The online BMI calculator will help you determine your body mass index and understand whether your weight is normal
Body mass index (BMI) is an indicator that helps assess the proportions of a person's weight to their height. Our online BMI calculator allows you to quickly and accurately determine your body mass index and understand whether your weight is within the normal range.
The BMI calculator is suitable for people of any age and gender. It helps assess weight for height and identify possible health risks associated with being overweight or underweight.
Let's look at practical examples of calculating body mass index for different cases:
Male, height 175 cm, weight 70 kg
IMT = 70 / (1.75)² = 70 / 3.0625 = 22.86BMI = 22.86 (normal weight)
Category: Normal (18.5-24.9)
Woman, height 165 cm, weight 48 kg
IMT = 48 / (1.65)² = 48 / 2.7225 = 17.63BMI = 17.63 (underweight)
Category: Underweight (<18.5)
Male, height 180 cm, weight 90 kg
IMT = 90 / (1.80)² = 90 / 3.24 = 27.78BMI = 27.78 (overweight)
Category: Overweight (25-29.9)
Woman, height 160 cm, weight 85 kg
IMT = 85 / (1.60)² = 85 / 2.56 = 33.20IMT = 33.20 (obesity I degrees)
Category: Obesity I degree (30-34.9)
Male, height 170 cm, weight 110 kg
IMT = 110 / (1.70)² = 110 / 2.89 = 38.06IMT = 38.06 (2 degree obesity)
Category: Obesity II degree (35-39.9)
Woman, height 155 cm, weight 95 kg
IMT = 95 / (1.55)² = 95 / 2.4025 = 39.54BMI = 39.54 (III degree obesity)
Category: Obesity III degree (≥40)
BMI is calculated using a simple formula that takes into account your height and weight:
ИМТ = Вес (кг) / Рост² (м²)The World Health Organization (WHO) has defined the following BMI categories:
BMI is an important indicator for assessing health risks:
It is important to understand the limitations of BMI as an indicator:
Our free online BMI calculator will help you quickly determine your body mass index. Just enter your height and weight and get accurate results with health recommendations.
Body mass index (BMI or BMI) is an indicator that is calculated by the formula: weight in kilograms divided by the square of height in meters. Formula: BMI = weight (kg) / height² (m²). For example, with a weight of 70 kg and a height of 175 cm: BMI = 70 / (1.75)² = 22.9.
The normal body mass index for women is 18.5-24.9 kg/m². This is the range that corresponds to the lowest health risks. Values below 18.5 indicate underweight, and values above 25 indicate overweight.
The normal body mass index for men is also 18.5-24.9 kg/m². This range is optimal for health regardless of gender. A BMI above 25 indicates overweight, and above 30 indicates obesity.
To calculate your BMI online, enter your height in centimeters and weight in kilograms into the BMI calculator. The system will automatically calculate your body mass index using the formula and show your weight category: normal, underweight, overweight or obese.
Underweight is defined as a BMI below 18.5 kg/m². This may indicate malnutrition, health problems or constitutional issues. It is recommended to consult a doctor to assess your health status.
Overweight is defined as a BMI of 25-29.9 kg/m². This indicates being above the normal weight range and may increase the risk of cardiovascular disease. It is recommended to review your diet and increase physical activity.
Obesity is diagnosed with a BMI of 30 kg/m² or higher. There are three degrees of obesity: I degree (30-34.9), II degree (35-39.9) and III degree (≥40). Each degree requires medical supervision and supervision.
The ideal weight for a normal BMI is calculated using the formula: weight = BMI × height². For a normal range of 18.5-24.9, with a height of 170 cm, the ideal weight is from 53.5 to 72 kg. For example, for a BMI of 22: weight = 22 × (1.70)² = 63.6 kg.
Although BMI does not directly take into account age, normal values may vary among different age groups. For children and adolescents, special percentile charts are used, but for older adults, the acceptable range may be slightly higher.
For athletes, BMI can be an inaccurate indicator because it does not take muscle mass into account. In professional athletes with developed muscles, BMI may be overestimated, although the percentage of body fat is low. In such cases, it is better to use other methods for assessing body composition.
