Калькулятор ИМТ (Индекс массы тела)

BMI calculator

Accurate calculation of body mass index

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Your BMI
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1618.5253040
Medical advice:
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Узнайте, находится ли ваш вес в пределах медицинской нормы. Наш калькулятор использует 3 параметра (Рост, Вес и Возраст), чтобы выдать максимально точный результат с учетом возрастных сдвигов метаболизма.

↑ Введите данные в форму выше ↑

Что такое ИМТ и зачем он нужен?

Индекс массы тела (Body Mass Index) — это золотой стандарт Всемирной организации здравоохранения для первичной диагностики степени ожирения или истощения. Он позволяет быстро оценить, есть ли угроза здоровью из-за нарушения пропорций тела.

Зачем указывать возраст?

Стандартная формула ИМТ не учитывает возрастные изменения плотности костей и мышечной массы. После 30 лет нормальный процент жировой ткани физиологически увеличивается. Вводя возраст, вы получаете скорректированный результат (по таблицам геронтологии).

📐 How does Quetelet's formula work?

The calculator does everything automatically, but if you want to check the calculations manually, use the classic formula of the Belgian statistician Adolphe Quetelet:

BMI = Weight (kg) / Height² (m)

Example: Your weight 70 kg, height 1.75 m.
We count: 1.75 × 1.75 = 3.06.
Divide: 70 / 3.06 = 22.8 (Normal).

📊 Table of BMI norms by age

The WHO standard (18.5–25) is ideal for young people. However, over the years, metabolism slows down, and a small increase in weight is considered acceptable and even beneficial.

Age Ideal BMI
19 - 24 19 - 24
25 - 34 20 - 25
35 - 44 21 - 26
45 - 54 22 - 27
55 - 64 23 - 28
65+ 24 - 29

If you are over 60 and your BMI is 26, you don’t need to go on a diet - this is your biological norm.


⚠️ Who is this calculator NOT suitable for?

Quetelet's formula evaluates only total body mass, but not its composition. Therefore, the results may be false for two groups:

🏋️ Athletes

Muscle is heavier than fat. A bodybuilder who is 180 cm tall and weighs 100 kg will be diagnosed as Obese (BMI 30+), although he has no fat. They need to calculate body fat percentage (BFP).

🧍 Skinny Fat

People with normal weight, but weak muscles and tummy. BMI will show “Normal”, although there is a health risk. Here it is better to focus on waist size.


Frequently asked questions (FAQ)

🔹 What is “New BMI”?

This is a refined Oxford formula (1.3 × Weight / Height^2.5). It is more fair for very tall or very short people. However, medical practice is still dominated by the WHO standard that we use.

🔹 What BMI is needed for a deferment from the army?

In Russia, a deferment (category “G”) is given if the BMI is below 18.5 (malnutrition) or above 35.0 (obesity 3-4 degrees). Complete exemption (category “D”) is possible for grade 4 obesity.

🔹 How to calculate the time to lose weight?

Knowing your current BMI and desired weight, you can plan a diet. Remember that safe weight loss is about 0.5-1% of body weight per week.

🏥 Medical disclaimer: Calculation results are for informational purposes only. To make a diagnosis and prescribe a diet, be sure to consult your doctor.

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