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High Body Mass Index values (overweight or obese) are associated with an increased risk of various health conditions, including heart disease, diabetes, certain cancers, and joint problems. However, it is essential to consult with a healthcare professional for a comprehensive assessment of health risks.


It is worth noting that BMI is just one indicator among many that can be used to assess health. For a more accurate evaluation, it is advisable to consult with a healthcare professional who can consider other factors and perform a thorough assessment. But how do we know whether we fall in the healthy weight range? Your BMI solves this confusion. It connects your weight with your height and assesses whether it suits your stature. 

What is BMI Calculator?

The Body Mass Index or BMI is a measure of how much body mass you have in relation to your height and weight. A Body Mass Index Calculator or BMI calculator is an online or offline technique which calculates your body mass index.      


Body mass refers not only to the fat within your body but also within muscles and bones. It is calculated by measuring your weight and dividing it by the square of your height. The BMI figures let you know whether you are within normal weight range, or if you are underweight or overweight.

Both high BMIs and low ones are known to raise a lot of health problems, especially as you age.

Body Mass Index or BMI is widely used in medical and health fields as a screening tool to determine if an individual is underweight, normal weight, overweight, or obese.


To calculate Body Mass Index or BMI, the weight of a person in kilograms is divided by the square of their height in meters. 


The formula is as follows:

BMI = weight (kg) / (height (m2)


The resulting value from the calculation is then interpreted using standard BMI categories:

  1. Underweight: BMI less than 18.5
  2. Normal weight: BMI between 18.5 and 24.9
  3. Overweight: BMI between 25 and 29.9
  4. Obese: BMI 30 or higher


It is important to note that while Body Mass Index or BMI can provide a general indication of a person's weight status, it does not take into account other factors such as muscle mass, body composition, or distribution of fat. Therefore, it may not be a comprehensive measure of an individual's overall health. It is always recommended to consult with a healthcare professional for a more accurate assessment and interpretation of one's body weight and health.

How to Calculate Your BMI Online?

Calculating Body Mass Index (BMI) is not a complicated process. This can be done either manually or Online with the help of the BMI formula or using your regular calculator or by using effective tools available online on various websites and apps. When calculating your or someone’s BMI using the body mass index calculator, you need to follow the following steps:


  1. Step 1: Use a weighing scale to check your weight. Note down the pound value to the nearest digit or you can convert it into kilograms (Kgs). Enter this value in the BMI calculator. 
  2. Step 2: Then, measure your length from the wall in feet and inches or just in inches. Enter this value in the BMI calculator. Select your gender and click on calculate BMI. 


This tool will display your results based on the value you entered. If the results indicate that your BMI is above or below the normal range, it is advisable to have a medical check-up. This way, you can avoid the troubles related to your weight.

BMI Calculation Formula

Body Mass Index or BMI is calculated by dividing your weight in kilograms by the square of your height in metres. 


The BMI formula is very simple:

  1. BMI = Weight (in kilograms) / Height (in meter)2


Let’s understand the same with the help of an example:

  1. For instance, if you weigh 75 kg and your height is 1.8 m, you would calculate your BMI as follows:

            BMI = 75/(1.8 x 1.8) = 23.15 


To know your BMI, you must first find your weight and height. Once you are aware of these values, you can arrive at the result by following the two steps mentioned below:


  1.  Multiply your height by itself (height X height).
  2.  Divide your weight by the answer you get in the first step.


However, the best way to find your BMI is by using a body mass index calculator. Although not an accurate measurement of body fat percentage, in most cases, the body mass index  calculator is a reliable and safe tool for specifying risk levels for illnesses, particularly ailments related to excess body fat. It is essential to be aware of your BMI to ensure your overall wellness, hence a regular BMI check should be conducted by the individual on regular basis with the help of the BMI calculator.

Ideal BMI for Male - BMI Chart for men 

It is important to note that BMI is a general guideline and does not take into account individual variations in body composition or other factors such as muscle mass.


