our calculator will help you keep track of your weight and respond in time to any deviations from the norm. We recommend that you contact only experienced specialists who will provide qualified assistance, identify the cause of the violation and help eliminate it.

For most parents, the main indicator of a child's health is a good appetite, while they are also afraid of both the appearance of extra pounds and their lack. However, it is not at all easy to independently calculate how much the body weight of a son or daughter corresponds to height and age, because before the age of 18, “adult” methods of such measurements are not suitable for them. That is why it is necessary to have at hand a special online calculator of the child's weight, which is presented on our website. With the help of this service, you can easily and simply get accessible information about the development of your children by marking the necessary parameters in the appropriate fields.

Child's height and weight calculator

Select the gender and age of the child to find out what the parameters of your child should be according to the WHO (World Health Organization) standards

Low kg

Average kg

High kg

Low cm

Medium cm

High cm

How does it work

This calculator plays a very important role in helping parents assess the condition of their child, get rid of doubts, find out the need to adjust the children's diet in one direction or another, and at the same time avoid weight jumps. The main parameters that are required to calculate the rate are:

dependence on sex and age;
ratio of weight and height.

The method of using the online calculator is as follows:

Mark the gender and select the age of the child, click "Calculate".
Measure his height and weigh. Measurements and weighing should be performed in the morning, on an empty stomach, after using the toilet, barefoot, in light underwear.
Compare the received data with the parameters of the calculator.

The norms issued in the calculation results are established by the World Health Organization separately for boys and girls. Our website uses the most up-to-date data that can be used to interpret the height and weight indicators of children under the age of 17 inclusive.

To set new standards for child development, UNICEF, WHO and a number of UN organizations have undertaken a large-scale project, during which 9,000 boys and girls were examined. All of them were brought up in a supportive environment with a healthy lifestyle and the right diet. The resulting data resulted in graphs of parameters from toddlers to adolescents. These graphs reflect not only absolute indicators, but also the relationship between height and weight. It is this ratio that gives the most complete idea of \u200b\u200bhow harmonious development is for a particular child or for a teenager. Based on this technique, our calculator has been compiled.

Interpreting Results

As a result of the calculation on the calculator, indicators of height and weight are given - low, medium and high. Each of them is interpreted accordingly.

Height (length)

In babies under 3 years of age, body length is measured, after 3 years of age - growth in a standing position. The difference between these parameters can be about 1 cm, which will affect the results of the assessment. Therefore, for the accuracy of calculating young children, it is recommended to measure it at a pediatrician, since this indicator is one of the most important.

Possible estimates of height (length) according to the calculator:

Very low - much lower than the norm, which indicates a significant developmental lag, often accompanied by extra pounds. A doctor's examination is recommended to identify the cause and treatment.
Low - slight lag, can also lead to excess kilograms. Consultation with a specialist is desirable.
Below average - not high, but within normal limits.
Medium is determined in many healthy boys and girls.
Above average - within normal limits.
High - rare and usually hereditary, without indicating any abnormality.
Very high - it may be normal if the parents also differ in the same parameters, or a sign of endocrine disorders. It is recommended to consult a doctor.

By itself, the weight indicator does not allow a full assessment of the development of the child. But if, according to the results of the calculator, body weight is determined as very low or extremely large, then this is the reason for contacting a doctor.

Possible estimates for the calculator:

Very low - there is a great danger of depletion of the body. An immediate examination by a specialist is required.
Low - there is also a likelihood of exhaustion, consultation with a doctor is necessary.
Below average - the lower limit of the norm, the diet should be revised.
Medium is ideal for many healthy girls and boys.
More than average - with this indicator, an assessment should be carried out taking into account BMI.
Very large - also estimated based on body mass index.

Body mass index

The harmony of a child's development does not depend on age, but is determined by the body mass index (BMI), which is calculated as the ratio of height and weight. So, the ideal weight for a 13-year-old girl of average height (151.8 cm) will be 43 kg, and for a 14-year-old low (147.8 cm) - 37.6 kg. In adolescent boys, this difference is less pronounced, since during this period they develop less intensively. For example, a short (136.2 cm) teenager 12 years old should weigh 28.2 kg, while an 11 year old boy of average (138.5 cm) height is 31 kg.

Body mass index is individual for each person. It can be calculated on our website. It should also be borne in mind that there are reasons that affect the decrease or increase in kilograms. Almost all of them can be adjusted to reach the optimal body weight.

Weight factors

Almost all deviations from the norm, determined when calculating on an online calculator, should not be a reason for panic. The main parameters for losing weight or gaining pounds depend on a number of different factors that must be taken into account:

Genetic predisposition. For large parents, the offspring will also have deviations in the same parameters upward. And thin, short parents very rarely grow up a daughter or a son with overweight.
Health status. Here, both diseases that directly affect weight (for example, endocrine) and common diseases that worsen the well-being of the baby play a role, which leads to loss of appetite.
Appetite. Everyone has a different attitude to food and a different appetite. If the weight does not deviate much from the norm, you should not force or limit the diet, but the diet should be healthy - without fast food, chips, soda and other junk food.
Lifestyle. This is the most common reason for gaining excess pounds. Today's children spend little time on the street, playing sports or playing active games. Parents should limit the time they spend at the computer and organize the daily routine correctly.

By providing the correct regimen, active pastime, eating healthy and tasty food, you can completely avoid the appearance of extra pounds in your son or daughter or a lack of them due to lack of appetite. And using an online calculator will help you easily follow their harmonious development.