The normal weight range is calculated for a BMI of 18.5-24.9. Minimum normal weight = 18.5 × height², maximum = 24.9 × height². For example, with a height of 175 cm: minimum = 18.5 × (1.75)² = 56.7 kg, maximum = 24.9 × (1.75)² = 76.3 kg.
BMI (Body Mass Index) and BMI (Body Mass Index) are the same thing. BMI is an English abbreviation, and BMI is Russian. Both denote an indicator calculated by dividing weight by the square of height.
A high BMI (≥25) increases the risk of heart disease, type 2 diabetes, hypertension, joint disease, some cancers, and breathing problems. With a BMI ≥30, the risks increase significantly and require medical intervention.
A low BMI (<18.5) may indicate malnutrition, weakened immunity, osteoporosis, fertility problems, increased risk of infections and slower recovery from illness. Consultation with a physician is recommended.
It is recommended to check your BMI regularly, for example, once a month when actively working on weight, or once a quarter for general control. To track your weight changes, use our online BMI calculator.
A standard BMI calculator is not suitable for children, as normal values change with age. For children, special percentile growth charts are used taking into account gender and age. Contact your pediatrician for an assessment of your child's weight.
During pregnancy, BMI may not be accurate due to changes in the body. Pre-pregnancy body mass index and pregnancy weight gain are usually assessed. The rate of weight gain depends on the initial BMI: with a normal BMI - 11.5-16 kg.
BMI does not take into account muscle mass, body fat distribution, age, gender and constitution. In athletes, older adults, and pregnant women, the reading may be less accurate. For a more accurate estimate, use additional methods.
BMI <18.5 – underweight, 18.5-24.9 – normal, 25-29.9 – overweight, 30-34.9 – class I obesity, 35-39.9 – class II obesity, ≥40 – class III obesity. The results are indicative; a doctor’s consultation is required to fully assess your health.
To reduce BMI to a normal value (18.5-24.9), it is necessary to create a calorie deficit: eat right, increase physical activity, and lead a healthy lifestyle. It is recommended to lose weight gradually - 0.5-1 kg per week. Consulting a nutritionist will help you create a plan.
To increase BMI if you are underweight (<18.5), you need to increase your caloric intake, include more proteins and carbohydrates, eat regularly, and increase muscle mass through strength training. Consulting a doctor will help rule out medical causes of low weight.
BMI evaluates overall body weight relative to height, while the waist-height index (WHI) takes into account fat distribution—the ratio of waist circumference to height. The TRI better reflects abdominal obesity and the risk of metabolic diseases. Both indicators complement each other.
Yes, our online BMI calculator uses the standard WHO formula for calculating BMI and gives accurate results. However, remember that BMI is a guideline and does not replace consultation with a doctor for a complete assessment of your health.
For teenagers, special percentile charts are used taking into account gender and age. Normal values change as you grow. Typically, a BMI in the range of 13-85 percentile is considered normal, but a pediatrician will give an accurate estimate using age tables.
To calculate BMI in pounds and inches, use the formula: BMI = (weight in pounds × 703) / (height in inches)². For example, if you weigh 150 pounds and are 70 inches tall: BMI = (150 × 703) / (70)² = 21.5. Our calculator supports the metric system (kg and cm).
Research shows that a BMI in the range of 20-25 is associated with the longest life expectancy. BMI <18.5 and >30 increase the risk of premature death. Maintaining a normal BMI through healthy eating and activity promotes longevity.
To calculate your target weight when losing weight, determine your desired BMI (usually 22-23) and calculate your target weight: weight = BMI × height². The difference between your current and target weight is the number of kilograms to lose. Reduce weight gradually - 0.5-1 kg per week.
For older people (over 65 years old), the acceptable BMI range may be slightly higher - 23-28. Being slightly overweight may be a protective factor. However, exact recommendations depend on individual health and should be discussed with your doctor.
BMI is one of the risk factors for type 2 diabetes. A BMI ≥25 increases the risk of diabetes, and a BMI ≥30 increases the risk significantly. However, heredity, lifestyle and other factors are also important for a full assessment. Use BMI as a guide.
A BMI ≥25, especially in combination with high blood pressure, high blood sugar and lipid disorders, may indicate metabolic syndrome. This condition increases the risk of cardiovascular disease. Normalizing your BMI through diet and physical activity helps improve your metabolism.