For adult males, the World Health Organization (WHO) provides the following BMI classification:

  1. Underweight: BMI less than 18.5
  2. Normal weight: BMI between 18.5 and 24.9
  3. Overweight: BMI between 25 and 29.9
  4. Obesity (Class I): BMI between 30 and 34.9
  5. Obesity (Class II): BMI between 35 and 39.9
  6. Obesity (Class III): BMI 40 or higher


It is important to remember that BMI is just one tool among many to assess overall health. Other factors such as waist circumference, body composition, and individual health considerations should also be taken into account. It is always a good idea to consult with a healthcare professional after the BMI check with the help of the BMI calculator for men to undergo a  comprehensive evaluation of your health and body weight.

Ideal BMI For female - BMI Chart for women 

The concept of an ideal BMI for females is primarily used as a general guideline to assess whether an individual's weight is within a healthy range for their height. The usefulness of BMI check and the Body mass index calculator for females lies in providing a basic assessment of potential health risks associated with being underweight, overweight, or obese. 


For adult females, the World Health Organization (WHO) provides the following BMI classification:


  1. Underweight: BMI less than 18.5
  2. Normal weight: BMI between 18.5 and 24.9
  3. Overweight: BMI between 25 and 29.9
  4. Obesity (Class I): BMI between 30 and 34.9
  5. Obesity (Class II): BMI between 35 and 39.9
  6. Obesity (Class III): BMI 40 or higher


For individuals looking to manage their weight, BMI can serve as a starting point for setting goals. It can help people understand where they fall on the weight spectrum and whether they need to gain or lose weight for their health. Consulting with a healthcare provider or a registered dietitian is essential for making personalized and informed decisions about weight and health.

Ideal BMI for children - BMI Chart for children and Teens


The Body Mass Index (BMI) is a measure of body fat based on an individual's weight and height. However, for children and teens, the interpretation of BMI is different from that of adults because their bodies are still developing. The BMI of children and teens is compared to growth charts that take into account their age and sex. These charts provide percentiles that indicate how a child's BMI compares to others of the same age and sex.


Here is a general guideline for interpreting BMI percentiles for children and teens:

  1. Underweight: Less than the 5th percentile
  2. Normal weight: 5th to less than the 85th percentile
  3. Overweight: 85th to less than the 95th percentile
  4. Obese: Equal to or greater than the 95th percentile


It is important to note that BMI is just one tool used to assess a child's growth and development. Other factors, such as muscle mass and body composition, may influence the interpretation of BMI. Therefore, it is always best to consult with a healthcare professional who can evaluate the child's overall health and provide personalized advice. Also the BMI charts and percentiles can vary slightly depending on the country or organization that provides the reference data. Therefore, it is advisable to refer to growth charts specific to your region or consult with a healthcare professional for the most accurate assessment.

BMI Table

A BMI table is a chart that provides a quick reference to categorize an individual's weight status based on their BMI score, which is calculated using their weight and height. BMI is a numerical value that helps assess whether a person's weight is within a healthy range for their height.

Here is a simplified BMI table for adults:




Less than 18.5


18.5 - 24.9

Normal Weight

25 - 29.9


30.0 or greater



Please note that this table is for adults and not applicable to children and teens. As mentioned earlier, BMI interpretation for children and teens involves comparing their BMI to growth charts specific to their age and sex. The percentile ranges for underweight, normal weight, overweight, and obesity differ for children and teens. It is less important to use growth charts specific to the population and region to accurately assess BMI in children and teens. For a comprehensive assessment of your health and personalized advice, it is best to consult with a healthcare professional who can consider multiple factors beyond BMI alone.


What are the health risks related to being overweight? 

Being overweight or obese is associated with several health risks and conditions. Here are some common health risks related to excess weight:


  1. Cardiovascular diseases: Excess weight can increase the risk of developing various cardiovascular conditions, including high blood pressure (hypertension), heart disease, heart attack, stroke, and abnormal cholesterol levels. These conditions can have serious implications for heart health and overall cardiovascular well-being.
  1. Type 2 diabetes: Obesity is a significant risk factor for developing type 2 diabetes. Excess weight can lead to insulin resistance, a condition in which the body becomes less responsive to the effects of insulin, resulting in elevated blood sugar levels.
  1. Certain cancers: Obesity is associated with an increased risk of developing certain types of cancers, including breast, colon, endometrial, kidney, pancreatic, and liver cancers. The exact mechanisms linking obesity to cancer risk are complex and not fully understood, but it's believed that hormonal changes, chronic inflammation, and insulin resistance play a role.
  1. Sleep apnea: Excessive weight can contribute to the development of sleep apnea, a sleep disorder characterized by pauses in breathing or shallow breathing during sleep. Sleep apnea can lead to poor sleep quality, daytime fatigue, and an increased risk of other health issues such as hypertension and heart disease.
  2. Joint problems: Excess weight puts additional stress on the joints, particularly in the knees and hips. This can lead to conditions such as osteoarthritis, a degenerative joint disease that causes pain, stiffness, and reduced mobility.
  1. Mental health issues: Obesity can have psychological and emotional implications, leading to a higher risk of mental health disorders such as depression, anxiety, low self-esteem, and body image issues.
  1. Respiratory problems: Obesity is associated with an increased risk of respiratory problems, including asthma, shortness of breath, and decreased lung function.
  2. Fatty liver disease: Excess weight can contribute to the accumulation of fat in the liver, leading to non-alcoholic fatty liver disease (NAFLD). NAFLD can progress to more severe conditions such as non-alcoholic steatohepatitis (NASH) and liver cirrhosis.


It is important to note that these health risks are not exclusive to overweight individuals, as factors such as genetics, lifestyle, and overall health also play a role. However, maintaining a healthy weight through a balanced diet, regular physical activity, and lifestyle modifications can help reduce the risk of these health conditions and promote overall well-being.

What are the risks of being underweight? 

Being underweight can also cause various health risks and complications. Here are some potential risks associated with being underweight:


  1. Nutrient deficiencies: Insufficient body weight may indicate inadequate nutrient intake, leading to deficiencies in essential vitamins, minerals, and macronutrients. This can impair the body's ability to function properly and weaken the immune system, making individuals more susceptible to infections and illnesses.
  1. Weakened immune system: Underweight individuals may have a weakened immune system, making them more prone to infections and experiencing longer recovery times.
  2. Malnutrition: Chronic undernutrition can lead to malnutrition, which can result in a range of health problems such as fatigue, muscle weakness, poor wound healing, and impaired cognitive function.
  1. Decreased muscle mass: Inadequate calorie intake and low body weight can cause a loss of muscle mass and strength. This can lead to decreased physical performance, difficulty performing daily activities, and increased risk of injuries.
  2. Hormonal imbalances: Insufficient body weight can disrupt hormonal balance, affecting the menstrual cycle in females and potentially leading to reproductive health issues, such as irregular periods or amenorrhea (absence of menstruation).
  3. Osteoporosis: Inadequate weight-bearing activity and low body weight can contribute to reduced bone density and an increased risk of osteoporosis, a condition characterized by weakened and brittle bones, making individuals more susceptible to fractures.
  1. Impaired growth and development: In children and adolescents, being underweight can hinder proper growth and development. It can affect bone development, height, and overall physical and cognitive development.
  2. Fertility issues: In both males and females, being underweight can affect fertility and reproductive health. It can lead to hormonal imbalances, irregular menstrual cycles, and reduced sperm production.
  1. Mental health concerns: Underweight individuals may be at higher risk of mental health issues such as depression, anxiety, and body image disorders. Social isolation and negative self-perception can also be prevalent.


If you or someone you know is underweight, it is essential to seek medical advice to identify the underlying causes and develop a plan to achieve a healthy weight. A healthcare professional can provide guidance on proper nutrition, lifestyle adjustments, and any necessary medical interventions to address the health risks associated with being underweight.


How to Lower Your BMI?

Lowering your BMI involves achieving a healthier weight through a combination of balanced eating, regular physical activity, and adopting a sustainable lifestyle. Here are some strategies that can help in lowering your BMI:


  1. Eat a balanced diet: Focus on consuming a variety of nutrient-dense foods, including fruits, vegetables, whole grains, lean proteins, and healthy fats. Avoid or limit processed foods, sugary beverages, and foods high in saturated and trans fats. Portion control is also important to ensure you are consuming an appropriate amount of calories for your needs.
  1. Monitor calorie intake: To lower your BMI, it is important to create a calorie deficit by consuming fewer calories than you expend. However, it is crucial to do this in a healthy and sustainable way. Consult with a registered dietitian or healthcare professional to determine an appropriate calorie range for your goals and individual needs.
  2. Engage in regular physical activity: Regular exercise is crucial for weight management and overall health. Aim for at least 150 minutes of moderate-intensity aerobic activity or 75 minutes of vigorous-intense activity each week, along with strength training exercises. Find activities you enjoy, such as brisk walking, jogging, cycling, swimming, or group fitness classes, and make them a regular part of your routine.
  3. Make sustainable lifestyle changes: Focus on long-term lifestyle adjustments rather than short-term, restrictive diets. Aim for gradual, sustainable weight loss rather than rapid and drastic changes. This approach is more likely to lead to lasting results and is better for your overall well-being.
  1. Seek support: Consider seeking guidance from healthcare professionals, such as registered dietitians or personal trainers, who can provide personalized advice and support. They can help you develop a tailored plan based on your individual needs, goals, and any underlying health conditions.
  2. Track progress: Keep track of your progress to stay motivated and accountable. This can involve regular weigh-ins, measuring body circumferences, or using other tools to monitor changes in body composition. However, it's important to focus on overall health improvements rather than solely relying on the number on the scale.
  3. Prioritize sleep and stress management: Adequate sleep and effective stress management are essential for maintaining a healthy weight. Aim for 7-9 hours of quality sleep each night and find stress-reducing activities that work for you, such as meditation, yoga, or engaging in hobbies you enjoy.
  4. Weight loss surgeries: The weight loss surgery can help lower BMI by reducing the size of the stomach or bypassing part of the digestive system.


It is always advisable to consult with a healthcare professional or registered dietitian for personalized advice based on your specific circumstances. They can provide guidance tailored to your individual needs and help you develop a plan that is safe, effective, and sustainable for lowering your BMI. 

Which Weight Loss Surgeries Are Best For A Person With A Higher BMI?

Weight loss surgeries, also known as bariatric surgeries, are typically recommended for individuals with a higher BMI (usually a BMI of 40 or higher, or a BMI of 35-39.9 with obesity-related health conditions). 


The most commonly performed weight loss surgeries include:

  1. Gastric bypass surgery (Roux-en-Y gastric bypass): This procedure involves creating a small pouch from the stomach and connecting it directly to the small intestine, bypassing a portion of the stomach and the first part of the small intestine. Gastric bypass surgery reduces the amount of food you can eat and decreases the absorption of nutrients, leading to weight loss.
  1. Sleeve gastrectomy: In this procedure, a large portion of the stomach is surgically removed, leaving a smaller, banana-shaped sleeve stomach. The reduced stomach size limits the amount of food you can eat, resulting in weight loss.
  1. Adjustable gastric banding: This procedure involves placing an inflatable band around the upper part of the stomach, creating a small pouch. The band can be adjusted to control the amount of food that can pass through the stomach. Gastric banding restricts food intake and promotes weight loss.


It's important to note that the choice of weight loss surgery depends on various factors, including your overall health, BMI, medical history, and individual preferences. The decision should be made in consultation with a healthcare professional experienced in bariatric surgery.

If you're considering weight loss surgery, it is crucial to undergo a comprehensive evaluation and discuss the potential risks, benefits, and expected outcomes with a specialized healthcare team, including a bariatric surgeon, dietitian, psychologist, and other relevant professionals. They can guide you in determining the most suitable weight loss surgery based on your individual circumstances and support you throughout the entire procedure.

Is Body Mass Index reliable?


Body Mass Index (BMI) is a commonly used tool to assess weight status and estimate the level of body fat in an individual. However, it has limitations and may not provide a comprehensive picture of an individual's health. 


Here are some key points to consider regarding the reliability of BMI:


  1. Limited assessment of body composition: BMI is calculated based on an individual's weight and height, without considering factors such as muscle mass, bone density, and distribution of fat. As a result, individuals with higher muscle mass or denser bones may have a higher BMI, even if their body fat percentage is relatively low. Similarly, individuals with lower muscle mass and higher body fat may have a normal BMI, despite having an unhealthy level of body fat.
  2. Variation across different populations: BMI cutoffs were initially developed based on studies conducted on predominantly white populations. It may not accurately reflect the health risks associated with weight in individuals from different ethnic backgrounds. For example, some ethnic groups may have a higher risk of obesity-related health conditions at lower BMI levels.
  1. Lack of consideration for fat distribution: The distribution of body fat, particularly central or abdominal obesity, is an important factor in determining health risks. BMI does not take into account where fat is located in the body. Abdominal fat, specifically visceral fat, is associated with a higher risk of cardiovascular disease, diabetes, and other health issues. Therefore, two individuals with the same BMI could have different health risks based on their fat distribution.
  1. Not suitable for athletes and individuals with higher muscle mass: BMI may not accurately assess weight status in athletes or individuals with higher muscle mass. Muscle weighs more than fat, so individuals with significant muscle mass may have a higher BMI, even if they have a low body fat percentage.


Despite these limitations, BMI can still be a useful screening tool at the population level to identify potential weight-related health risks. It's a quick and cost-effective method to assess weight status in large populations. However, for a more comprehensive evaluation of an individual's health, it's important to consider other factors such as body composition, waist circumference, blood pressure, blood lipid levels, blood glucose levels, and individual medical history. Consulting with a healthcare professional, such as a doctor, registered dietitian, or a body composition specialist, can provide a more accurate assessment of an individual's health and guide personalized recommendations for weight management and overall well-being.


How Much Should You Walk Daily According to BMI?

The amount of walking recommended daily does not typically vary based on BMI. Instead, physical activity guidelines generally provide recommendations based on the total amount of moderate-intensity aerobic activity individuals should aim for each week, regardless of their BMI.


According to the World Health Organization (WHO) and other reputable health organizations, adults should aim for at least 150 minutes of moderate-intensity aerobic activity per week. This can be achieved through various forms of exercise, including brisk walking. To break it down, if you aim for 150 minutes of moderate-intensity activity weekly, you can divide it into smaller sessions throughout the week. For example, you could aim for 30 minutes of brisk walking on most days of the week.


It's important to note that these guidelines are general recommendations and can be adjusted based on an individual's fitness level, health status, and personal goals. Some individuals, especially those with specific health conditions or fitness goals, may need to consult with a healthcare professional or exercise specialist to determine appropriate exercise recommendations tailored to their needs. Additionally, it is worth considering that physical activity is just one component of maintaining a healthy lifestyle. It is also important to focus on other aspects of well-being, such as a balanced diet, adequate rest, stress management, and maintaining a healthy weight.


Always listen to your body and consult with a healthcare professional or exercise specialist if you have any specific concerns or questions about incorporating physical activity into your routine based on your BMI or other factors.

Frequently Asked Questions Related to Body Mass Index (BMI)

What is the BMI formula?

The BMI is calculated using the following formula:


BMI = (weight in kilograms) / (height in meters)2

Here's how you can calculate your BMI using the metric system:

  1. Measure your weight in kilograms (kg).
  2. Measure your height in meters (m).
  3. Square your height in meters (height)2.
  4. Divide your weight in kilograms by the squared height in meters (weight / height)2

The resulting value is your BMI. It's a numerical representation of your body weight in relation to your height, and it's used to classify individuals into different weight categories, such as underweight, normal weight, overweight, and various degrees of obesity.

Is BMI different for men and women?

The BMI (Body Mass Index) formula itself is the same for both men and women. It's a simple mathematical calculation based on a person's weight and height. However, when interpreting BMI values, it is important to note that men and women may have different average body compositions. Men and women typically differ in terms of muscle mass, fat distribution, and other physiological factors. As a result, the same BMI value may have slightly different implications for men and women.

What are limitations to BMI calculator?

Age, sex, and muscle mass can impact the relationship between BMI and body fat. In addition, BMI does not differentiate between excess fat, muscle, or bone mass nor provides any indication of fat distribution among people.


Does body shape or body frame size affect BMI?

No, BMI is calculated on the basis of height and weight of the individual and does not take into account the body shape or frame size.

Can BMI tell how much weight to lose?

BMI provides a general idea of whether the individual is underweight, normal weight, or overweight. It does not give any specific guidance about how much weight should be reduced. It is best to consult with a healthcare professional for personalized advice.

How long does it take to reduce BMI?

The time taken by each individual to reduce the BMI varies on factors like the starting weight, diet, exercise, and the overall health. It is majorly important to focus on sustainable, healthy habits rather than the time period.

Can one solely depend on BMI to determine if they need to loose or gain weight?

Body mass index or BMI is not a complete accurate value as it only measures the body weight instead of the excess body fat. BMI is a useful tool to check the health of the individual but not the sole measurement scale.


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